[Stress fractures of the femoral neck due to step aerobics--case report].

With the rising public interest in physical fitness an increasing number of stress reactions of the bone are diagnosed. Commonly known in competitive athletes, they are increasingly seen in recreational sports. Stress reactions of the bone are a disorder between the loading force and the capability to compensate. Stress fractures with displacement of the bone are more rarely diagnosed due to improved diagnostic means. Stress fractures of the medial femoral neck in young athletes are uncommon. We are reporting the case of a beginning tension type stress fracture of the medial femoral neck of a 29 year old female recreational athlete after excessive stepping and step aerobic at a fitness center.