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Posterior Tibial Tendon Dysfunction

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Summary

Posterior tibial tendon dysfunction (PTTD) is the leading causes of acquired flatfoot in adults. The stages of PTTD include inflammation of the tendon, partial tear or complete tendon tear.  The onset of PTTD is insidious and is progressive. An abrupt onset is possible but is typically linked to some form of trauma, whether it be simple (stepping down off a curb or ladder) or severe (falling from a height or automobile accident). PTTD is seldom seen in children and increases in frequency with age.  The onset of PTTD is unilateral but it is not uncommon to see bilaterally.  PTTD is a condition that increases in frequency with age and the prevalence of poor health indicators such as diabetes and obesity.  Posterior tibial tendon dysfunction is found equally in men and women.

Symptoms

  • Loss of medial arch height
  • Painful swelling of the medial arch
  • Pain increased with weight bearing and toe raise
  • Often lateral ankle pain found in addition to medial arch pain

Description

PTTDThere have been many proposed explanations for PTTD over the years since this condition was first described by Kulkowski in 1936. The most contemporary explanation refers to an area of hypovascularity (limited blood flow) in the tendon just below the ankle. Tendon derives most of its' nutritional support from synovial fluid produced by the outer lining of the tendon. Extremely small blood vessels also permeate the tendon sheath to reach tendon. This makes all tendon notoriously slow to heal. In the case of the posterior tibial tendon, this problem is exacerbated by a distinct area of poor blood flow (hypovascularity). This area is located in the posterior tibial tendon just below or distal to the inside ankle bone (medial malleolus).

PTTD is a progressive condition, meaning to say, that if left untreated, PTTD will worsen over time. The onset of PTTD begins with focal tendonitis. If left untreated, tendonitis will progress to partial and then complete tears of the posterior tibial tendon. As PTTD becomes more severe, the ability of the posterior tibial tendon become less able to support the arch.  Hence the collapse of the arch associated with PTTD.  Several classifications have been developed to describe posterior tibial tendon dysfunction. The classification as described by Johnson and Strom is most commonly used today.

Stage I Posterior tibial tendonitis without tendon tear

Tendon status - Attenuated (lengthened) with tendonitis but no rupture.
Clinical findings - Palpable pain in the medial arch. Foot is supple, flexible. Too many toes sign may be positive or negative.PTTD
X-ray/MRI - Mild to moderate tenosynovitis on MRI, no X-ray changes found.

Stage II Posterior tibial tendonitis with partial tendon tear
Tendon status - Attenuated with possible partial or complete rupture.
Clinical findings - Pain in arch. Unable to raise on toes. Too many toes sign positive.
X-ray/MRI - MRI notes tear in tendon. X-ray noting abduction of forefoot, collapse of talo-navicular joint.

Stage III Posterior tibial tendonitis with partial to complete tendon tear.
Tendon status - Severe degeneration of the tendon with likely rupture.
Clinical findings - Rigid flatfoot with inability to raise up on toes. Too many toes sign positive.
X-ray/MRI - MRI shows tear in tendon. X-ray noting abduction of forefoot, collapse of talo-navicular joint

The posterior tibial tendon is the extension of the posterior tibial muscle that lies deep to the calf. The origin of the posterior tibial muscle is the posterior aspect of both the tibia and fibula and the interosseus membrane. The insertion of the posterior tibial muscle is the medial navicular where the tendon divides into nine different insertion site on the bottom of the foot.  The function of the posterior tibial tendon is to plantarflex the foot at the toe off phase of the gait cycle and to stabilize the medial arch and subtalar joint as the body passes over the foot.

Causes and contributing factors

Tendon is most susceptible to fatigue and failure at an area where the tendon changes direction. As the posterior tibial tendon descends the leg and comes to the inside of the ankle, the tendon follows a well defined groove in the back of the tibia (bone of the inside of the ankle). The tendon then takes a dramatic turn towards the arch of the foot. If the tendon is put into a situation where significant load is applied to the foot, the tendon responds by pulling up as the load of the body (in addition to gravity) pushes down. At the location where the tendon changes course, the tibia acts as a wedge and may apply enough force to actually damage or rupture the tendon.

Equinus is also a contributing factor in cases of PTTD. Equinus is the term used to describe the ability or lack of ability to dorsiflex the foot at the ankle (move the toes towards the shin). Equinus is usually due to tightness in the calf muscle, also known as the gastroc-soleal complex (a combination of the gastrocnemius and soleus muscles). Equinus may also be due to a bony block in the front of the ankle. The presence of equinus forces the posterior tibial tendon to accept additional load during gait.

Additional contributing factors that contribute to the onset of posterior tibial tendon dysfunction may include obesity, hypertension, diabetes, peripheral neuropathy, smoking or arthritis.

Differential diagnosis

The differential diagnosis for PTTD includes;

Arthritis
Anterior tibialis tendinitis
Calcaneal stress fracture
Flexor hallucis longus tendonitis
Posterior tibial tendon rupture
Shepard's fracture
Sinus tarsi syndrome
Subtalar joint arthritis
Symptomatic os tibiale externum
Tarsal tunnel syndrome
Tibial stress fracture

Os_tibiale_externum_x-rayThe os tibiale externum, or what is frequently called and accessory navicular, is a small bone that resides within the body of the PT tendon. The os tibiale externum functions to facilitate motion around the navicular. The os tibiale externum functions much in the same way that the knee cap (patella) works to guide the quadraceps tendon around the knee as it bends. The os tibiale externum can undergo degenerative wear called chondromalacia. The os tibiale externum also can fracture. Therefore, the os tibiale externum must also be considered when diagnosing PT tendon pain.

Treatment

The diagnosis of PTTD is made by a combination of patient history, clinical exam, x-ray, ultrasound and MRI.  The clinical exam exam includes a non-weight bearing and weight bearing exam of the foot.  X-ray are used to determine an contributing factors such as boney blocks of the foot or arthritis.  Ultrasound or MRI are very useful to assess the integrity of the posterior tibial tendon. 

A common test to evaluate PTTD is the 'too many toes sign'. The 'too many toes sign' is a test used to measure abduction (deviation away from the midline of the body) ofToo_many_toes_sign the forefoot. With damage to the posterior tibial tendon, the forefoot will abduct or move out in relationship to the rest of the foot. In cases of PTTD, when the foot is viewed from behind, the toes appear as 'too many' on the outside of the foot due to abduction of the forefoot.

Treatment of PTTD is dependant upon the clinical stage and the health status of the patient. It is important to recognize that PTTD is a mechanical problem that requires a mechanical solution. This means that treating PTTD with medication alone is fraught with failure. Prompt introduction of some form of mechanical support is imperative.

Surgical procedures which focus on primary repair of the posterior tibial tendon by itself have proven to be very unsuccessful. This is due to the fact that tendon heals slowly following injury and cannot be relied upon as a sole solution for PTTD cases. Surgical success is usually achieved by stabilization of the rearfoot (subtalar joint) which significantly reduces the work performed by the posterior tibial tendon.

Stage I PTTD may respond to treatment that includes variations of rest. Variations in rest include an ankle brace, walking cast with an elevated heel or a hard, below the knee non-weight bearing cast. Pain and inflammation may be controlled with anti-inflammatory medications. It is important to be sure that Stage I patients realize that the use of shoes with additional arch support and heel elevation is imperative. Arch support and heel elevation should be continued indefinitely. Arch support, whether built into the shoe or added as an orthotic, helps support the posterior tibial tendon and decrease the amount of mechanical load applied to the posterior tibial tendon. Elevation of the heel, reduces equinus, one of the most significant contributing factors to PTTD. If Stage I patients return to low heels without arch support, PTTD will recur.

Stage II patients typically require surgical correction to stabilize the subtalar joint prior to further damage to the posterior tibial tendon. Subtalar arthroeresis is a procedure used to stabilize the subtalar joint. Subtalar arthroeresis may only be used in flexible feet. Arthroeresis is a term that means the motion of the joint is blocked without fusion. Subtalar arthroeresis can only be used in cases of Stage II posterior tibial tendonitis where mild to moderate deformation of the arch has occurred and MRI findings show the tendon to be only partially ruptured. Subtalar arthroeresis is typically performed in conjunction with an Achilles tendon lengthening procedure or endoscopic gastrocnemius recession to correct equinus. These procedures require casting for a period of weeks following the procedure.

The following video shows placement of a subtalar joint implant for control of pronation in a flexible foot with PTTD. The sinus tarsi is dissected free of capsule and ligament and the implant is placed in the sinus tarsi. This procedure is completed in a hospital or out-patient surgery center using a general anesthetic. Patients can walk immediately following subtalar arthroeresis if an Achilles tendon lengthening is not performed. If an Achilles tendon lengthening is performed, a 6 week period of non-weight bearing casting is required. 

When a symptomatic os tibiale externum is present, a modified Kidner procedure is performed. The following images show excision of the os tibiale externum and transposition of the posterior tibial tendon. This procedure is performed in a hospital or out-patient surgery center using a general anesthetic. Weight bearing following the surgery is dependent upon the integrity of the tendon following excision of the os tibiale externum. Most modified Kidner procedures do require a period of non-weight bearing.

 modified_Kidner_surgery modified_Kidner_surgery modified_Kidner_surgery

 modified_Kidner_surgery Modified Kidner Modified Kidner procedure

Modified Kidner procedure Modified Kidner procedure

Stage III patients require stabilization of the rearfoot with procedures that fuse the primary joints of the arch and foot. Rearfoot stabilization is used to correct rigid triple_arthrodesis_x-raydeformities of the foot. These procedures are salvage procedures and require prolonged casting and disability following surgery. A common procedure for Stage III is called triple arthrodesis which is a technique used to fuse the subtalar joint, the talo-navicular joint and the calcaneal cuboid joint (picture at left). 

Additional procedures used to treat Stage III PTTD include an Evans procedure.  The Evans procedure is used to lengthen the lateral column of the foot, correcting the abduction deformity diagnosed with the 'too many toes' sign.  Calcaneal displacement osteotomies are commonly used to center the heel beneath the load of the leg.  Tendon transposition is used, sacrificing the flexor digitorum longus tendon or flexor hallucis tendon.  These tendon transfers are used to graft the posterior tibial tendon.

 

When to contact your doctor

PTTD is a progressive problem that should be evaluated by your podiatrist or orthopedist.

References

References are pending.

Author(s) and date

Dr. Jeffrey OsterThis article was written by Myfootshop.com medical director Jeffrey A. Oster, DPM.  

Competing Interests - None

Peer Reviewed - This article is peer reviewed by an open source editorial board.  Your comments and suggestions to improve this paper are appreciated.

Cite this article as: Oster, Jeffrey. Posterior Tibial Tendon Dysfunction.  http://www.myfootshop.com/article/posterior-tibial-tendon-dysfunction

First published online: January 1, 2000.  Most recently updated 12/10/13.
 

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