Sit-to-stand Biomechanics after Tumor-type Knee Arthroplasty
1.State Key Laboratory for Manufacturing System Engineering，School of Mechanical Engineering，Xi’an Jiaotong University
2.Department of Joint Surgery，Honghui Hospital，Xi’an Jiaotong University
Objective To study the biomechanical characteristics of sit-to-stand after tumor-type knee arthroplasty and explore the strategies of personalized/individual rehabilitation and the pre-protection method for the healthy limbs.Methods The gaits were collected on the sit-to-stand movement in 3 stand-up way and 5 seat height，the completion time of STS，knee flexion angle，symmetry of the ground reaction force and the force situation of the replacement side and contralateral side were respectively evaluated.Results With hand on armrest，hands akimbo，hand on 720 mm desktop，patients after tumor-type knee arthroplasty (the experimental group) spend 5.6 seconds，2.5 seconds and 4.6 seconds，while patients spend 2.2 seconds，3.0 seconds and 3.6 seconds in control group.The difference was statistically significant in hand on armrest (P＜0.05).The symmetry of ground reaction force in the sit-to-stand movement was between 0.5 to 1.0.Conclusion Six months after tumor-type knee arthroplasty，the healthy side was still the mainstay on the sit-to-stand movement.The STS showed asymmetry.After operation，the early use of double lower extremity personalized orthosis，brace or personalized orthopedic insoles may promote effective rehabilitation of knee function and pre-protective effects of healthy side.In the process of rehabilitation，sympathetic rehabilitation strategies should be strictly implemented after surgery.
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