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The pronator quadratus: a distinct forearm space?
D G Sotereanos1, D M McCarthy, J D Towers
1Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, PA, USA.
The Journal of Hand Surgery
|May 1, 1995
Summary
The pronator quadratus sign, linked to distal radius and ulna fractures, may not stem from fluid buildup within the muscle. This study reveals the pronator quadratus muscle occupies a distinct forearm space, lacking intramuscular communication.
Area of Science:
- Anatomy
- Orthopedic Surgery
- Radiology
Background:
- The pronator quadratus sign is clinically observed in distal radius and ulna fractures.
- It is hypothesized to result from fluid accumulation within the pronator quadratus muscle.
Purpose of the Study:
- To anatomically investigate the pronator quadratus muscle's space and fascial boundaries.
- To determine if intramuscular communication exists within the pronator quadratus.
Main Methods:
- Anatomical dissection of cadaveric forearms.
- Dye injection into the pronator quadratus muscle.
- Radiographic examination (X-ray) following dye injection.
Main Results:
- The pronator quadratus muscle occupies a distinct anatomical compartment within the forearm.
- No intramuscular communication pathways were identified within the pronator quadratus.
- Dye remained localized within the defined space of the pronator quadratus muscle.
Conclusions:
- The pronator quadratus sign's presumed mechanism of fluid accumulation within the muscle may require re-evaluation.
- Findings support the pronator quadratus muscle existing in a distinct fascial compartment.
- This anatomical understanding is crucial for interpreting the pronator quadratus sign in distal forearm injuries.