Of 1322 patients with fractures of the proximal femur, 86 had muscular disturbances. Of these, 65 were suffering from paresis due to cerebrovascular stroke and 21 had Parkinson's disease. In the paretic patients, except for one case, the fracture occurred on the affected (paretic) side, and it was intertrochanteric in the majority of cases. In the patients with Parkinson's disease, cervical (intracapsular) fractures predominated. Muscle weakness or disturbance is a factor in the causation and location of hip fractures.