Abstract: Objective To study whether reduction fixation of lesser trochanter influences the stability of prosthesis through biomechanical experiments. Methods Freshly frozen cadaveric femur samples and SQK hip-joint prosthesis were used for normal cement hemiarthroplasty,lesser trochanter fixation,and cement reinforcement,respectively.Vertical migration data were detected when the prosthesis was tested 10 000 times. Results The time-migration curve showed that the vertical migration in 3 groups increased with the number of cycles.The vertical migration value of prosthesis was the smallest for normal cement hemiarthroplasty and the greatest for cement reinforcement at all time points.No statistical difference was found in vertical migration value of prostheses for lesser trochanter fixation and cement reinforcement after they were tested 10 000 cycles.The mean vertical migration value and variation were the smallest for normal cement hemiarthroplasty and the greatest for lesser trochanter fixation and cement reinforcement. Conclusion The vertical migration value of prosthesis is greater for lesser trochanter fixation and cement reinforcement.The vertical migration value and variation of prosthesis are greater for cement enforcement than for lesser trochanter fixation.