Which of the following tendon is more likely to rupture during violent dorsiflexion of the foot ?
## **Core Concept**
The question tests knowledge of foot anatomy and the mechanics of tendon injuries. Tendon ruptures during violent dorsiflexion of the foot are related to the tendons that control foot movements, specifically those involved in plantarflexion.
## **Why the Correct Answer is Right**
The Achilles tendon, or **tendon of calcaneus**, is the thickest and strongest tendon in the human body, connecting the calf muscles (gastrocnemius and soleus) to the calcaneus bone. During violent dorsiflexion of the foot, the Achilles tendon is subjected to significant stress because it is the primary structure resisting this movement. Its rupture is more likely in such scenarios due to the forceful stretching and potential tearing of the tendon.
## **Why Each Wrong Option is Incorrect**
- **Option A:** The **tendon of tibialis anterior** is involved in dorsiflexion and inversion of the foot. It is not the primary tendon resisting dorsiflexion; rather, it facilitates this movement.
- **Option B:** The **tendon of peroneus longus** aids in eversion and plantarflexion of the foot but is not the primary tendon at risk during violent dorsiflexion.
- **Option C:** This option seems to be missing but based on typical anatomy, if we consider other tendons like the **tendon of flexor hallucis longus** or **tendon of tibialis posterior**, they are not primarily involved in resisting dorsiflexion.
## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that Achilles tendon ruptures often occur during activities that involve sudden, forceful dorsiflexion of the foot, such as in sports. A classic sign of an Achilles tendon rupture is the inability to stand on tiptoes on the affected side. The Thompson test (calf squeeze test) is a useful diagnostic tool.
## **Correct Answer:** . Achilles tendon (tendon of calcaneus)