Abstract:

Objective　To study the biomechanical stability of the comminuted intertrochanic fracture treated with cemented standard femoral stem prosthesis.　Methods　18 cadaveric femurs were selected in this study and divided into three groups randomly as FHR, DHS and control group. The FHR group(A)(n=6) was simulated as comminuted intertrochanic fractures as four parts which were treated with cemented femoral prosthesis following standard hemiarthroplasty procedure and the four parts fractures in FHR group were fixed by wires additionally. The DHS group (B) (n=6) was also simulated as comminuted intertrochanic fractures as four parts which were treated with DHS internal fixation systems. The control group (C) (n=6) was raw cadaveric femur. The specimens were tested mechanically by universal testing machine through vertical and rotational loading. The displacement of loading were recorded and analyzed. 　Results　Vertical loading tests: No significant differences of displacement were found between group A and C either in vertical loading from 100N to 1000N or in rotational loading with torque of 8Nm. There was statistically significant difference between group B and C, also group A and B in vertical loading. In rotational loading test, there was statistically significant difference between group B and C, and no significant difference between group A and B.　Conclusions　The use of cemented standard femoral stem prosthesis is biomechanically acceptable in the treatment of comminuted intertrochanic fractures.

Key words: Intertrochanic fracture, Hemiarthroplaty, Biomechanics