Abstract
Relevance of the topic. In patients with cerebral palsy, knee flexion contractures are often the result of spasticity and tenogenic changes. For the correct diagnosis of these contractures and the selection of individual treatment tactics, especially when choosing a minimally invasive surgical method (aponeurotic lengthening), special clinical tests - rectus femoris, hamstring and adductor tests - are of great importance. The rectus femoris test is performed with the patient lying on his stomach, with the hip passively flexed, if the knee joint does not pass into passive flexion or the lumbar region is raised - this indicates the presence of tenogenic shortening of the rectus femoris.