What mechanism of injury typically leads to peroneal tendon subluxation?

• A. Inversion of the foot while in plantarflexion
• B. Inversion of the foot while in dorsiflexion
• C. Eversion of the foot while in plantarflexion
• D. Supination of the foot while at rest

Answer: (B)

The mechanism of injury that typically leads to peroneal tendon subluxation is inversion of the foot while in dorsiflexion. This specific position places significant stress on the peroneal tendons as they traverse behind the lateral malleolus and into the foot. During the inversion motion, particularly when the foot is dorsiflexed, the tendons may be subjected to excessive lateral tension and can slip out of their normal anatomical position, resulting in subluxation. This is exacerbated by the change in the foot's angle and the alignment of the tendons during this movement, making it a common mechanism of injury in activities that involve sudden changes in direction or awkward ankle movements. Understanding this mechanism is crucial for diagnosing and treating peroneal tendon injuries effectively.