Posterior Tibial Tendon Dysfunction (PTTD) is a common cause of pain along the inside of the ankle and foot. It involves the tibialis posterior tendon, which runs behind the inside ankle bone (medial malleolus) and attaches into the midfoot. This tendon plays a key role in supporting the arch and controlling how the foot loads during standing, walking, and running, so when it becomes overloaded or irritated it can lead to pain, fatigue, and reduced tolerance for activity.
PTTD is best understood as a spectrum rather than a single injury. It can start as tendon overload and irritation, and in more persistent cases the tendon may struggle to support the foot as effectively, which can change how the foot and ankle joints move and share load. These changes can increase stress through the inner ankle and midfoot and may lead to ongoing irritation and joint discomfort if not addressed early.
In the early stages, PTTD often responds very well to conservative treatment. Physiotherapy can help identify contributing factors, guide activity modification, and progressively build tendon strength and endurance. Supportive strategies such as taping, bracing, and orthotics may also be used to reduce tendon load and improve comfort while rehabilitation progresses. In more advanced or persistent cases, physio still plays an important role in managing symptoms, maintaining function, and supporting referral to a specialist if further medical input is needed.
Key Facts
- PTTD is a common cause of pain along the inside of the ankle and foot, because the posterior tibial tendon helps support the arch and control foot loading during walking. 🔗
- It is usually a gradual overload problem (tendinopathy) rather than a sudden injury, and over time the tendon can weaken, stretch, or tear. 🔗
- A classic sign is difficulty or pain performing a single-leg heel raise, and clinicians may also notice the foot turning out (“too many toes” sign). 🔗
- Most cases start with conservative care, including short-term immobilisation for high irritation and orthotics/support for longer-term management, with surgery generally considered only if conservative treatment fails. 🔗
Risk Factors
- Age-related tendon change, especially in people over 40 and more commonly over 55.
- Higher body mass, which increases load through the arch and tendon.
- Diabetes and hypertension, which are associated with tendon and vascular changes.
- A history of ankle or foot trauma, including previous ankle sprains or surgery.
- Prolonged weight-bearing work or sudden increases in walking and running.
- Foot posture or mechanics that increase strain through the medial arch during gait.
Symptoms
- Pain along the inside of the ankle and foot, sometimes with swelling behind the medial malleolus.
- Pain that is aggravated by walking or running, especially on uneven surfaces.
- A flatter-looking foot or an arch that collapses and the foot rolls in more than usual.
- Pain or weakness when trying to stand on tip-toes or perform a single-leg heel raise.
- A sense of fatigue through the inside of the foot and ankle after standing or walking.
- In more advanced stages, increasing foot deformity, difficulty fitting shoes, and pain on the outer side of the foot from compression as the foot collapses.
Aggravating Factors
- Long periods of standing or walking, especially on hard surfaces.
- A rapid increase in walking or running volume, hill work, or return to sport after time off.
- Uneven ground walking, trails, or sand where the ankle has to stabilise constantly.
- Going up on tip-toes, stairs, or any activity that requires strong push-off.
Causes
The most common driver of PTTD is overload to the tibialis posterior tendon over time. This often occurs with a rapid increase in standing, walking, or running activities, particularly when the tendon has not been conditioned for the new workload. The tendon may become painful and irritable, and when it cannot provide its usual support, the arch can gradually collapse and the heel can drift outward. This changes how force travels through the foot and ankle and can contribute to joint irritation.
PTTD can also follow direct trauma to the tendon, such as a blow to the inside of the ankle, ankle or foot surgery, or a significant ankle injury that alters mechanics. Once symptoms start, the condition can become self-perpetuating: a flatter foot increases the demand on the tendon, and the tendon’s reduced capacity then allows the foot to flatten further.
Physiotherapists look for the specific reasons the tendon is overloaded. This can include calf tightness, stiff ankle or midfoot joints, weakness in the calf and foot stabilisers, poor single-leg balance control, footwear that does not support the arch, and training errors. Addressing these factors is a key part of long-term PTTD management and reducing recurrence.
How Is It Diagnosed?
PTTD is usually diagnosed through a combination of your history, a physical assessment, and sometimes imaging. A physiotherapist will ask about how symptoms started (often gradual), recent changes in walking or running load, and whether there has been an ankle injury or trauma. They will assess tenderness along the tibialis posterior tendon on the inside of the ankle, swelling, foot posture, and how the foot behaves during walking.
A key functional test is the single-leg heel raise. In early stages you may be able to rise onto your toes but it is painful or weak. In more advanced stages, it can be difficult or impossible, which can indicate reduced tendon function and a more progressed stage. Your physiotherapist will also look for signs of arch collapse, changes in heel alignment, and whether the deformity is flexible or becoming rigid.
Because other conditions can cause medial ankle pain, assessment also aims to rule out alternatives such as deltoid ligament injury, tarsal tunnel syndrome, midfoot arthritis, stress injury, or inflammatory arthropathy. If the presentation suggests a more advanced stage or joint involvement, your physiotherapist may recommend medical review and imaging to guide management.
Investigations & Imaging
- Ultrasound
- Can assess tendon thickening, inflammation, and tears, and may help confirm a tendon-dominant presentation.
- MRI
- Provides detailed assessment of tendon integrity and surrounding soft tissues, especially when a tear is suspected or symptoms are persistent.
- Weight-bearing X-ray (foot and ankle)
- Helps assess alignment and joint involvement in more advanced stages, including arch collapse and arthritic change.
Grading / Classification
- Stage I
- Tendon pain and swelling without visible deformity. The foot remains aligned, but the tendon is irritated and weaker.
- Stage II
- Flexible flatfoot deformity. The arch collapses and the heel may drift outward, but the foot is still flexible and correctable. Single-leg heel rise is often painful or difficult.
- Stage III
- Rigid flatfoot deformity with fixed joint changes. The foot is no longer easily correctable and arthritis may be present.
- Stage IV
- Progression with ankle involvement. Deformity and instability can affect the ankle joint, with more widespread pain and functional limitation.
Physiotherapy Management
Physiotherapy for PTTD is focused on reducing tendon overload, restoring tendon strength, and improving how the foot and ankle handle load during daily activity and sport. Management depends heavily on stage. In stage I and many stage II presentations, the goal is to calm pain and rebuild tendon capacity while supporting the arch so the tendon can recover. In later stages, physiotherapy is still important for maintaining function, managing pain, and supporting decisions about bracing and specialist review.
A physiotherapist will usually combine progressive strengthening, activity modification, and arch support strategies (taping, orthoses, braces, footwear changes). They will also address contributing factors like calf tightness, ankle stiffness, and balance deficits, because these can increase strain on the tibialis posterior tendon with each step.
Exercise
PTTD physiotherapy exercises are built around progressive tendon loading. Early on, your physiotherapist may start with isometric exercises that activate the tibialis posterior with minimal joint motion, such as pushing the forefoot inward (inversion) into resistance. This can reduce pain and begin rebuilding capacity without provoking a flare.
As symptoms settle, rehab typically progresses to slow, controlled strengthening through range. This may include resisted inversion and plantarflexion work, calf raises with careful foot alignment, and foot intrinsic strengthening that supports the arch. Your physiotherapist will often coach you to keep the arch gently lifted during strengthening, because collapsing into a flat position can increase tendon strain and reduce exercise quality.
Because PTTD often occurs alongside calf weakness, balance deficits, and reduced hip control, your program frequently includes single-leg balance drills, step-down control work, and hip strengthening. Later-stage rehab may include more functional strengthening such as walking tolerance progressions, controlled heel raise variations, and return-to-run drills if appropriate. Your physiotherapist will guide symptom rules so you strengthen the tendon without repeatedly aggravating it.
Activity Modification
Load management is one of the main pillars of PTTD recovery. When a tendon is irritated, its capacity to tolerate load is reduced. If you continue with the same volume of standing, walking, or running, symptoms often persist or worsen. The goal is to taper load enough for the tendon to settle, while still maintaining overall function and beginning strengthening so the tendon becomes more resilient.
Your physiotherapist will help you identify the activities that most overload the tendon, such as long walks, hills, uneven surfaces, and prolonged standing. Load management may involve temporarily reducing these triggers, changing surfaces, breaking standing time into blocks, or substituting cardiovascular exercise with cycling or swimming while the tendon settles.
A key part of physiotherapy is avoiding the trap of under-loading and overloading. Too little load can lead to deconditioning, while too much keeps the tendon reactive. Your physiotherapist will give you practical guidance on pacing and how to progress without flare-ups.
Manual Therapy
Manual therapy can help create a better mechanical environment for the tendon to recover and strengthen. In PTTD, physiotherapists commonly address calf tightness and ankle or midfoot joint stiffness, because these can alter gait mechanics and increase strain through the medial arch.
Manual therapy may include joint mobilisation to improve ankle dorsiflexion and midfoot mobility, and soft tissue techniques to reduce calf and foot muscle tension. If big toe stiffness is present, improving toe mobility can reduce compensations that overload the medial arch during push-off. Manual therapy can also provide short-term pain relief, making it easier to walk and complete strengthening exercises.
These techniques are most effective when paired with exercise therapy and arch support strategies, because lasting improvement requires better load tolerance and movement control.
Postural Retraining
Postural retraining for PTTD usually means retraining how you stand and walk so load is shared more evenly through the foot and lower limb. Many people with PTTD collapse inward through the arch and ankle during single-leg stance, particularly when fatigued. This increases strain on the tibialis posterior tendon.
Your physiotherapist may coach strategies such as improving single-leg alignment, reducing excessive pronation during gait, and improving hip and knee control so the foot does not have to compensate. For runners, retraining can include cadence or step-width changes and a graded return to impact, because returning too quickly to hills and uneven trails is a common trigger for recurrence.
These changes are practical and specific. The aim is not to “walk perfectly”, but to reduce repeated tendon overload across your normal day and training week.
Bracing & Taping
Supporting the arch is often essential in early-stage PTTD rehab, because the tibialis posterior tendon is painful and cannot provide its usual support. A physiotherapist may use taping as a short-term strategy to lift the arch and reduce tendon strain during walking and work. Taping is also useful as a trial to see whether arch support improves symptoms before investing in longer-term devices.
Orthotics and braces can be very helpful, but they must be selected carefully. Some people respond well to a supportive in-shoe orthotic that reduces pronation and unloads the tendon. Others require an ankle-foot orthosis or a more supportive brace, particularly in stage II presentations where deformity is present but still flexible. If symptoms are severely aggravated, a CAM boot may be recommended temporarily to allow comfortable walking and to calm a strong flare, while a long-term strengthening plan is started.
Your physiotherapist will guide selection, fitting, and progression so you do not become reliant on supports and so strengthening continues to improve the tendon’s own capacity.
Dry Needling
Dry needling may be used as an adjunct in PTTD when calf and foot muscle tightness is contributing to pain sensitivity and poor mechanics. It is not a primary treatment for tendon recovery, but in selected cases it can reduce muscle guarding and improve tolerance to exercise-based rehab. It is typically used alongside strengthening, mobility work, and arch support strategies.
Heat & Ice
Ice can be useful for symptom relief when the tendon is reactive after standing or walking. Many people with PTTD find short ice applications help settle pain during early flare-ups. Heat is sometimes used for calf stiffness, particularly if stiffness is contributing to compensatory foot loading, but it is not a stand-alone treatment for tendon overload.
Tens
TENS may be used as a short-term pain relief option when PTTD pain is limiting walking or sleep. In physiotherapy, it is typically used to support activity and exercise participation, rather than replacing progressive strengthening and load management.
Education
Education is central to PTTD physiotherapy. Your physiotherapist will explain what stage your presentation most resembles, what activities overload the tendon, and how to pace your recovery. This includes guidance on footwear, why uneven surfaces flare symptoms, and how to build walking tolerance without causing next-day worsening.
Education also covers what improvement should look like. Many people expect pain to vanish quickly, but tendons usually improve with consistent loading and gradual progress. Your physiotherapist will give you symptom rules so you know what discomfort is acceptable and what indicates the tendon was overloaded.
If signs suggest a more advanced stage, education also includes clear advice about the value of bracing and when specialist review is appropriate.
Other
Other management may include footwear education and a return-to-work plan for people who stand all day. Some people benefit from swapping flexible shoes for more supportive, stiffer footwear to reduce midfoot collapse during walking. Your physiotherapist may also provide conditioning alternatives, such as cycling, swimming, or deep-water running, so you maintain fitness while impact is limited.
If there are signs of rapid progression, significant deformity, or suspected tendon rupture, your physiotherapist will coordinate imaging and referral to an ankle and foot specialist while still helping you stay as functional as possible.
Other Treatments
Other treatments for PTTD may include short-term pain relief advice from a GP, and in some cases temporary immobilisation in a boot to settle a severe flare. Devices such as orthoses and braces are often considered part of conservative management and can be critical in reducing tendon load while strengthening progresses.
Injection therapy is not a routine first-line treatment for PTTD, and corticosteroid injections around tendons can carry risks. If injections are being considered for associated joint inflammation or other diagnoses, this should be discussed with your GP or specialist, with physiotherapy continuing as the foundation of long-term recovery.
Surgery
Surgery may be recommended when PTTD has progressed and conservative care is no longer appropriate, particularly in later-stage deformity and arthritis. Surgical options vary depending on the stage and may include tendon procedures, osteotomies (bone cuts to realign the foot), ligament reconstruction, or fusion procedures (arthrodesis) when joints are arthritic and deformity is rigid.
Even when surgery is required, physiotherapy remains important. Before surgery, physiotherapists can help maintain cardiovascular fitness and leg strength without worsening symptoms. After surgery, post-operative physiotherapy helps restore mobility where appropriate, rebuild strength, retrain gait, and guide a safe return to daily activity and work within the surgeon’s restrictions.
Prognosis & Return to Activity
Prognosis depends on stage, how long symptoms have been present, and how effectively contributing factors are addressed. Early-stage PTTD often responds well to conservative management when load is modified and the tendon is progressively strengthened. Many people can return to normal walking and exercise when they follow a structured PTTD rehab plan.
Later-stage PTTD with fixed deformity and arthritis can be more complex. Physiotherapy can still improve function and pain, but bracing and specialist input may be required. A key predictor of better outcomes is early recognition, because progressive collapse places increasing stress through joints and can lead to long-term limitation if not addressed.
Return to running or sport is generally guided by function-based milestones, including improved single-leg strength, improved heel raise capacity, stable walking mechanics, and minimal symptom flare within 24 hours of activity progression. Your physiotherapist will help plan this progression realistically and safely.
Complications
- Progressive arch collapse and worsening flatfoot deformity if tendon overload continues.
- Lateral foot pain from joint compression as the heel drifts outward.
- Midfoot or hindfoot arthritis with stiffness and reduced walking tolerance.
- Ankle involvement and instability in advanced progression, sometimes requiring more complex management.
Preventing Recurrence
- Increase walking and running gradually. Avoid sudden spikes in volume, hills, or uneven surface training that can overload the tibialis posterior tendon.
- Maintain calf strength and tibialis posterior strength with ongoing exercises prescribed during PTTD rehab, especially if you have a history of recurrence.
- Wear supportive footwear for long walking days. Flexible, worn-out shoes can allow the arch to collapse and increase tendon strain.
- Address calf tightness and ankle mobility early. Stiffness can force compensations through the arch and increase medial tendon load.
When to See a Physio
- If you have persistent pain on the inside of the ankle that is not improving after 1 to 2 weeks of basic self-management.
- If you notice your arch flattening, your heel drifting outward, or your foot rolling in more over time.
- If you cannot do a single-leg heel raise due to pain or weakness, as this can indicate reduced tendon function.
- If symptoms are significantly limiting walking for work or daily life, as early physiotherapy can reduce progression risk.