Bursitis of the foot
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Inflammation of the synovial bursa of the foot, referred to as bursitis, is a painful condition of the tissues that reduce friction between bone, tendon, ligament, skin, or other soft structures. In the foot, there are anatomical bursae, which possess a synovial lining, and adventitious bursae, which form at sites of chronic pressure. The inflammatory process may involve the heel region, the forefoot, the spaces between the metatarsal bones, or bony prominences near the big toe and the little toe. Typical symptoms include localized pain, tenderness, swelling, and reduced walking tolerance. The basis of effective management is identifying the type of bursa, the cause of overload, and coexisting conditions, as similar complaints can result from, among other things, tendinopathy, a stress fracture, arthritis, or nerve compression.
Foot bursitis - where does it come from
A bursa is a small, fluid-filled space whose function is to reduce friction and distribute pressure. Under repetitive stress, irritation of its wall occurs, accompanied by increased vascular permeability and the accumulation of inflammatory fluid. A chronic process can lead to wall thickening, fibrosis, and the formation of a painful tissue mass.
Within the foot, several clinically significant locations are distinguished:
- retrocalcaneal bursa, located between the anterior surface of the Achilles tendon and the calcaneus;
- subcutaneous calcaneal bursa, developing between the skin and the posterior part of the calcaneus;
- intermetatarsal bursae, located in the spaces between the metatarsal heads;
- submetatarsal bursae, forming under the metatarsal heads in areas of increased pressure;
- adventitious bursae at the great toe or little toe, often associated with hallux valgus or a bunionette deformity.
The most common mechanism is the accumulation of mechanical microtrauma. It is promoted by tight footwear, a stiff heel counter, high heels, a sudden increase in training volume, prolonged walking, and standing work. Biomechanical disorders also play a role, such as excessive pronation, limited ankle dorsiflexion, pes cavus, toe deformities, plantar fat pad atrophy, and abnormal plantar pressure distribution.
Forefoot bursitis is more frequently associated with rheumatoid arthritis. Less common causes include gout, other inflammatory arthropathies, direct trauma, and infection following skin damage, an injection, or a procedure.
Foot bursitis - how to recognize
The clinical picture depends on the location of the lesion. Pain usually worsens with pressure, walking, and wearing certain footwear. It may be burning, bursting, or stabbing in nature. Over a superficially located bursa, a palpable thickening, swelling, and increased tenderness appear.
Characteristic features of individual forms include:
- retrocalcaneal bursitis: pain anterior to the Achilles tendon, aggravated by dorsiflexion of the foot and pressure from the back of the shoe;
- subcutaneous calcaneal bursitis: tenderness directly under the skin of the posterior surface of the heel;
- intermetatarsal bursitis: forefoot pain, a sensation of a foreign body, sometimes splaying of adjacent toes;
- submetatarsal bursitis: point tenderness under the metatarsal head, often coexisting with a callus;
- bursa associated with hallux valgus: redness, swelling, and pain over the medial eminence of the first metatarsal head.
Diagnosis is based on medical history, foot examination, assessment of footwear, range of motion, limb axis, and gait pattern. Palpation helps determine whether the source of pain is a bursa, tendon, joint, bone, or nerve.
High-resolution ultrasound allows the assessment of the contents, walls, and vascularity of the bursa. It also facilitates distinguishing intermetatarsal bursitis from Morton's neuroma. Magnetic resonance imaging is used in cases of an inconclusive picture, suspected plantar plate injury, stress fracture, inflammatory disease, or extensive soft tissue pathology. Weight-bearing radiographs demonstrate bony deformities and foot alignment.
Rapidly increasing redness, warmth, throbbing pain, a wound, fever, or deterioration of the general condition require urgent medical evaluation. If infection or gout is suspected, the doctor may collect fluid for microbiological testing and crystal analysis.
Foot bursitis - what worsens symptoms
The exacerbation of symptoms results primarily from maintaining pressure on the affected area. Each step repeatedly compresses the bursa between adjacent structures, sustaining the local inflammatory response.
The key exacerbating factors include:
- shoes with a narrow toe box, hard seams, or a rigid heel counter;
- high heels shifting body weight onto the metatarsal heads;
- uphill running, sprints, jumping, and training on hard surfaces;
- a rapid increase in the distance, intensity, or frequency of exercise;
- prolonged standing and walking without recovery breaks;
- walking barefoot on hard surfaces in the presence of fat pad atrophy;
- excess body weight increasing plantar pressure;
- foot deformities altering load distribution;
- limited ankle mobility and gastrocnemius muscle contracture;
- pressure, intense foam rolling, or deep tissue massage directly over an actively inflamed bursa.
In the case of the retrocalcaneal bursa, an additional factor may be impingement between the Achilles tendon and the prominent posterosuperior aspect of the calcaneus, known as Haglund's deformity. Forefoot symptoms, in turn, are sustained by hallux valgus, hammer toes, metatarsophalangeal joint instability, and overloading of adjacent rays of the foot.
Recurrent episodes despite offloading constitute an indication for re-evaluating the biomechanical or systemic cause.
Foot bursitis - how to treat
Treatment is tailored to the location, duration of symptoms, and cause of the inflammation. The first stage includes temporary load reduction, cooling through a cloth, limb elevation, and changing footwear. Soft heel pads, wedges, insoles, metatarsal pads, and gel protectors can be helpful. Their positioning should shift pressure away from the bursa, as direct pressure usually increases pain.
A doctor may recommend a topical or oral analgesic and anti-inflammatory medication, taking into account gastrointestinal, renal, and cardiovascular diseases, as well as concurrent medications. Treatment of the underlying condition is crucial in rheumatoid arthritis and gout.
Physiotherapy includes:
- gait and load distribution analysis;
- joint mobilization in the presence of coexisting mobility limitations;
- gradual stretching of the gastrocnemius and soleus muscles;
- strengthening of the foot and calf muscles as well as limb stabilizers;
- movement pattern re-education;
- unloading taping;
- controlled return to activity.
At Ambasada Urody Clinic & Spa, procedures are available that, following qualification, can support conservative treatment:
- physiotherapy and manual therapy, including soft tissue techniques, mobilizations, fascial therapy, therapeutic exercises, and kinesiotaping;
- manual therapy according to the Maitland concept, useful in coexisting ankle stiffness and limb mechanics disorders;
- INDIBA Elite NS Sport, a 448 kHz radiofrequency therapy used as a supplement to the rehabilitation of pain, overload, swelling, and inflammatory soft tissue changes.
For bursitis itself, evidence regarding 448 kHz radiofrequency remains more limited than for standard unloading treatment and rehabilitation. The procedure should be part of a physiotherapy plan, and its parameters need to be adjusted to the phase of the inflammatory process.
A glucocorticosteroid injection may provide short-term symptom relief in carefully selected cases. In the Achilles tendon area, the procedure requires particular caution due to the risk of tendon weakening and rupture. An infection requires antibiotic therapy and sometimes drainage. A persistent lesion associated with a bone deformity may require surgical treatment.
Foot bursitis - how to prevent recurrence
Prevention is based on permanent reduction of local friction and improving the foot's load-bearing capacity. Footwear should have appropriate width, cushioning, and a construction adapted to the location of the bursa. In case of pain in the posterior part of the heel, models with a soft heel counter or temporary use of open-back footwear can be beneficial.
Key measures include:
- increasing training loads in stages;
- introducing recovery days;
- selecting footwear according to the type of activity and foot anatomy;
- regular inspection of sole wear;
- performing exercises to strengthen the intrinsic foot muscles;
- maintaining adequate ankle joint mobility;
- correcting walking and running technique;
- applying individually tailored offloading in the presence of deformities;
- controlling body weight and inflammatory diseases;
- daily assessment of foot skin in individuals with diabetes or sensory impairment.
Return to sport should occur after a distinct resolution of tenderness and the restoration of pain-free walking. The load is increased gradually, observing the foot's response on the day of training and the following morning. Persistent pain, recurrent swelling, or gait disturbance indicate the need to reassess the diagnosis, footwear, and limb biomechanics.
