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Common variations of the radial writs extensors
The Journal of Hand Surgery
|March 1, 1978
Summary
Anatomical variations in the extensor carpi radialis longus (ECRL) and brevis (ECRB) muscles are common, affecting 50% of upper limbs. These variations, including interconnecting tendons and an extra extensor carpi radialis intermedius muscle, have surgical rehabilitation potential.
Area of Science:
- Anatomy
- Orthopedics
- Surgical Rehabilitation
Background:
- The extensor carpi radialis longus (ECRL) and extensor carpi radialis brevis (ECRB) are key forearm muscles.
- Understanding anatomical variations is crucial for surgical procedures and rehabilitation.
Observation:
- A study of 173 upper limbs revealed significant anatomical variations in the ECRL and ECRB.
- Abnormalities were present in 50% of the studied upper limbs.
- Common variations included interconnecting tendons and the presence of an extensor carpi radialis intermedius muscle.
Findings:
- Interconnecting tendons between ECRL and ECRB were observed in 35% of limbs.
- A distinct extensor carpi radialis intermedius muscle was found in 24% of limbs.
- The extensor carpi radialis intermedius muscle was often substantial, suitable for tendon transfer.
Implications:
- These anatomical variations, particularly the extensor carpi radialis intermedius, offer potential for tendon transfer in surgical rehabilitation.
- Case reports demonstrate the successful use of these variations in treating paralytic disorders.
- Knowledge of these variations aids orthopedic surgeons in planning and executing reconstructive procedures.