Soft tissue/bursa on the ankle joint

Anatomy: Soft tissues and bursa at the ankle joint

Bursae are small, fluid-filled cushions that lie where tendons slide over bones or where pressure and friction arise. On the hindfoot (heel), two bursa are particularly clinically relevant: the retrocalcaneal bursa between the Achilles tendon and the heel bone and a more superficial bursa in the area of ​​the heel cap (often referred to as the subachilleal or subcutaneous calcaneal bursa). In addition, soft tissue structures such as tendon sheaths of the peroneal tendons (outside), the tibialis posterior (inside) and the flexor hallucis longus (inside back), the retinacula (retaining ligaments of the tendons), the Kager fat body and the tissue in the sinus tarsi (lateral rear foot canal between the ankle and heel bone) also play a role.

• Retrocalcaneal bursa: Deep bursa between the Achilles tendon and the heel bone.
• Subachilleal/subcutaneous bursa: Superficial bursa behind the heel under the skin.
• Tendon sheaths: sliding bearings for tendons (e.g. peroneal tendons, tibialis posterior).
• Retinacula: Retaining ligaments that hold tendons close to the bone.
• Sinus tarsi: Canal on the lateral hindfoot, rich in ligamentous and synovial tissue, potential source of pain.

These structures work together to enable movement efficiently and painlessly. However, overuse, misalignment, shoe pressure or injuries can cause irritation and inflammation (bursitis, tendovaginitis, sinus tarsi syndrome).

Typical complaints and warning signs

• Heel pain behind the heel bone, pressure pain on the heel cap or between the Achilles tendon and the bone
• Swelling, redness, feeling of warmth over the back of the heel
• Starting pain after rest, increasing discomfort when walking and running, climbing stairs or standing on your toes
• Pain due to hard heel shaft of the shoe, pressure points
• Lateral hindfoot pain on uneven terrain or when twisting an ankle (sinus tarsi)
• Pain when moving or snapping phenomena along the tendons (tendon sheath irritation)

Warning signs that should be clarified by a doctor: rapidly increasing redness/warmth, pain at rest at night, significant restriction of movement, fever, trauma with persistent inability to exercise. With such signs, a rare bacterial bursitis, a tendon injury or a bony problem must also be considered.

Causes and risk factors

It is usually caused by a combination of mechanical irritation and individual disposition. Common triggers are:

• Increased load when running/sports, lots of uphill sections, sprints
• Shoe pressure caused by hard heel caps or poor fit
• Haglund configuration (bone-focused heel trailing edge) with mechanical conflict
• Foot misalignments (arch arches), leg axis or gait changes
• Ligament instabilities after twisting trauma (promoting sinus tarsi syndrome)
• Soft tissue irritation after sprains with remaining tendency to swell
• Systemic inflammation (e.g. rheumatic diseases, gout) involving the bursa and tendon sheaths
• Rare: Infections of the bursa, skin injuries with entry of germs

A targeted analysis of stress patterns, footwear and biomechanics helps to find the cause and prevent relapses.

Diagnostics in practice

The diagnosis begins with anamnesis (time course, stress, shoes, previous illnesses) and a structured clinical examination: localization of the pressure pain, examination of the Achilles tendon, function of the peroneal tendons and tibialis posterior, stability of the ankle joint, tests of the sinus tarsi.

• High-resolution ultrasound: detection of bursal effusion, thickening, hypervascularization (Doppler), assessment of tendons and tendon sheaths - dynamically while moving.
• Lateral x-ray: assessment of the heel bone (Haglund configuration, bony prominences), exclusion of gross bony causes.
• MRI (in unclear or treatment-resistant cases): Detailed representation of soft tissues, Kager fat bodies, sinus tarsi, possible partial tears of the tendons or bone edema.
• Laboratory (selective): If systemic inflammation or gout is suspected.

Imaging complements the clinical assessment. Not every deviation in the image is causal; What is crucial is the connection with the symptoms.

Conservative therapy – initially and usually sufficient

The majority of soft tissue and bursa problems in the ankle joint can be controlled with conservative measures. The aim is to reduce stimuli, gradually control stress and correct triggering factors.

• Load adjustment: temporarily reduce running/jumping, switch to bike or swimming-based units, avoid running uphill.
• Cooling in the acute phase (10–15 minutes, several times a day, pay attention to skin protection).
• Shoe modification: Soft/cut out heel cap, sufficient space in the heel area, change of model if necessary.
• Heel wedge (5–10 mm) for short-term relief of the Achilles tendon and the retrocalcaneal area.
• Insoles for misalignment (e.g. medial support for arched arches), stable shoes if necessary.
• Physiotherapy: Gentle mobilization, stretching of the calf muscles, later eccentric calf muscle training (after the acute irritation has subsided), coordination/proprioception for hindfoot control.
• Taping/Orthoses: Temporary guidance of the rear foot or protection against shoe pressure.
• Anti-inflammatory painkillers for a short time and only if tolerated - consider individually with your doctor.
• Ultrasound-assisted infiltration of the bursa (e.g. local anesthetic; corticosteroid only conservatively, not into the Achilles tendon).
• Puncture/relief for severe bursa effusion – under sterile conditions.

Cortisone injections can reduce symptoms in the short term, but carry an increased risk of tendon irritation at the Achilles tendon base. They should be sonographically targeted, low-dose and not intratendinous. The decision is made individually and based on information.

Regenerative procedures – selective indication

Regenerative therapies can be considered for chronic, therapy-resistant disease. The data situation varies depending on the structure and should be discussed transparently.

• PRP (Platelet-Rich Plasma): Moderately studied option for Achilles tendon problems; limited evidence for isolated retrocalcaneal bursitis. Use after exhausting the standard measures and individual benefit-risk assessment.
• Shock wave therapy (ESWT): Often used for Achilles tendon insertion problems; Inconsistent data for pure bursitis. To be considered if there is mechanical involvement of the approach.
• Manual/targeted training concepts: Progressive, symptom-controlled load management with eccentric components, combined with shoe/insole optimization.

None of these procedures guarantee a cure. We only recommend therapies whose opportunities and limitations match the individual situation.

Surgical options – rarely required

Operations are considered if, despite consistent conservative treatment over several months, relevant limitations persist or a mechanical conflict situation persists.

• Endoscopic/Open Bursectomy: Removal of a chronically inflamed bursa if pain symptoms persist.
• Endoscopic calcaneoplasty for Haglund configuration: removal of bony protrusions to relieve pressure on the Achilles tendon sliding surface.
• Subtalar/sinus tarsi arthroscopy: diagnosis/therapy for chronic sinus tarsi syndrome.
• Accompanying procedures: Correction of addressable misalignments in collaboration with foot surgery (selective).

The decision is individual, depending on the findings, imaging, functional requirements and previous illnesses. Realistic information about the benefits, risks and follow-up treatment is essential.

Course, healing times and relapse prevention

Acute irritation of the bursa often improves within a few weeks, while chronic symptoms often take several months. The decisive factors are consistent reduction of stimuli, adequate control of stress and avoiding further mechanical provocation.

Self-help: Dos and Don’ts in the acute phase

• Do: Use a soft heel cap, heel wedge if necessary; Temporarily reduce the amount of training.
• Do: Short cooling intervals, elevate after exercise.
• Do: Gently stretch the calf muscles without provoking pain.
• Don’t: Hard heel edges, tight shoes, mountain sprints or jump training.
• Don’t: Self-inject or aggressive stretching techniques at the peak of pain.
• Do: Get a professional assessment early if there are any warning signs.

Subpages at a glance

The following subpages are available for detailed information on specific soft tissue and bursa diseases of the ankle joint:

• Sinus tarsi syndrome: Lateral hindfoot pain after twisting the ankle or in the event of instability - diagnostics, conservative therapy, selective arthroscopy.
• Retrocalcaneal bursitis: Inflammation of the deep bursa between the Achilles tendon and the heel bone - causes, imaging, therapy paths.
• Subachillary bursitis: Superficial bursitis on the heel counter - shoe pressure, skin protection, local measures.
• Soft tissue irritation after sprains: Persistent swelling and sensitivity after distortion - rehabilitation and stability building.

In addition, you will find ankle joint-related overviews of ligaments, cartilage/joint, bone/structure, systemic causes, overload and trauma.

Your appointment in Hamburg-Winterhude

We specialize in conservative orthopedics with modern diagnostics (including high-resolution ultrasound). Together we will develop an individual treatment plan that is suitable for everyday use and sports – clearly structured and without unnecessary interventions. You can find us at Dorotheenstraße 48, 22301 Hamburg. You can easily request appointments online or by email.