大腿假肢膝關(guān)節(jié)應(yīng)用課件

1、大腿假肢膝關(guān)節(jié)應(yīng)用 主要的挑戰(zhàn)高位雙截肢骨骼增生截肢長度疤痕增生高位雙截肢高位雙截肢User PreferencesMR ActuatorMR致動裝置 Resistive Force 阻力反應(yīng)(1000Hz)Microprocessor Sensory (1000Hz)感應(yīng)裝置（1000赫茲）Knee Angle膝關(guān)節(jié)角度Velocity速率Forces力Stance Control支撐期控制Ground reaction force anterior to knee.Initial ContactHamstring activity is minimalKnee extensors acti

2、ve Knee in extension.足跟觸地地面反作用力作用在膝關(guān)節(jié)前面膝伸展Hip extensors active髖伸肌收縮膝關(guān)節(jié)伸肌收縮腘肌收縮小1Loading Response Knee flexion moment created to 15反作用力 Ground reaction force moves posterior to knee.地面反作用力逐步前移接近膝關(guān)節(jié)膝關(guān)節(jié)屈曲152Eccentric contraction of knee extensors.Loading ResponseProvides shock absorption.Critical in es

3、tablishment of stability.Most powerful contraction.膝伸肌收縮狀況強(qiáng)有力的收縮確保膝關(guān)節(jié)的穩(wěn)定性提供緩沖反作用力Increased COMFORT and EASE of walkingKnee most closely mimics TRUE knee motion by allowing 15 of flexion.Stance flexion bumper mimics eccentric contraction of quadriceps.支撐期屈曲緩沖器模仿股四頭肌收縮膝關(guān)節(jié)最大程度的模仿屈曲15提高行走的舒適性和安全性Late St

4、ancePre-Swing預(yù)擺動期重心線逐步移到腳的MP關(guān)節(jié)股直肌限制腳跟提升膝關(guān)節(jié)被動屈曲40 腳的準(zhǔn)備蹬離允許脛骨向前滾動Rectus Femoris limits heel rise.40 passive knee flexionFoot destabilizes and allows tibia to roll forward.COP moves over MP joint of foot.3Initial Swing60 knee flexion will be required for limb to clear floor in swing.Equinus foot positi

5、on creates limb LENGTHENING.初始擺動期蹬離期前的腳位置，使小腿“加長”膝關(guān)節(jié)需要60度的屈曲，可以保證膝關(guān)節(jié)離開地面Rapid hip flexion required, hamstring and rectus femoris action.腘繩肌和股直肌的收縮使髖關(guān)節(jié)迅速屈曲4Swing Phase擺動期Terminal SwingHamstrings decelerate the hip.Momentum and quadriceps action required to lift weight of tibia and foot for full extension.Approach 30 hip flexion.擺動末期髖關(guān)節(jié)約屈曲30 股四頭肌收縮克服了脛骨和腳的重量，使膝關(guān)節(jié)伸展 腘繩肌使髖關(guān)節(jié)減速 5支撐期擺動期124&53Hip extensors active髖伸肌收縮 Ground reaction force moves posterior to knee地面反作用力逐步前移接近膝關(guān)節(jié)Rapid hip flexion required, hamstring and rectus femoris action腘繩肌和股直肌的收縮使髖關(guān)節(jié)迅速屈曲Ankle plantarflexion and p