The tendon of which muscle is involved when the tuberosity of the fifth metatarsal bone is avulsed in an inversion fracture
**Core Concept**
The question tests knowledge of **musculoskeletal anatomy** and **orthopedic trauma**, specifically the relationship between muscles, tendons, and bones in the foot. The **peroneal muscles** are key to understanding this type of injury.
**Why the Correct Answer is Right**
In an inversion fracture, the tendon of the **peroneus brevis muscle** is commonly involved when the tuberosity of the fifth metatarsal bone is avulsed. This occurs because the peroneus brevis tendon attaches to the base of the fifth metatarsal bone, and during an inversion injury, the tendon can pull off a piece of bone, resulting in an avulsion fracture.
**Why Each Wrong Option is Incorrect**
**Option A:** This is not the correct muscle involved in this specific type of fracture.
**Option B:** Similarly, this option does not accurately describe the muscle whose tendon is involved in the avulsion fracture of the fifth metatarsal tuberosity.
**Option D:** This option is also incorrect as it does not correspond to the muscle responsible for the avulsion fracture in question.
**Clinical Pearl / High-Yield Fact**
Remember that the peroneus brevis muscle plays a crucial role in foot stability, and its injury can lead to significant disability. The **Jones fracture**, another type of fracture involving the fifth metatarsal, is distinct from the avulsion fracture described and has a different treatment approach.
**Correct Answer:** D. peroneus brevis muscle