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Patient-Specific Design and Biomechanical Evaluation of a Novel Bipolar Femoral hemi-knee prosthesis

Journal of Bionic Engineering 2014年第2期11卷 259-267页

作者： Qin Lian Dichen Li Zhongmin Jin ZhenWang Yuhan Sun State Key Lab for Manufacturing System Engineering Xi' an Jiaotong University Xi' an 710049 P. R. China Institute of Medical and Biological Engineering University of Leeds Leeds LS2 9JT UK Institute of Orthopedic Surgery Fourth Military Medical University Xi'an 710032 P. R. China

While total knee replacement is successful, hemiarthroplasty is necessary for some young, obese and active patients who are especially not suitable for unicompartmental or total knee prostheses. hemiarthroplasty also provides an opportunity for children with bone tumors. The design ofhemiarthroplasty should be patient-specific to reduce contact stress and friction as well as instability, compared to conventional hemi-knee prosthesis. A novel bipolar hemi-knee prosthesis with two flexion stages was developed according to a healthy male＇s knee morphological profile. The motion mode of the bipolar hemi-knee prosthesis was observed through roentgenoscopy in vitro experiment. The biomechanical properties in one gait cycle were evaluated though finite element simulation. The bipolar hemi-knee prosthesis was found to produce knee flexion at two stages through X-ray images. The first stage is the motion from upright posture to a specified 60~ flexion, followed by the second stage of motion subsequently to deep flexion. The finite element simulation results also show that the designed hemi-knee prosthesis has the ability to reduce stresses on the joint contact surfaces. Therefore, it is possible for the bipolar hemi-knee prosthesis to provide better biotribological performances because it can reduce stresses and potentially wear on the opposing contacting surface during a gait cycle, orovidin~ a t^romisin~ treatment strate^v in future Joint renair znd renlneement

关键词： hemi knee prosthesis custom-design bipolar mechanism finite element analysis biomechanics

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