The role of bone marrow on the mechanical properties of trabecular bone: a systematic review
BioMedical Engineering OnLine volume 21, Article number: 80 (2022)
Accurate evaluation of the mechanical properties of trabecular bone is important, in which the internal bone marrow plays an important role. The aim of this systematic review is to investigate the roles of bone marrow on the mechanical properties of trabecular bone to better support clinical work and laboratory research.
A systematic review of the literature published up to June 2022 regarding the role of bone marrow on the mechanical properties of trabecular bone was performed, using PubMed and Web of Science databases. The journal language was limited to English. A total of 431 articles were selected from PubMed (n = 186), Web of Science (n = 244) databases, and other sources (n = 1).
After checking, 38 articles were finally included in this study. Among them, 27 articles discussed the subject regarding the hydraulic stiffening of trabecular bone due to the presence of bone marrow. Nine of them investigated the effects of bone marrow on compression tests with different settings, i.e., in vitro experiments under unconfined and confined conditions, and computer model simulations. Relatively few controlled studies reported the influence of bone marrow on the shear properties of trabecular bone.
Bone marrow plays a non-neglectable role in the mechanical properties of trabecular bone, its contribution varies depending on the different loading types and test settings. To obtain the mechanical properties of trabecular bone comprehensively and accurately, the solid matrix (trabeculae) and fluid-like component (bone marrow) should be considered in parallel rather than tested separately.
Trabecular bone is a hierarchical, spongy and porous structure, located mainly at the ends of the long bones (tibia, femur), within irregular shared bones (vertebrae, sacrum) and flat bones (skull, ribs) . At the macrostructural scale, the structure consists of trabecular struts and plates that provide a stiff framework for cellular spaces, filled with bone marrow and cells in vivo .
Bone marrow, which is divided into red and yellow marrow, is a semi-solid soft substance located within the central cavity of long axial bone and the pore spaces of trabecular bone. Yellow (fatty) marrow is the main tissue filling trabecular bone in adult humans, and the composition of bone marrow varies greatly with anatomical site and age [3, 4]. Previous studies have reported that fat content increases in the process of bone loss such as osteoporosis or age-related osteopenia [5,6,7,8]. The characteristics of bone marrow have been investigated in previous publications. In a study by Davis et al. , the viscosity of bone marrow was measured. The data revealed that the specimens containing red components behaved like a non-Newtonian fluid in the range of 36–38 ℃, while yellow marrow without any red components behaved like a Newtonian fluid at 23 and 36 ℃. Jansen et al.  found that bone marrow is elastic and exhibits a large heterogeneity in both intra- and inter-specimens, with the effective elastic modulus at a physiological temperature ranging from 0.25 to 24.7 kPa. This raises a scientific question, does the presence of bone marrow, as part of the internal structure of trabecular bone, affect its mechanical properties? In other words, when accurately evaluating the mechanical properties of trabecular bone, is it possible to neglect the role of bone marrow?
Concerning this subject, previous studies have been conducted not only with in vitro experiments [11,12,13,14], but also with computer model simulations [15,16,17]. However, in practice, it is hard to quantify the contribution of bone marrow to the mechanical behavior of trabecular bone since it is highly reliant on the experimental setup and conditions [13, 14]. To date, there is a lack of comprehensive research on this topic. Several studies have investigated the mechanical properties of trabecular bone, focusing only on the solid matrix, and neglecting the role of bone marrow [18,19,20].
Therefore, a systematic review on this subject is necessary because it is valuable not only for obtaining more accurate in vitro experimental results, but also for building more accurate computer models (e.g., finite element models, FEMs) of trabecular bone. To be specific, this study aims to answer two scientific questions: (i) whether the presence of bone marrow would cause hydraulic stiffening of trabecular bone? (ii) What are the differences in the role of bone marrow under various mechanical test conditions of trabecular bone?
Description of studies
Totally, 431 articles were found through PubMed (n = 186), Web of Science databases (n = 244), and other sources (n = 1). After removing duplicates, 389 studies were potentially eligible. Following the screening of titles, abstracts, and full-text articles, 38 articles were finally included in our study. Details are shown in Figs. 1, 2, and Additional file 1: Table S1.
Risk of bias
All included articles (n = 38) were completed for quality assessment, and details are shown in Table 1. Most of the studies provided detailed information about the research framework. Thirty-seven clearly described the background, purpose, and objectives of the study in the abstract. No study included the sample size calculation, and only two studies addressed the missing data [14, 21]. Furthermore, the large heterogeneity and lack of randomized controlled trials made it impossible to carry out a meta-analysis.
Table 2 summarizes the characteristics of the 38 studies. Among them, 27 articles addressed the subject regarding hydraulic stiffening effect of bone marrow, including in vitro experiments and computer model simulations [17, 22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47]. Nine publications investigated the role of bone marrow in compression tests under different settings, i.e., in vitro experiments under unconfined and confined conditions, computer model simulations [11,12,13,14,15,16, 21, 48, 49]. Relatively few controlled studies investigated the effect of bone marrow on the shear properties of trabecular bone [50, 51].
Quality assessments questions
1. Did the abstract provide an informative and balanced summary of what was done and what was found?
2. Was the scientific background and rationale for the reported investigation explained?
3. Were the objectives of the study clearly stated?
4. Did the study clearly describe the methodology/protocol of studies which includes the setting, the sources, and sizes of samples included (the size is only applicable for standardized samples)?
5. Did the characteristics of bone samples included in the study clearly described, including density, volume fraction, or porosity?
6–1. Did the exposures, potential confounders, and allocation scheme for the samples have been clearly described (applicable to in vitro experiments)?
6–2. Did the computer model provide a clear statement of the source of stimulation parameters with appropriate reasons or references (applicable to computer model simulation studies)?
7. Was the calculation of study size/sample size reported?
8. Were the statistical tests or data analysis methods used to access the main outcomes described in detail?
9. Did any missing data address in the study?
10. Did the number of samples included in the study have been reported in detail?
11. Did the study indicate basic information about bone samples, including age, gender, species origin, and anatomical site (gender is only applicable to human bone samples)?
12. Were the main findings of the study clearly described?
13. Did the study summarize the key results with reference to study objectives?
14. Were the limitations of the study discussed, taking into account sources of potential bias?
15. Did the study interpret overall results considering objectives, the multiplicity of analyses and results from similar studies/relevant evidence?
16. Did the study state the source of funding or the role of funders for the present study?
Hydraulic stiffening of bone marrow
Currently, both in vitro experiments and computer model simulations have been used to investigate the hydraulic stiffening of bone marrow. Comprehensive knowledge of this subject may enhance the understanding of important orthopedic problems.
In vitro experiments
Theoretically, the deformation of the pores under external forces would induce the motion of the fluid-like marrow, resulting in pressure and velocity gradients [22, 40]. Because of diverse experimental setups and conditions, the impact of hydraulic stiffening and strengthening by bone marrow has proven contentious in practice [17, 23,24,25,26,27, 38, 42,43,44,45,46].
Under moderate and physiological loading conditions (i.e., normal walking), Swanson and Freeman  found that trabecular bone is not hydraulically strengthened by bone marrow. In line with this result, Pugh and co-workers  compared the mechanical properties of fresh wet and defatted bone specimens under the condition of small amplitude mechanical excitation (100 to 30000 Hz). According to the findings, the fluid in the intertrabecular spaces had no influence on the dynamic mechanical behavior. Bryant [28, 41] also found that hydraulic strengthening and viscous effects do not appear to occur in long bones subjected to non-destructive compression loads. They argued that when there is little or no volume change, as well as no significant movement between the marrow and the adjacent trabecular bone, the hydraulic strengthening and viscous resistance by the marrow may be insignificant.
Apart from the tests with small volume deformations, it was observed in a study by Kazarian et al.  that the mechanical behavior of the vertebral centrum was dependent on the strain rate. They explained that this was due to hydraulic strengthening caused by the internal marrow at the higher strain rates. In agreement with this result, the strength of trabecular bone increases significantly when testing at high strain rates in the range of 102–103 s−1, according to Pilcher et al. . However, they did not consider the compressive loading of bone marrow to be an important effect. They explained that this is because the trabecular bone does not have enough time to occur due to the rapidly increasing applied stress, resulting in a different failure mechanism, i.e., higher failure stress and lower failure strain. Actually, not only for the solid structure of trabecular bone (trabeculae), but also for the internal fluid-like bone marrow, where the enclosed fluid would directly transmit a part of the load (25% of the applied load) when the trabecular bone deforms under external forces, according to the findings by Simkin et al.  and Deligianni et al. . In addition, Ochoa et al.  investigated the influence of intraosseous fluid on the load capability of the intact canine femoral heads under in vitro conditions. The results revealed that intraosseous fluid within the femoral head provides a significant portion of the stiffness, up to 30% of the initial stress. Ochoa et al.  also performed the same experiment under in vivo conditions. In corresponds to similar results in vitro, intraosseous fluid within the femoral head provides a significant portion of the total stiffness, i.e., an average of 19% of the load-bearing capabilities. They explained that this difference (30% in vitro vs. 19% in vivo) is due to variations in temperature and rheological properties of bone marrow. The studies by Ochoa et al.  and Nuccion et al.  also support this view that the mechanical stiffness of the femoral head would be affected when the intraosseous fluid compartment is disrupted (a 33% reduction by Ochoa et al. and a 40% decrease by Nuccion et al.). Furthermore, under more high-speed loading condition (2500 mm/s), a study by Ochia et al.  indicated that the high fluid flow caused by bone marrow could result in the bending or breaking of trabeculae, which may damage trabeculae of the vertebral body.
Computer model simulations
Apart from in vitro experiments, the computer model simulations such as FE, poro-elastic and viscoelastic models have also been utilized to investigate the hydraulic stiffening of trabecular bone caused by the presence of bone marrow [17, 27, 32,33,34,35,36,37, 39, 47]. A study by Metzger and co-workers  has reported that trabecular bone was simulated by different models (linear elastic, neo-Hookean, viscoelastic, and power-law fluid constitutive models) with significant variations in test results, in which the bone marrow as a fluid plays an important role. According to Sandino et al. , for trabecular bone, the fluid flow mechanism induced by bone marrow is a non-negligible role in the building of trabecular bone models and needs to be taken into account. Kasra et al.  also indicated that hydraulic stiffening occurs once the applied loading rate is higher than the diffusion rate of pore fluid. Consistent with this view, in other studies [30, 31], the enhancement of hydraulic stiffness was observed at faster loading strains. Pense and co-workers  also concluded that there is a significant strain-rate dependence of poro-elastic hydraulic stiffening in bone tissue due to the fluid in the trabecular bone pores. A study by Lim and co-workers  claimed that trabecular bone is poro-elastic and the fluid effect on the mechanical behavior at the continuum level is significant.
Investigation of hydraulic stiffening, not only in normal bones, but also provides a useful tool for understanding of the abnormal physiological in trabecular bone. For trabecular bone with aging or osteoporosis, the alternation of the microstructure also results in changes in its permeability, and in an exponential relationship . There is no doubt that this alternation in permeability would affect the fluid flow and pore pressure generation significantly. This hypothesis was also confirmed in previous studies [36, 39]. According to Sandino et al. , when the porosity of trabecular bone increases by 30%, the average stress and strain in the bone tissue may reduce 50% and the fluid velocity in the marrow phase 88%. Also, Birmingham et al.  found that lower bone mass could increase the shear stress generated within the marrow, meanwhile, a decrease in bone marrow viscosity reduces the generated shear stress.
In addition to that, concerning the question of whether physiological loading (normal walking) causes hydraulic stiffening of the trabecular bone. The simulation results by Rabiatul et al.  indicated that, during normal walking loading, the presence of bone marrow may resist a certain extent of applied force, which caused the apparent stiffness of the trabecular structure. In contrast to this view, Haider et al.  used a patient-specific FEM to determine the effects of hydraulic strengthening on the structural response of the proximal femur under a realistic impact load. The results showed that the presence of bone marrow results in little hydraulic strengthening effect, i.e., 2% of the total hydraulic stress.
Compression tests are used to determine how a material reacts when compressed by measuring basic parameters including elastic modulus, maximum compressive stress, average compressive stress, yield stress, toughness, etc. [13, 14]. Previous studies have investigated the role of bone marrow on the compression properties of trabecular bone, both in vitro experiments and computer model simulations.
In vitro experiments under unconfined conditions
According to the findings by Halgrin et al. , under unconfined uniaxial compression test conditions, bone marrow contributes to a reduction in the mechanical properties of trabecular bone, i.e., 26% for elastic modulus, 38% for maximum compressive stress, and 33% for average stress. They explained that the viscous interstitial fluid creates transverse pressure and additional local load on the trabeculae during flow, increasing the transverse strain applied to the trabecula, causing the trabecular network to prematurely collapse. Consistent with Halgrin et al. , Bravo et al.  found that the specimens with the marrow removed and replaced with saline exhibited superior mechanical characteristics, i.e., 37% for elastic modulus, 48% for 0.2% yield stress, 39% for maximum compressive stress, 54% for strain at maximum stress, and 300% for toughness. They explained that during the unconfined compression testing, the vertical movement of bone marrow caused the fluid to expand horizontally, bending the trabeculae and decreasing the apparent strength. On another hand, during the deformation, the higher viscosity of bone marrow provides a greater barrier to fluid flow, leading to greater stress concertation alone the trabeculae and early breakdown of the trabecular structure. In an earlier study by Linde and co-workers , defatted trabecular bone specimens were shown to enhance stiffness by 30% while decreasing viscoelastic dissipation by 50%. They attributed the variation in mechanical properties of specimens with and without bone marrow to drying, and rehydration in saline for more than 3 h would diminish the discrepancies. Indeed, drying or dehydration of trabecular bone specimens can lead to changes in mechanical properties. However, to avoid dehydration, specimens in the experiments by Halgrin et al.  and Bravo et al.  were maintained in saline throughout all preparation processes. From our perspective, the presence of bone marrow, apart from the potential effect of dehydration, still plays a significant role in affecting the mechanical properties of trabecular bone during unconfined compression testing.
In vitro experiments under confined conditions
In both confined and unconfined conditions, Chaari et al.  conducted quasi-static compression tests. According to the findings, there was no significant difference in elastic properties, but bone marrow may increase bone strength at higher strain (more than 30%). Moreover, according to the results by Cater and Hayes , at a very high strain rate (10.0 per second), the presence of bone marrow enhanced the strength, modulus, and energy absorption of trabecular bone specimens. This is due to the constricted viscous flow of bone marrow through the platen rather than the flow through the pores of the trabecular bone. Hence, the presence of bone marrow affects the mechanical properties of trabecular bone only in confined compression tests with high strains or high strain rates.
Computer model simulations
A study by Simon et al.  revealed that the fluid phase contained in FEMs plays an important role in the mechanical response of spinal motion segments. Halgrin et al.  simulated the deformation of trabecular bone specimens using a FEM and reported that the fluid pressure caused by the bone marrow would reduce the maximum compressive stress. They claimed that the specimens with bone marrow had lower global axial stress and strain before collapse compared to specimens without bone marrow. The FEM simulations by Chen et al.  and Ma et al.  were both conducted under unconstrained conditions in the X and Y directions. The simulation results by Chen and co-workers  demonstrated that trabecular models stuffed with marrow fat have less maximum stress (3–9%) and larger average stress in volume (9–56%) than that of models with only trabeculae. They stated that the presence of marrow fat could improve the strength of trabecular bone by balancing stress and energy distribution. However, the FEM simulation results by Ma et al.  showed that the trabecular bone with marrow fat suffered larger apparent stress and compressive stress than the model with trabecular bone only, i.e., 18.81% for maximum compressive stress and 10.25% for average stress. They concluded that the bone marrow augmented the stress but balances the distribution of stress. The trabecular bone without marrow is more likely to fracture under mechanical loading due to unbalanced deformation. Moreover, a study by Laouira et al.  demonstrated that the confined marrow plays a non-negligible role in the mechanical properties of trabecular bone, i.e., 22.3% increase in maximum von Mises stress, 12.4% increase in maximum shear stress, 5.8% reduction in maximal strain. They explained that this is due to the increase in marrow pressure, which acts like a damper between the trabeculae, slowing down their deformation. Furthermore, the flow of bone marrow slows down the velocity of deformation of the solid trabeculae when an external force is applied.
Specimens from trabecular bone are typically difficult to machine since the aged trabecular bone in humans is so fragile . To date, few studies have investigated the effect of bone marrow on the shear properties of trabecular bone .
Nevertheless, some potential evidence can be found by summarizing the previous literature [28, 50]. Mitton et al.  measured the shear strength of trabecular bone specimens with and without physiological saline. The results showed that shear testing in a physiological saline bath at 37 ℃ reduced the strength from 32.5 to 37.5% compared to testing under “standard” conditions (at room temperature, 22–25 ℃, in the air). They claimed that friction may be a non-negligible factor. The yellow marrow, being a Newtonian fluid, has an approximately 10 times higher viscosity than that of water at 37 ℃ . Hence, it is worth considering whether the presence of a highly viscous fluid would produce a non-negligible internal fraction on the shear properties of trabecular bone.
However, a controlled trial by Kasra and Grynpas  revealed a different view. The sheep lumbar vertebrae were used to test the shear properties of trabecular bone at different strain rates. According to the findings, the presence of bone marrow had no influence on shear modulus and strength at both low and high strain rates. In compression tests, the confined test condition and high loading rate cause the entrapped marrow to resist the compressive force. Contrarily, during torsion or shear loading, the bone volume of the tested specimen remains relatively unchanged and the stiffening effect caused by the friction between bone and marrow is much smaller . It is reasonable to assume that the effect of bone marrow on shear properties is much less than that of compression properties. Certainly, this view needs to be verified by further research in the future.
The role of bone marrow on the mechanical properties of trabecular bone under different loading conditions was systematically reviewed. According to our results, the solid matrix (trabeculae) and fluid-like component (bone marrow) should be considered in parallel rather than tested separately. Cleaning or replacing the marrow with other solutions (e.g., physiological saline) in the in-trabecular space would change the mechanical behavior of trabecular bone. Undoubtedly, this information is important for the prevention and treatment of degenerative bone diseases (e.g., osteoporosis), and fragility fracture, as well as building more accurate in vitro models of trabecula bone.
Biomechanical characteristics of bone marrow
Bone marrow is generally divided into two types, red marrow, which has a hematopoietic function, and yellow marrow, which is rich in fat. In healthy adults above the age of 25 years, yellow marrow accounts for a major part of the bone marrow (70% of adult bone marrow volume) . On the contrary, red marrow is predominant in early childhood. However, the difficult harvesting of red marrow limits the ability to isolate and test its mechanical characteristics by conventional approaches . As a result, more biomechanical studies on bone marrow have focused on yellow marrow. For instance, Jansen et al.  used three different techniques (rheology, indentation, and cavitation) to evaluate the mechanics of intact yellow porcine bone marrow. The results indicated that bone marrow is elastic, with an effective Young’s modulus of 0.25–24.7 kPa at physiological temperature; moreover, there is a high degree of heterogeneity in both intra- and inter-specimens. Actually, in vivo, the composition (adipose tissue fraction) [8, 53] and mechanical characteristics (e.g., viscosity, dynamic moduli) [10, 28] of yellow marrow present dynamic alternations with age and temperature. In turn, the alternations in the composition and mechanical characteristics may further affect the role of bone marrow on the mechanical properties of trabecular bone. A study by Fazeli et al.  concluded that an inverse association between marrow adipose tissue and measures of bone strength.
In addition, the heterogeneity of bone marrow and surrounding cortical bone is also a challenge for researchers interested in conducting mechanical studies. The structure and histology of bone marrow are governed by numerous variables related to specimen collection and processing . Also, previous studies used bone marrow extracted from the medullary cavity for histological and mechanical properties, but this method is destructive and there is a gap with the properties of intact bone marrow [10, 28, 54, 55]. Taken together, the mechanical characteristics demonstrated by bone marrow at the organ level are a complex and dynamic behavior. It is still a challenging issue to investigate the mechanical characteristics of the bone marrow itself comprehensively and accurately.
Hydraulic characteristics of fluid–solid interaction
The hydraulic nature of this fluid–solid interaction has a potential impact on the mechanics of trabecular bone, particularly in intact bone where the boundary condition has not been disrupted [25, 26, 49]. As far as we know, no previous systematic review has been carried out upon the effect of bone marrow on the mechanical properties of trabecular bone. In practice, understanding the fluid flow, changes, and hydraulic stiffening mechanism of bone marrow is of potential clinical significance. For example, the impact of viscous constituents during mechanical loading is referred to as hydraulic stiffening of trabecular bone, which is a more realistic simulation for physiological falls . Not only that, hydraulic resistance and permeability are also believed to be potentially associated with high-speed spinal injuries such as burst fractures [29, 56]. Currently, based on the above findings [17, 24,25,26, 28, 30,31,32], we may reasonably conclude that the hydraulic stiffening and strengthening of trabecular bone associated with bone marrow is minimal or even neglectable at small strains (i.e., non-destructive loading). The presence of bone marrow, however, plays a significant role in the hydraulic stiffening of trabecular bone with regard to load capacity at high strain rates and sufficient volume changes. In vivo, the overall stiffness of trabecular bone is actually a combination of the material properties of the porous solid substrate and enclosed fluid.
The effect of bone marrow on compressive loading
Experiments addressing the mechanical properties of trabecular bone are often conducted on the cadaveric bone to reflect in vivo performance. To date, the majority of investigations have studied the effect of bone marrow on compressive loading, in both unconfined and confined situations [11, 13, 14, 57]. Under the unconfined condition, bone marrow can flow freely when subjected to compressive loading. Viscous bone marrow creates transverse pressure and extra local stress on the trabeculae during flow, which can cause a reduction in the mechanical properties of trabecular bone [13, 14]. However, the FEM simulation by Chen et al.  claimed that marrow fat can balance the load distribution of bone tissue, potentially reducing deformation under compressive stresses. Although the application of FEM can mitigate the limitations of existing in vitro experiments by taking advantage of reproducibility and repeatability. The drawbacks of FEM need to be carefully considered, i.e., bone marrow is simplified , bone matrix and marrow are regarded as solid homogeneous materials with consistent Young’s modulus . So, the simulation results by FEMs are able to provide us with trends and references but cannot replace in vitro experiments. In contrast to the unconfined condition, fluid flow is prevented in the confined test. Based on the studies mentioned above [11, 12, 48], it is reasonable to conclude that bone marrow contributes to the mechanical properties of trabecular bone, especially at high strain rates and sufficient volume changes.
The effect of bone marrow on other loads
Regarding the role of bone marrow on other mechanical loads, such as shear, tensile, and bending tests, few controlled studies have investigated this subject. As far as we know, only the study by Kasra and Grynpas  directly investigated the effect of bone marrow on the shear properties of trabecular bone by in vitro experiments. Because there is minimal change in bone volume and any stiffening impact is generated by considerably lower frictional forces between bone matrix and bone marrow, the presence of bone marrow had no significant influence on the shear modulus and strength of trabecular bone. Nevertheless, this view still needs to be validated by further studies in the future.
This systematic review has several limitations. First, not all studies were summarized in our review, which is a limitation of all systematic reviews. To overcome this problem, the “similar articles” option of PubMed and references of primary articles and reviews were used to further expand the search. Second, most studies related to the effect of bone marrow are on compressive loading, lacking direct compared studies on shear and other tests. However, reasonable assumptions have been proposed based on other relevant evidence from previous research. We believe that this review paper could shed new light on the knowledge gained so far, the drawbacks of existing literature, and future directions.
To address the mechanical properties of trabecular bone, the role of interstitial fluid should be included in the analyses. In the confined or intact bone compression tests, hydraulic stiffening and strengthening of trabecular bone are associated with the presence of bone marrow, especially at high strain rates and sufficient volume changes. While in the unconfined compression tests, the free flow of viscous marrow under external forces induces the transverse pressure and extra local loading on the trabeculae. Bone marrow has a much smaller effect on shear properties than on compression properties since the bone volume of the tested specimen remains relatively unchanged. In shear and other tests, the potential role of bone marrow needs to be investigated by further studies in the future.
The PRISMA (Preferred Reporting Items for Systematic review and Mata analysis) guidelines  were used to conduct a systematic review of the literature to find all relevant studies. Ethical approval was not required since this review did not include the processing of individual patient data.
Using PubMed and Web of Science databases, a comprehensive review of the literature published up to June 2022 related to the role of bone marrow on the mechanical properties of trabecular bone was undertaken. The references of primary articles and reviews were checked to avoid missing relevant papers. The “similar article” option of PubMed was also used to further expand the search.
Two reviews (F.W. and L.Z.) conducted an independent search. The following keywords were used to search from PubMed and Web of Science databases. In PubMed, the terms were performed for searching: (1) “(marrow [Title])” AND “(cancellous OR trabecular OR spongy)” AND “(mechanical OR compress* OR tens* OR shear* OR bending)”; (2) “(mechanical stimuli) OR (permeability) OR (poro-viscoelastic)” AND “(trabecular bone [Title])” OR “(cancellous bone [Title])” OR “(spongy bone [Title])” AND “(finite element [Title])”; (3) “(hydraulic [Title]) OR (boundary conditions [Title])” AND “(trabecular bone) OR (cancellous bone) OR (spongy bone) OR (fracture strength) [Title])”. In Web of Science, the terms: (1) “(marrow) AND (trabecular OR cancellous OR spongy) [Title] AND (mechanical OR compress* OR tens* OR shear* OR bending)”; (2) “(mechanical stimuli) OR (permeability) OR (poro-viscoelastic)” AND “(trabecular bone [Title])” OR “(cancellous bone [Title])” OR “(spongy bone [Title])” AND “(finite element [Title])”; (3) “(hydraulic [Title]) OR (boundary conditions [Title])” AND “(trabecular bone) OR (cancellous bone) OR (spongy bone) OR (fracture strength) [Title])” were used for literature search. The journal language was limited to English. In the Web of Science database, document types were set to “articles”. Following the removal of duplicates, reviewers scanned the search results by titles and abstracts. After identifying potentially relevant publications, full-text articles were reviewed and downloaded in accordance with the inclusion and exclusion criteria. Any disagreements between the two authors were referred to a third independent author to be discussed. The detailed search strategy is shown in Fig. 1.
Inclusion and exclusion criteria
The inclusion criteria for this study were as follows: (a) in vitro mechanical tests of trabecular bone related to bone marrow; (b) studies on computer model simulations of trabecular bone associated with bone marrow; (c) studies on hydraulic stiffening of bone marrow. The exclusion criteria were: (a) non-English and full-text articles are unavailable; (b) studies of bones with computer models without involving the role of bone marrow; (c) studies were limited to the solid trabeculae; (d) studies on bone marrow lesion or adiposity; (e) imaging studies on bone and bone marrow; (f) studies on the bone mechanical environment.
Data extraction and analysis
Data were extracted and recorded separately by two authors (F.W. and L.Z.) using spreadsheet software (Excel for Mac 2016, version 16.2.9, Microsoft, Redmond, WA, USA). Experimental methods, authors and year of publication, journal of publication, types and numbers of specimens, gender and age of specimens, anatomical sites, main findings or summaries were all presented.
The STROBE (Strengthening the Reporting of Observational Studies in Epidemiology) criteria were used to assess the risk of bias for the studies included in this review . Of these, 16 items were selected to identify potential sources of bias related to the scope and objectives of our review for reporting, referring to a published article . The checklist includes 6 components: abstract (item 1), introduction (items 2–3), methodology (items 4–9), results (items 10–12), discussion (items 13–15), and other information (item 16). All included articles were evaluated independently by two authors (F.W., and L.Z.). Disagreements were documented by discussion.
Availability of data and materials
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Finite element model
Preferred reporting items for systematic review and meta-analysis
Strengthening the reporting of observational studies in Epidemiology
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Wang, F., Metzner, F., Osterhoff, G. et al. The role of bone marrow on the mechanical properties of trabecular bone: a systematic review. BioMed Eng OnLine 21, 80 (2022). https://doi.org/10.1186/s12938-022-01051-1