Modeling the posture of a cerebral palsy patient with hamstring syndrome after surgical correction by the Zhuravlev procedure

Cerebral palsy patients with hamstring muscle spasticity are characterized by a higher tension of posterior two-joint muscles of a thigh. The upright posture of such patients takes the Z-shaped form. The Eggers operation and the tendoplastic operation by Zhuravlev help the limbs to straighten. In this paper a mathematical model of the patient posture after a Zhuravlev operation is proposed. The numerical results obtained show that a patient underwent such an operation can keep the upright posture even with a higher tonus of the rectus muscle of the thigh. This is impossible for a patient after an Eggers operation.