MODELING THE WORK OF THE MUSCLES OF THE LOWER EXTREMITY IN CONDITIONS OF FLEXION-ADDUCTION CONTRACTURE OF THE HIP JOINT AND FLEXION-EXTENSION CONTRACTURE OF THE KNEE JOINT

Large joint damage often leads to inability work and disability that requires long-term treatment. The development of osteoarthritis is accompanied by changes in the muscles special rehabilitation measures are needed restore their strength, symmetry load during standing steps walking. Objective. To determine most vulnerable lower extremities conditions hip knee joints using a mathematical model. Methods. Three models were created OpenSim system. Model 1 (normal): extension/flexion — 10°/0°/45°; removal/adduction 5°/0°/12°; rotation 3°/0°/3°, foot turning 5°. 2 with flexion-adduction contracture hip: flexion setup 20°,adduction setting 10°, shortening femur cm. 3: 0/20°/50°. Results. With combined contracture, isometric strength decreases almost 60 %. In case joint, rectus femoris muscle more stretched 3.5 % force extend knee. presence adductor joint,the thigh's thin contractile state, which reduces its 90 this primarily so required our model, 6 extremity due gastrocnemius can lose up 78 5%. contracture,the pelvic stabilizer (m. tensor fasciae latae) decrease 44.4 %, semimembranosus) 54.5 Conclusions. Contractures lead loss limb, negatively affects functioning recovery after arthroplasty.