Peroneal Tendon Subluxation Surgery

The peroneal tendons are anatomical structures that attach the peroneal muscles to the outer part of the foot.

One peroneal tendon attaches to the outer part of the midfoot, while the other tendon runs under the foot and attaches near the inside of the arch. The peroneal tendons functions primarily to stabilize the foot and ankle and protect them from sprains.

The tendons are held in place by a retinaculum. Damage or injury to the structures that support the tendons may result in dislocation of the tendons.

This condition is referred to as peroneal tendon subluxation. Treatment options for this condition may be surgical or non-surgical depending on the severity and extent of injury.

Anatomy

Peroneal Tendon Subluxation Surgery

peroneal tendon subluxation

The peroneal muscles (Peroneus brevis and Peroneus longus) are the primary muscles supporting the outer part of the ankle. The two muscles and their tendons are located along the outside of the fibula (lower leg bone) and cross behind the lateral mallelus (the outside ankle bone).

The tendons are stabilized by a superior peroneal retinaculum which is formed by thickening of the superficial aponeurosis.

Causes

Peroneal tendon subluxation often results from a dorsiflexion force on the ankle with a rapid and strong contraction of the peroneal tendons. This leads to damage to the retraining reticulum causing the peroneal tendons to move out of place.

The injury to the retinaculum may be overlooked at first and there may be differential diagnosis for ankle sprain. The result is that subluxation may begin much later, hence a chronic problem results.

In the past, the sport most associated with this injury was alpine skiing, which correlates with the premise of forced dorsiflexion and acute muscle contraction against a fixed ankle in a ski boot.

However, recent literature does suggest that peroneal tendon subluxation can occur with those in several other sports, including football, soccer, basketball, baseball, softball and tennis.

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Classification

Peroneal tendon subluxation can be classified into four (4) grades based on the Eckert and Davis classification.

Grade I. The retinaculum is stripped away from the fibula, resulting in dislocation of the tendons.

Grade II. The fibrocartilaginous ridge and the retinaculum is avulsed from the posterior aspect of the fibula.

Grade III. Bony avulsion of the posterolateral aspect of the fibula containing the cartilaginous rim and a flake of bone permitting the tendon to slide beneath the periosteum.

Grade IV. The retinaculum is avulsed or ruptured from the posterior attachment, causing the retinaculum to be deep to the dislocating tendons.

Diagnoses

The diagnosis of peroneal subluxation begins with an examination of the ankle. The doctor will move your ankle in different positions to see when the tendons snap out of place and if they relocate.

One test involves holding pressure down on the ankle as you pull your foot up and out. The doctor feels behind the fibula during this test to determine if the tendons are popping out of place.

If your doctor suspects a tear in the retinaculum, X-rays will probably be taken. X-rays can show if the torn retinaculum has pulled off a piece of the fibula bone.

This is called an avulsion fracture. X-rays are also used to look for other injuries to the ankle.

Treatment

Peroneal tendon subluxation can be treated through non-surgical and surgical means. The non-surgical means of treatment generally involves less risks but it has high failure rates.

Surgery is often required when the conservative and non-surgical means are not successful.

Non-surgical Treatment

If the injury is acute, treatment without surgery may involve placing the ankle in a short-leg cast for four to six weeks. The goals are to allow the torn retinaculum to heal and to prevent chronic subluxation. Doctors may have their patients begin Physical Therapy once the cast is removed.

Your doctor may also prescribe medications. Anti-inflammatory medications can help ease pain and swelling and get you back to activity sooner.

These medications include common over-the-counter drugs such as ibuprofen.

Peroneal Tendon Subluxation Surgery

Surgery may be indicated to treat some grades of peroneal tendon subluxation. There are various surgical techniques depending on the grade of the condition.

  1. Retinaculum Repair

Retinaculum repair is gaining popularity. This procedure restores the normal anatomy of the retinaculum that covers and reinforces the tendon sheath around the peroneal tendons.

In surgery to repair the retinaculum, the surgeon first makes an incision along the back and lower edge of the fibula bone. This lets the surgeon see the spot where the retinaculum is torn.

The surgeon uses a burr to create a trough along the fibula bone next to the original attachment of the retinaculum. The torn edge of the retinaculum is then pulled into the trough and sutured in place. The skin is closed with stitches.

  1. Groove Reconstruction

Groove reconstruction is done to deepen the groove so the peroneals stay in place behind the bottom tip of the fibula. In this procedure, the surgeon first makes an incision along the back and lower edge of the fibula bone.

The surgeon cuts a small flap in the bone near the bottom corner of the fibula. The surgeon then carefully folds the flap back, like a hinge.

With the hinge held open, the doctor scoops out a small amount of bone under the flap to deepen the groove.

The surgeon closes the flap on its hinge and tamps it in place. A screw may be used to hold the flap down.

Next, the tendons are returned to their location behind the tip of the fibula. Repair of the retinaculum may also be required with this procedure (see above). The skin is closed and sutured.

Risks and Complications

Like every surgical procedure, there are risks and complications with peroneal tendo surgery. They include:

  1. Bleeding
  2. Infection

iii. Recurrence of the peroneal tendon subluxation. The surgical repair can stretch out or be reinjured, leading to recurrence of the peroneal tendon subluxation.

  1. Nerve injury. The sural nerve maybe injured. This nerve supplies the sensation to the outside of the foot. An injury to this nerve can result in numbness over the outside of the foot or a burning sensation radiating towards the outside of the foot.

Peroneal Tendon Subluxation Surgery Cost

The total cost for peroneal tendon subluxation surgery depends on a lot of factors such as the anesthetic fee, private hospital fee, private operating facility fee, extent of surgery required. The total cost of the procedure is around $6500 – $7500.

Recovery

Recovery from surgery requires a moderately long period, usually in the order of 2-6 weeks of immobilization, in order to allow the retinaculum and any bony procedures to heal.

This is followed by four to six weeks of fairly graduated and intensive rehabilitation. It is often six months or more before the patient has reached a lot of their improvement following the surgery.

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