Fibular retinacula

Fibular retinacula are bands of connective tissue that hold the tendons of the peroneal muscles against the lateral aspect of the ankle. They are part of the musculoskeletal system and play a crucial role in the movement of the foot and ankle.

Etymology

The term "retinacula" is derived from the Latin word "retinaculum", which means "a band or strap that holds something back". The term "fibular" refers to the fibula, the smaller of the two bones in the lower leg.

Anatomy

The fibular retinacula consist of two distinct bands: the superior fibular retinaculum and the inferior fibular retinaculum.

Superior Fibular Retinaculum

The superior fibular retinaculum (also known as the superior peroneal retinaculum) extends from the lateral malleolus, the bony prominence on the outside of the ankle, to the lateral surface of the calcaneus, the heel bone. It covers the tendons of the peroneus longus and peroneus brevis muscles.

Inferior Fibular Retinaculum

The inferior fibular retinaculum (also known as the inferior peroneal retinaculum) is a Y-shaped structure that attaches to the lateral malleolus and the calcaneus. It covers the tendons of the peroneus longus and peroneus brevis muscles as they pass behind the lateral malleolus.

Function

The fibular retinacula serve to hold the tendons of the peroneal muscles in place as they pass around the lateral malleolus. This prevents the tendons from bowstringing, or pulling away from the bone, during movement of the foot and ankle.

Clinical Significance

Damage to the fibular retinacula can result in peroneal tendon dislocation, a condition in which the tendons of the peroneal muscles slip out of place. This can cause pain, swelling, and difficulty moving the foot and ankle.

See Also

• Peroneal muscles
• Musculoskeletal system
• Peroneal tendon dislocation

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