Rupture of the extensor pollicis longus--a crush injury

Area of Science:

• Orthopedic surgery
• Hand and wrist anatomy
• Traumatology

Background:

• Colles fractures are common wrist injuries.
• Rupture of the extensor pollicis longus (EPL) tendon is a known complication.
• The exact mechanism of EPL tendon rupture after Colles fracture is not fully understood.

Purpose of the Study:

• To propose a specific mechanism for extensor pollicis longus tendon rupture following Colles fracture.
• To elucidate the role of anatomical structures in this complication.

Main Methods:

• Review of anatomical structures involved in wrist extension.
• Analysis of biomechanical forces during extreme wrist extension.
• Case study review (implied).

Main Results:

• The extensor pollicis longus tendon can be crushed between the radial dorsal tubercle and the ulnar styloid process.
• This crushing occurs during forced extreme wrist extension.
• This mechanism can lead to tendon rupture even in a previously normal tendon.

Conclusions:

• Crushing of the extensor pollicis longus tendon is a potential cause of its rupture after Colles fracture.
• Understanding this mechanism can inform surgical repair and rehabilitation strategies.
• Prevention may involve careful management of wrist positioning post-fracture.