Peroneal retinacula

Peroneal retinacula are fibrous bands in the human anatomy that play a crucial role in the functioning of the lower extremity. They are located on the lateral side of the ankle and serve to hold the peroneal tendons in place.

Anatomy

The peroneal retinacula consist of two separate bands: the superior peroneal retinaculum and the inferior peroneal retinaculum.

Superior Peroneal Retinaculum

The superior peroneal retinaculum (SPR) is a strong fibrous band that extends from the lateral malleolus to the lateral surface of the calcaneus. It covers the peroneal tendons and prevents them from dislocating or bowstringing during ankle movements.

Inferior Peroneal Retinaculum

The inferior peroneal retinaculum (IPR) is a thinner, more flexible band that extends from the lateral malleolus to the undersurface of the foot. It also helps to keep the peroneal tendons in place, particularly during inversion and eversion of the foot.

Function

The primary function of the peroneal retinacula is to stabilize the peroneal tendons, specifically the peroneus longus and peroneus brevis. These tendons play a key role in foot and ankle movement, including eversion and plantar flexion of the foot. By holding these tendons in place, the peroneal retinacula ensure that these movements can occur smoothly and efficiently.

Clinical Significance

Damage or injury to the peroneal retinacula can lead to a condition known as peroneal tendon dislocation, which is characterized by instability, pain, and swelling in the lateral ankle. This condition is often caused by acute trauma or chronic overuse, and is typically treated with rest, physical therapy, and in severe cases, surgery.

See Also

• Peroneal Tendons
• Ankle Joint
• Peroneal Tendon Dislocation