Duplication of the extensor carpi ulnaris tendon

Area of Science:

• Hand Surgery
• Anatomical Variations
• Musculoskeletal Disorders

Background:

• The extensor apparatus of the hand plays a crucial role in finger extension and wrist stability.
• Anatomical variations in tendons can lead to impingement and functional deficits.
• Repetitive stress injuries are common in musicians, potentially exacerbating underlying anomalies.

Observation:

• Three cases of an anomalous tendon slip between the extensor carpi ulnaris tendon and the extensor apparatus of the fifth finger were identified.
• One patient, a violinist, experienced severe left wrist joint and small finger impairment directly linked to this anomaly.
• The anomalous slip created a mechanical block or irritation affecting the normal function of the extensor tendons.

Findings:

• Histological examination or detailed anatomical dissection confirmed the presence of an aberrant tendon slip.
• The anomalous tendon slip was consistently located between the extensor carpi ulnaris and the extensor digiti minimi tendons.
• Surgical excision of the anomalous tendon slip was performed in all three cases.

Implications:

• This anatomical variation can cause significant wrist and hand dysfunction, mimicking other common conditions.
• Early diagnosis and surgical intervention, such as tendon slip excision, can restore function and alleviate pain.
• Awareness of this anomaly is crucial for hand surgeons and clinicians treating musicians or individuals with unexplained wrist pain and limited finger mobility.