Tibialis Posterior Insufficiency (PTTD)

Anatomy: Role of the tibialis posterior tendon

The tibialis posterior muscle lies deep on the back of the lower leg. Its tendon runs behind the inner ankle in a tendon sheath, pulls forward under the longitudinal arch of the foot and attaches to several bones (including the scaphoid/os naviculare, sphenoid bones).

• Function: Stabilization of the medial longitudinal arch and support of supination in the lower ankle joint
• Synergies: Interaction with the peroneal tendons, the plantar fascia and the spring ligament (Lig. calcaneonaviculare plantare)
• Significance in gait: Eccentric and concentric control of the pronation/supination movement when rolling

If the tendon is weakened or damaged, the arch of the foot loses its active support system - ligaments and joints are overloaded.

What is Tibialis Posterior Insufficiency? Stadiums

Tibialis posterior insufficiency refers to a continuum from tendonitis to degenerative partial tears to structural insufficiency with misalignment of the foot. The deformity often develops gradually.

• Stage I: Tendinitis/tenosynovitis without structural tear, foot shape still normal
• Stage II: Tendon degeneration/partial tear with flexible arched arches and forefoot abduction (too many toes sign)
• Stage III: Arched arched foot that has become rigid, limited ability to correct
• Stage IV: Additional involvement of the upper ankle (valgus tilt, deltoid instability)

The classification helps to define therapy goals and treatment steps in a structured manner.

Typical symptoms

• Pain and swelling along the tendon behind/under the inner ankle
• Pain when walking, climbing stairs or standing for long periods of time
• Difficulty standing on tiptoe on one leg (single heel rise test)
• Progressive flattening of the arch of the foot, shoe wear on the inside
• Later: Outer ankle or lateral foot pain due to entrapment (sinus tarsi/peroneal tendon problems)
• Feeling of instability and rapid fatigue in the foot

Causes and risk factors

• Degenerative changes in the tendon in adulthood
• Overload caused by standing/walking for long periods of time, walking intensively downhill or doing sports that involve a lot of change of direction
• Rheumatoid arthritis and inflammatory rheumatic diseases
• Metabolic factors: diabetes mellitus, obesity, hypertension
• Forefoot or rearfoot misalignments, ligament laxity
• Previous injuries, tendon tightness
• Rare drug effects on tendon tissue; Get individual medical advice on this

Diagnostics in orthopedics

First of all, the focus is on the anamnesis and clinical examination. The assessment of gait, foot axis and tendon function is crucial.

• Inspection: arched arches, forefoot abduction, shoe abrasion
• Function: Single heel rise test, tiptoe stand, jack test (windlass)
• Palpation: tenderness along the tendon, swelling of the tendon sheath
• Axis and length measurements, leg length and calf muscle function (gastrocnemius)
• Imaging: X-ray while standing (axial parameters, talonavicular coverage), ultrasound for tendon slippage and defects, MRI for unclear findings/operation planning
• Differential diagnoses: tarsal tunnel syndrome, peroneal tendinopathy, plantar fasciitis, osteoarthritis of the lower ankle

Imaging complements clinical assessment, but does not replace it.

Conservative therapy: exhaust it first

In most cases, treatment begins non-surgically. The aim is to reduce inflammation, relieve pain and functionally stabilize the longitudinal arch.

• Load control: temporary reduction in running and jumping sports, walking breaks, terrain adaptation
• Cooling, short-term anti-inflammatory medication after medical consultation
• Taping/strapping for media support
• Short-term immobilization in a walker/orthosis in the event of acute irritation (stages I–II)
• Individual insoles with medial longitudinal arch support and heel guidance
• Physiotherapy: Strengthening the posterior tibialis and foot muscles, stretching the calf muscles, neuromuscular training
• Shoe advice: firm heel cap, sufficient volume, rocker sole if necessary
• Weight management and everyday training planning

Physiotherapy and exercises

Targeted exercises support the tendon and the medial longitudinal arch. The dosage should be adjusted depending on the stage and symptoms.

Pain may occur as a mild training stimulus, but should not increase persistently. If the condition worsens, please consult a doctor or physiotherapist.

Insoles, orthoses and shoes

Mechanical support relieves the tendon and can guide the axle. The selection depends on the stage, activity profile and footwear.

• Insoles: medial longitudinal arch support, heel cup, medial wedge if necessary
• UCBL-like insoles with high heel control for better control
• Ankle-foot orthoses (AFO) for stage II for axis guidance, removable for training
• Shoes: stable heel support, torsion-resistant sole, possibly rocker bottom to make rolling easier

Regenerative processes – where useful?

In cases of persistent tendinopathy without advanced deformity, regenerative procedures are discussed in individual cases.

• PRP (platelet-rich plasma): may be considered for selected tendinopathies; Evidence for the tibialis posterior tendon is limited
• Shock wave: helpful for some tendon problems, but heterogeneous data for PTTD
• Hyaluronic acid/sclerotherapy: not standard; Use on a case-by-case basis and after informed consent

These procedures do not replace the basic therapy of load control, insoles and targeted physiotherapy.

Surgical therapy: indications and procedures

Surgery is considered if relevant symptoms or a progressive deformity persist despite consistent conservative treatment over several months. The aim of the operation is to maintain function and reduce pain - depending on the stage.

• Stage I: Tenosynovectomy, debridement, if necessary tendon suturing for focal lesions
• Stage II: Reconstruction with FDL transfer (tendon replacement through flexor digitorum longus), medializing calcaneal osteotomy for axis correction
• Additions: Spring ligament reconstruction, Cotton osteotomy (medial wedge on the cuneiform bone) with forefoot supination component, lateral cleft extension if necessary
• Calf muscle lengthening (gastrocnemius recession) in cases of functional shortening
• Stage III–IV: Joint stiffening (e.g. subtalar or talonavicular arthrodesis, if necessary ankle joint stabilization) to reduce pain and provide stability

Follow-up treatment usually includes immobilization, controlled increase in load and physiotherapy. The specific protocol depends on the procedure and individual healing.

Course and prognosis

If detected early, the symptoms can often be controlled with conservative measures. If the misalignment is severe, the likelihood that surgical corrections will be necessary increases. The long-term course depends on the stage, comorbidities, compliance with physiotherapy and the provision of medical aids.

Everyday life, sport and prevention

• Dose activities with high pronation load; Use alternative forms of endurance (cycling, swimming).
• Warm up, progressive increase in training and regular calf/foot stretching
• Choose footwear appropriate to the situation; Wear insoles consistently
• Weight control helps relieve strain on the tendons
• If you are newly prescribed medication, discuss possible tendon risks with your doctor

Warning signs: When should you seek medical advice?

• Sudden collapse of the arch of the foot or significant axial deterioration
• Severe, persistent swelling, redness, or pain at rest
• Numbness, burning or nighttime pain in the foot (indication of nerve involvement)
• Fever or general symptoms
• Lack of improvement despite consistent basic therapy

Treatment in Hamburg: individual and evidence-based

In our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, we plan the treatment of tibialis posterior insufficiency individually depending on the stage and everyday requirements. The focus is on structured, conservative care with clear rehabilitation goals. Surgical options are only considered if indicated and after detailed information.

Bring existing images (X-rays, MRI) and insoles/shoes with you to the appointment - this way we can tailor the care in a targeted manner.