In vitro load test of biological prosthesis replacement after partial resection of femoral head / 中华创伤杂志

ABSTRACT

Objective To investigate effect of the biological prosthesis on load properties of the proximal femur after hemiarthroplasty with partial resection of the femoral head in order to assess stability of the prosthetic implant.Methods Twenty-four young fresh normal femur (with preservation of femoral head) specimens were assigned to prosthesis group (n =8),control group (n =8) and fatigue group (n =8).Specimens in prosthesis group underwent artificial femoral head replacement using self-designed prostheses.Stress at the femoral head with the model standing on one leg was performed.Biomechanical machine was used to detect the difference of load-stress and load-displacement before and after femoral head replacement under the load of 2000 N.Detection points included lateral superior base of femoral neck (A),medial side of lesser trochanter of femur (B),and inferior side of greater trochanter of femur (C).Results At the load of 2 000 N,the load-stress at inferior side of greater trochanter of femur and medial side of lesser trochanter of femur revealed no significance differences between the normal femur and femur with artificial femoral head replacement (P ＞ 0.05),while the difference was significant at lateral superior base of femoral neck (P ＜ 0.05).There were no significant differences of load-stress at A,B,and C points among fatigue group,prosthesis group and control group (P ＞ 0.05).Conclusion After partial femoral head replacement,the biological prosthesis is effective in maintenance of the normal stress transfer in the proximal femur.