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Congenital thumb flexion deformities, often caused by trigger thumb, may resolve spontaneously in infants. Surgical intervention is recommended for persistent cases after age one to restore thumb function.
Area of Science:
- Orthopedics
- Pediatric Surgery
- Developmental Biology
Background:
- Congenital flexion deformities of the thumb present unique challenges in pediatric orthopedic care.
- These deformities can affect the interphalangeal (IP) or metacarpophalangeal (MP) joints, impacting thumb function.
Observation:
- Trigger thumb, characterized by a palpable nodule in the flexor pollicis longus (FPL) tendon, is a common cause of IP joint flexion deformity.
- MP joint deformities range from correctable soft tissue issues to severe contractures involving multiple digital structures.
Findings:
- Spontaneous regression of IP joint trigger thumb occurs in approximately 30% of cases by age one, after which surgical correction is typically effective.
- Passively correctable MP joint deformities may respond to casting or tendon transfers, while complex cases require extensive surgical reconstruction.
Implications:
- Early recognition and classification of congenital thumb deformities, especially those associated with syndromes, are crucial for effective treatment planning.
- Tailored surgical approaches, including soft tissue release and reconstructive procedures, can significantly improve thumb function and patient outcomes.
Abstract:
A congenital flexion deformity of the IP joint of the thumb is usually due to a trigger finger. The diagnosis is based on the thumb being normal except for a fixed, flexed posture of the IP joint and a palpable nodule in the FPL tendon at the level of the A-1 pulley. Treatment can be postponed until after age 1, as spontaneous regression probably occurs in about 30 per cent of cases. After that age, surgical correction is the best approach to treatment and usually results in normal thumb function. Congenital soft tissue flexion deformities of the MP joint of the thumb vary from passively correctable deformities due to loss of extensor power to severe, fixed contractures involving multiple thumb structures and associated with significant anomalies of the wrists and fingers. The passively correctable deformities will frequently respond to cast immobilization in the very young but can otherwise be treated by an appropriate tendon transfer to re-institute active extension. Complex clasped thumb deformities require elucidation of the specific pathologic features of the deformity, based both on clinical evaluation and surgical exploration. These digits will require not only an extensive release to correct the fixed contracture but also reconstructive procedures to correct lax ligaments and to substitute for absent muscles and skin as appropriate. The latter deformities are often associated with a syndrome affecting numerous body structures. It is hoped that recognition of these syndromes and documentation of the pattern of pathology present in these thumbs will result in a better method of classification.