Final answer:
An avulsion fracture of the tuberosity of the 5th metatarsal is associated with the fibularis brevis muscle, typically occurring when the muscle's tendon pulls off a piece of bone during a forceful contraction or ankle twist.
Step-by-step explanation:
An avulsion fracture of the tuberosity of the 5th metatarsal is closely associated with the fibularis brevis muscle, also known as the peroneus brevis. This injury occurs when the tendon of the fibularis brevis muscle exerts a powerful force, leading to the detachment or pulling off of a fragment of bone, specifically from the base of the fifth metatarsal. The fibularis brevis muscle is responsible for eversion of the foot, playing a crucial role in stabilizing the ankle joint.
The mechanism of injury often involves a sudden and forceful contraction of the fibularis brevis muscle or an abrupt twist of the ankle. Such incidents commonly occur during activities that demand lateral movements or excessive stress on the ankle, making athletes and dancers particularly susceptible. Due to its association with dance movements, this type of fracture is colloquially termed a "dancer's fracture." Additionally, depending on the specific location of the fracture along the fifth metatarsal, it may be referred to as a "Jones fracture."
Prompt diagnosis and appropriate management are essential for avulsion fractures of the tuberosity of the 5th metatarsal. Treatment may involve rest, immobilization, and in some cases, surgical intervention. Understanding the anatomical connection between the fibularis brevis muscle and the base of the fifth metatarsal is crucial for healthcare professionals in effectively addressing and managing this specific type of foot injury.