Isolated femoral agenesis/hypoplasia

Isolated femoral agenesis/hypoplasia (also known as isolated proximal femoral focal deficiency or isolated femoral deficiency) is a rare congenital limb malformation characterized by the partial or complete absence (agenesis) or underdevelopment (hypoplasia) of the femur (thighbone). The condition may affect one leg (unilateral) or both legs (bilateral), with unilateral involvement being more common. The term 'isolated' indicates that the femoral deficiency occurs without other major associated anomalies, distinguishing it from syndromic forms such as femoral hypoplasia–unusual facies syndrome. Clinically, affected individuals present with significant limb length discrepancy, shortened thigh, and abnormal hip and knee joint mechanics. The degree of severity varies widely, ranging from mild shortening of the femur to near-complete absence of the bone. Associated findings may include hip instability, limited range of motion, abnormal gait, and functional impairment of the affected limb. The condition is apparent at birth and is often detected prenatally through ultrasound imaging. Management is multidisciplinary and depends on the severity of the deficiency and the degree of limb length discrepancy. Treatment options include orthotic devices, prosthetic fitting, limb lengthening procedures (such as distraction osteogenesis using external fixators), and reconstructive surgical interventions. In severe cases, rotationplasty (Van Nes rotation) or amputation followed by prosthetic rehabilitation may be considered to optimize function and mobility. Physical therapy and rehabilitation play an essential role throughout the patient's growth and development. The etiology of isolated femoral agenesis/hypoplasia remains largely unknown in most cases, and it typically occurs sporadically without a clear genetic cause.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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