Comparative analysis of the biomechanical behavior of two different design metaphyseal-fitting short stems using digital image correlation

Table 1 Percentage strain for each prosthesis compared to the control femur and strain comparison for each zone of interest, p-values

Key zone of interest	Implanted Minima S femoral stem		Implanted Trilock BPS femoral stem		Minima S to Trilock BPS (p-value)
Key zone of interest	Percentage strain against controls (%)	Mann–Whitney test against controls (p-value)	Percentage strain against controls (%)	Mann–Whitney test against controls (p-value)	Minima S to Trilock BPS (p-value)
Medial side
M1	68.7	0.001	57.1	0.000	0.029
M2	84.1	0.005	69.2	< 0.0001	< 0.0001
M3	101.0	0.029	89.4	< 0.0001	< 0.0001
M4	102.5	0.529^a	97.8	0.139^a	< 0.0001
M5	99.1	0.459^a	98.2	0.752^a	0.153^a
M6	98.3	0.13^a	96.7	< 0.0001	0.000
M7	106.1	0.001	101.6	0.556^a	0.003
Lateral side
L2	87.5	< 0.0001	79.2	< 0.0001	0.935^a
L3	89.1	< 0.0001	57.8	< 0.0001	< 0.0001
L4	98.2	0.000	82.2	< 0.0001	< 0.0001
L5	98.1	0.043	92.6	0.004	0.002
L6	95.4	0.000	81.2	< 0.0001	< 0.0001
L7	100.3	0.131^a	87.7	< 0.0001	0.006

ISSN: 1475-925X