[Treatment concepts in knee malposition within the scope of primary neurologic diseases].

Disease and trauma to the central and peripheral nervous system can result in various disturbances to the stability and mobility of the knee joint. The aims of orthopaedic treatment in flaccid paralysis, spasticity, rigidity, athetosis and ataxia are discussed. The effect on the musculo-skeletal system is most severe when the damage occurs prenatally. The tendency to deformity in perinatal cerebral spastic disorders of movement can be considerably reduced by early systematic functional treatment. Active and passive exercise, corrective and reflex inhibiting casts and orthoses have proved their value in the prevention and treatment of muscle contractures in flaccid paralysis and spasticity. The dangers of treatment, such as subluxation of the knee and hip joint, osteoporotic fractures, and traction paralysis, must be taken into account. Muscle contractures often hinder function, both in spasticity and in flaccid paralysis, more than the underlying disease. The operative treatment of flexion contractures and impaired knee flexion in the swing phase of the step is discussed. Gait analysis facilitates the planning of treatment. The hip, knee and ankle joints must be treated as a single functional unit.