Peroneus Brevis

PERONEAL TENDONS
By:  Robert H. Sheinberg, D.P.M., D.A.B.P.S., F.A.C.F.A.S.

The peroneal tendons are two strong tendons that connect the muscles on the outside of the leg to the bones in the foot.  They run behind the bone in the ankle called the fibula.  When they contract they move the foot down and out.  They play an important role in stabilizing the foot on uneven surfaces.  When the foot turns excessively in (i.e. attempt at ankle sprain) these tendons contract and stabilize the ankle so that it does not twist too far in.   Tendons are covered by a ligament called the peroneal retinaculum.  It is a strong ligament that connects the outer leg bone (fibula) to the heel (calcaneus).  The ligament covers the peroneal tendons and helps keep them in a groove behind the fibula.  Under normal circumstances it helps to allow the tendons to contract with extremely high forces without dislocating.  Without this ligament restraint, the muscle tendon unit cannot generate enough force during activity.  If the tendons dislocate, they do not have a normal mechanical advantage and they become weak and painful and tears often develop in the tendon. 

CAUSE:

  • Weak or loose ligament that covers the tendons can allow the tendons to dislocate. 
  • A shallow groove in the fibula may not allow the tendons to seat properly. 
  • Twisting injury to the ankle that causes the tendons to over contract and tear the ligament that covers it. 
  • Twisting injury to the ankle may cause a severe contraction causing a fracture off of the fibula, allowing the tendons to dislocate.
  • Anomalous muscle in the outer part of the ankle.
  • Hypertrophy of a normal muscle causing too much bulk on the outside of the ankle.

SIGNS AND SYMPTOMS:

  • Swelling behind the fibula on the outside of the ankle.
  • Popping sensation with movement of the foot down and in and up and out.
  • Appearance of the tendons in the front part of the ankle instead of in their normal position behind the fibula where they are not visible.
  • Weakness with activity.
  • Frequent ankle sprains.
  • Often associated with a tear of the peroneus brevis tendon.
  • May be associated with ankle ligament injury and chronic instability of the ligaments in the ankle.

TREATMENT:

  • X-rays are usually taken to see if any bone injury has occurred in conjunction with the ligament tear.
  • MRIs are necessary to evaluate not only the injury to the ligament but also the tendon to identify any split tears.  CT scans may be necessary to evaluate the depth of the groove in the fibula.  When shallow, flat or convex it may be necessary to repair this at the same time.
  • If an acute injury is seen early, immediate application of a cast will possibly allow the ligament to heal while keeping the tendons in their proper place behind the fibula.
  • If unresponsive to casting, surgical repair of the ligament is necessary.
  • If a shallow groove in the bone is seen it may be deepened to allow the tendon to sit in a better position without recurring subluxation.
  • If a tendon is also torn it is repaired at the same time as the ligament that holds it in place.
  • If chronic instability of the ligaments in the front of the ankle is seen at the same time they are also repaired to allow more normal ankle function and a full return to activity.
  • Any anatomical variant is addressed at the time of surgery, including removal of any anomalous muscle that may be contributing to the recurrent subluxation.

PROGNOSIS:

  • Excellent in a recreational or professional athlete allowing future participation at the preinjury level.
     

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Below, Peroneal Tendon Tear with low-lying muscle belly that is being removed in 3rd pic. The tendon is then repaired and tubularized.

Below, Peroneal Tear with Low lying muscle belly.  The muscle belly is removed and ebulked to allow gliding and reduce congestion.

  

 

The muscle belly is seen at the right and closure of the sheath on the left and bottom pics. 

   

Below, dislocated peroneal tendons are being repaired and reduced to the anatomic location.

The tendons are dislocated to the outside of the fibula instead of behind.

These are intraoperative pics of a woman who traumatically dislocated her peroneal tendons in a fall. 

These are pics of the peroneus longus dislocated over the fibula. The instrument on the bottom is pointing towards the tendon. The instrument on th top left is showing where the tendon should be.

 

This is a pic of us relocating the tendons.

The following pic is of us debriding the side of the fibula to allow the ligament and tissue to connect to the fibula during healing so the tendons do not dislocate.

This is a pic of the suture passing through the fibula to attach the retinaculum and tissue so the peroneal tendons do not dislocate or sublux.

This is a final pic of the repair

Pics of repair of peroneal retinaculum for dislocating peroneal tendons

The sutures can be seen prior to repair

 

The retinaculum is repaired through drill holes in the fibula and the sutures are woven through the bone

Pic after complete repair

Split Tear of the Peroneus Brevis

The torn damaged portion is removed and the tendon is repaired onto itself

Intrasubstance tear with bulbous thickening before and after repair

Bulbous thickening of peroneus brevis with split thickness tear

The bulbous portion is removed and the remainder of the tendon is repaired back onto intself.

Below, Split thickness tear before and after excision of portion of tear

Below, Flattening of Peroneus Brevis before and after repair

Below, Split tear of peroneus brevis before and after repair

Below, Bulbous thickening of the Peroneal tendon

Bulbous thickening of the tendon noted

The tear inside the bulbous thickening is resected and the tendon is repaired onto itself

This is a picture of the CFL being repaired with suture during peroneal tendon repair

Below, Intraop Pics of intrasubstance tear of Peroneus Longus with excision of low lying muscle belly, tear and repair

 

Below, Intraop Pics of intrasubstance tear of peroneus longus with repair

Below, Intraop pics of low lying muscle belly of peroneus brevis

Pic of CFL behind the peroneal tendons

Below, Pic of low lying muscle belly resection of the peroneus brevis which causes pain due to congestion.

Pics of repair of a traumatic laceration of the peroneus brevis

Pic of suture of adjacent side of tear prior to reapposition

Pic of apposition of tendon edges

Split Tear of Peroneus Brevis during repair

Split tear of Peroneus Brevis

Visualization of the tear

The portion diseased tendon removed

After the removal of tissue, the tendon sits nicely behind the groove and the area is debulked

 

Pic during debaulking of peroneus brevis muscle and tendon

Split tear of P. Brevis

Pic after repair. The sutures can be seen in the tendon post repair

 

Intrasubstance tear of Peroneus brevis

Portion of diseased tendon excised

Pic Post repair

Split tear of peroneus brevis during repair

Portion of tendon excised

Pic after repair

Pics of split tear of peroneus brevis

 

Pics of split tears of peroneus brevis

Pic of intrasubstance tear and boomeranging of peroneus brevis tendon

Pics after debaulking of tendon and repair

 

Pic of Split tear of the Peroneus Brevis and section that was removed. This is caused by the Peroneus longus constantly pushing the Brevis into the back of the fibula.  It can be due to repeated microtrauma or one isolated traumatic event, i.e. ankle sprain or fracture).

Pic of Split tear of the Peroneus Brevis and section that was removed. This is caused by the Peroneus longus constantly pushing the Brevis into the back of the fibula. There was also a low lying muscle belly of the Brevis that was removed with the damaged tendon. This can be seen at the left side of the removed tendon. The tear can be due to repeated microtrauma or one isolated traumatic event, i.e. ankle sprain or fracture).


 

 

 

 

 

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