Osteoarthritis of the Foot: Preserving Joint Mobility and Reducing Pain

What lies behind it

The human foot is a complex masterpiece of biomechanics. With every step, it absorbs a multiple of one's own body weight. The first metatarsophalangeal joint, known in medical terminology as the Articulatio metatarsophalangea prima, plays a key role here. It bears the main load of the forefoot during the natural rollover movement. In osteoarthritis of the foot joints, above all Hallux rigidus, progressive wear occurs in the hyaline cartilage layer that covers and protects the joint.

Due to continuous abrasion, the cartilage loses its smooth structure and cushioning function. The cartilage layer becomes thinner, causing the visible joint space on X-rays to narrow continuously. The underlying bone reacts to this increased mechanical pressure with a density increase known as subchondral sclerosis. To distribute the increased load over a wider area, the body forms bony outgrowths at the joint margins. In Hallux rigidus, these so-called osteophytes develop primarily on the top side of the metatarsal head.

These bony outgrowths act like a mechanical latch. As soon as the hallux is meant to flex upwards during walking, the proximal phalanx of the toe strikes the osteophytes. Physiological extension, known as dorsal extension or dorsiflexion, is thus severely restricted or blocked. In addition to the first metatarsophalangeal joint, the tarsal joints, the Lisfranc joint line or the subtalar joint can also be affected by osteoarthritic changes. The harmonious interplay of tendons, muscles and bones is gradually disrupted as a result.

Typical symptoms

The onset of foot osteoarthritis usually announces itself insidiously. The first sign is frequently a pronounced start-up pain. After prolonged periods of rest or in the morning after getting up, the affected joints feel stiff and painful. Only after a few minutes of loading does the remaining synovial fluid distribute within the joint cavity, whereupon the discomfort temporarily decreases.

A very distinctive symptom of Hallux rigidus is the formation of a hard bump on the dorsal forefoot. This dorsal exostosis is easily palpable and often causes the shoe to press onto the joint from above. Redness, pressure points and painful bursitis occur. As joint space narrowing progresses, the mobility of the hallux decreases further until rolling over the first ray becomes impossible.

To avoid pain, patients unconsciously shift weight to the outer edge of the foot. Although this supination gait relieves the first metatarsophalangeal joint, it leads to severe maldistribution of load on the remaining foot structures. This compensatory movement frequently causes calluses beneath the heads of the middle metatarsals and overload pain in the region of the peroneal tendons.

In differential diagnosis, foot osteoarthritis must be distinguished from other clinical conditions. Unlike osteoarthritis, acute gouty arthritis is more sudden, usually accompanied by extreme redness, swelling and tenderness. Hallux valgus differs in that the hallux deviates laterally, whereas in pure Hallux rigidus the axis remains straight while the joint stiffens. Morton's neuroma in the midfoot or stress fractures also require precise differentiation, as they demand a completely different therapeutic approach.

Causes in everyday life

The development of osteoarthritis in the foot is rarely based on a single cause. In most cases, biomechanical malalignments, chronic overload and individual risk factors interlock. Foot deformities such as splayfoot or flatfoot fundamentally alter the pressure distribution in the forefoot. The arch collapses, forcing the first metatarsophalangeal joint into an unnatural position with every step.

Everyday footwear exerts a significant influence on foot health. Shoes with a toe box that is too narrow compress the toes and restrict freedom of movement. High heels shift the entire body weight forward onto the forefoot, multiplying the mechanical pressure on the metatarsophalangeal joints. Extremely soft or flexible soles lacking inherent stability are equally problematic. They require maximum flexion from the first metatarsophalangeal joint with every step, which additionally strains an already irritated joint.

Previous injuries also play a central role in its development. Sprain trauma to the toe, micro-tears in the joint capsule or unnoticed fractures not infrequently lead to post-traumatic osteoarthritis years later. Years of overload from sports involving abrupt stopping movements or occupational activities on hard industrial floors also contribute to premature wear.

Metabolic disorders and chronic inflammatory underlying diseases further accelerate cartilage breakdown. Finally, inadequate foot care indirectly leads to abnormal loading. When affected individuals try to spare painful corns or ingrown nails while walking, they alter their gait pattern. This antalgic posture subjects the foot joints to permanent maldistribution of load.

When medical evaluation is necessary

Conservative and podiatric management of foot osteoarthritis requires a sound medical diagnosis. Prompt examination by an orthopaedic surgeon or trauma surgeon is necessary if the joint suddenly swells severely, becomes significantly warm or turns intensely red. These symptoms point to activated osteoarthritis involving an inflammatory effusion in the joint space, or an infectious joint inflammation.

Persistent rest pain and nocturnal pain represent a clear warning sign. They signal that the bone beneath the damaged cartilage is subjected to considerable stress or that severe capsular irritation is present. If sudden sensations of catching or painful blockages make walking impossible, loose joint bodies or obstructive osteophytes must be evaluated.

The physician usually confirms the diagnosis using weight-bearing X-rays. On the X-ray image, the extent of joint space narrowing, subchondral sclerosis and the location of bony outgrowths can be assessed precisely. Additionally, magnetic resonance imaging may be required to visualize the condition of soft tissues, cartilage remnants and potential bone marrow oedema. Only on this diagnostic foundation can an individualized treatment plan be created.

What podiatric treatment can achieve

Podiatry plays an important role in the treatment and management of patients with foot osteoarthritis. The goal of podiatric work is to reduce painful pressure peaks, prevent secondary skin damage and make walking as symptom-free as possible. A detailed overview of treatment options can be found under our /en/services.

At the centre of medical foot care is the professional removal of hyperkeratosis and calluses. Due to altered biomechanics and compensatory gait, osteoarthritis patients increasingly develop hyperkeratoses, particularly beneath metatarsal heads II to IV or at the outer foot margin. If these calluses are not removed regularly and precisely, they act like a foreign body beneath the skin. They increase pressure on the underlying tissue and intensify pain.

An essential component of podiatric care is the fabrication of custom pressure and friction protection devices made from medical silicones. These custom-made silicone orthoses are fitted precisely to the patient's anatomy. They shield sensitive bony outgrowths on the dorsal aspect of the hallux from friction caused by shoe leather. This effectively prevents painful blisters, pressure points and bursal irritation.

Furthermore, podiatric care includes sound advice on shoe selection, orthopaedic insoles and relieving rollover aids. The regular treatment interval is usually between four and six weeks. This allows changes in the foot to be detected early and measures to be adjusted. Additionally, in the case of inflammatory activated osteoarthritis, cold therapy in the /en/cryotherapy can be utilised to relieve pain and dampen inflammatory responses in the tissue.

What you can do yourself

Consistent self-initiative is crucial to maintaining joint mobility in the feet and positively influencing the course of the disease. Targeted use of everyday measures and movement exercises can relieve pain and increase the load capacity of the foot.

The most important everyday measure concerns the choice of proper footwear. Ensure shoes have a sufficiently wide toe box that offers enough space for the toes. The sole should not be overly flexible in the forefoot area, but rather feature a stiffener. Shoes with an integrated rollover aid, such as a ball roller or midfoot roller, are ideal. This special sole shape automatically guides the foot across the ground during walking without requiring the first metatarsophalangeal joint to flex.

Instructions for daily mobilization and care:

1. Traction and gentle mobilization: Sit down comfortably and place the affected foot onto the thigh of the opposite leg. Enclose the midfoot with one hand and the proximal phalanx of the hallux with the other. Pull the toe very lightly longitudinally forward to gently decompress the joint, and move it very carefully within the pain-free range.
2. Activation of the foot musculature: While seated, attempt to lift the arch of the foot by pressing the ball of the hallux, the ball of the little toe and the heel firmly onto the ground without clawing the toes. This exercise strengthens the short foot muscles and stabilizes the arch.
3. Rolling out the plantar fascia: Roll the sole of the foot slowly with a small fascia ball or massage roller for about three minutes every day. This releases adhesions in the connective tissue and reduces tension on the tendon insertions.

Additionally, temperature-controlled self-treatment is recommended. In acute pain and localized heat, cool compresses have an anti-inflammatory effect. In symptom-free phases, warm foot baths promote blood circulation and loosen muscular tension in the foot and lower leg muscles.

Common mistakes

In practice, certain behaviors regularly accelerate the wear process unintentionally. The most common mistake is complete immobilization of the foot out of fear of pain. Lack of movement significantly worsens the nutrient supply to the cartilage. Cartilage tissue has no blood vessels of its own and is nourished exclusively through the alternation of pressure and relief via the synovial fluid. Anyone who stops moving the foot accelerates the death of cartilage cells.

Another serious mistake is wearing unsuitable footwear despite a known diagnosis. Very soft, flexible barefoot shoes or running shoes with highly flexible soles are often mistakenly rated as comfortable. However, they force the damaged first metatarsophalangeal joint into maximum deflection with every step, leading to irritation of the joint capsule. Equally harmful are worn-out shoes with soles worn down on one side, as they reinforce malalignments.

Many patients also tend to suppress pain permanently with painkillers without adjusting their gait or footwear. Suppressing the pain warning signal leads to further overloading of the joint in daily life. In addition, attempting to pare down calluses independently and improperly with sharp blades carries high risks of injury and frequently leads to deep infections of damaged tissue.

Current state of research and classification

Medical research in recent years has clearly demonstrated the efficacy of conservative therapeutic approaches in foot osteoarthritis and Hallux rigidus. The staging system developed by Coughlin and Shurnas classifies Hallux rigidus into grades 0 to 4 [1]. While surgical procedures must often be considered in advanced stages 3 and 4, conservative therapy takes center stage in stages 1 and 2.

Biomechanical studies show that structural limitations of the first ray alter pressure distribution beneath the entire sole of the foot [2]. Stiffening of the first metatarsophalangeal joint leads to a measurable increase in peak loads beneath metatarsal heads II and III. This confirms the clinical observation that untreated hallux osteoarthritis provokes compensatory movements and secondary pain in the forefoot.

Clinical studies on the efficacy of shoe modifications prove the benefit of rigid sole constructions combined with rollover aids [3]. By using rigidus springs or specially shaped ball rollers, the load on the first metatarsophalangeal joint during the stance phase was significantly reduced. This leads to a noticeable reduction in pain during walking.

In the current S2k guideline of orthopaedics, it is emphasized that the combination of podiatry, targeted physiotherapy and orthopaedic insole provision can effectively relieve symptoms [4]. Surgery should only be considered when conservative options have been fully exhausted and impairment in daily life persists.

Treatment in Memmingen

In our practice /en/practice in Memmingen, we dedicate ourselves to the health of your feet with professional precision and personal care. Whether you come to us from Unterallgäu, Upper Swabia or directly from the Allgäu region, the team led by owner Helga Maria Freitag provides expert management for complaints caused by foot osteoarthritis. As a state-recognised podiatrist and sectoral practitioner for podiatry (sektorale Heilpraktikerin), she combines sound podiatry with comprehensive consultation.

We examine your rollover pattern, identify painful pressure points and, if required, fabricate custom-fitted silicone orthoses to relieve bony outgrowths. Coordination with attending medical specialists is also part of our care approach. You will find FREITAG® Podologie GmbH at Kempterstr. 25 in 87700 Memmingen. You can arrange an appointment via our /en/contact page to permanently safeguard your ability to walk and your quality of life.

Orthopaedic shoe technology provisions

If manual mobilization is no longer sufficient to relieve joint pain during walking, orthopaedic shoe technology offers effective biomechanical relief mechanisms. The primary focus is on targeted immobilization or partial offloading of the first ray while largely maintaining step roll-through. A core element is the so-called rigidus insole, which is manufactured with an integrated carbon or plastic stiffener. This 1.0 to 1.5 millimetre thin stiffening plate extends from the heel to beneath the hallux pad. It prevents painful bending in the first metatarsophalangeal joint during the toe-off phase of the foot.

In addition to insole provision, direct shoe modifications are used. An orthopaedic ball roller shifts the crest of the sole curvature slightly backward behind the metatarsal heads. The foot thus rolls off passively without requiring the toe joints to flex. In severe pain around the tarsus, a butterfly roller with a cutout beneath sensitive bone structures can be crafted. A case from clinical practice illustrates the effect: A 54-year-old female patient from the Mindelheim area had suffered for two years from load-dependent pain over distances exceeding two kilometres. Following the fitting of individually modelled carbon insoles combined with a slightly raised fit, her pain-free walking distance improved significantly within four weeks. However, such provisions must always be matched precisely to the shoes worn, as uppers that are too tight increase pressure on bony outgrowths.

Physical and injection-based therapies

In conservative orthopaedics, various focused procedures are available to mitigate local inflammatory reactions and temporarily stabilize joint function. Intra-articular injection therapy is primarily used when pain intensity limits the scope of exercise therapy. Highly cross-linked hyaluronic acid is injected directly into the remaining joint space. It increases the viscosity of the remaining synovial fluid and improves shock absorption between worn cartilage surfaces. Typical treatment cycles comprise two to three injections at weekly intervals.

As a biological alternative, therapy with autologous conditioned plasma, PRP for short, is gaining importance. A small amount of venous blood is collected from the patient, centrifuged and introduced in processed form into the affected foot joint. The growth factors and cytokines contained within can dampen inflammatory processes in the synovial membrane. In painful tendon insertion irritations or accompanying inflammation of the plantar fascia, focused extracorporeal shockwave therapy also demonstrates good success. Three treatment sessions at weekly intervals stimulate local tissue metabolism and promote microcirculation. Should these procedures fail to yield sufficient symptom reduction, orthopaedic deep X-ray therapy can be considered, in which low-dose X-rays dampen chronic inflammation in the tissue.

Surgical treatment options

If conservative and podiatric measures exhaust therapeutic possibilities and pain levels in daily life remain high, sophisticated surgical procedures are available. The decision for the appropriate intervention depends on the extent of cartilage damage and the stage of the disease. In Coughlin stages 1 to 2, cheilectomy represents the standard procedure. In this joint-preserving procedure, the surgeon removes only the obstructive bony outgrowths on the dorsal aspect of the hallux and approximately one-third of the metatarsal head. Joint mechanics are thereby freed, immediately improving mobility of the hallux and relieving pressure on shoe leather.

In advanced osteoarthritis in stage 3 or 4 with almost complete loss of cartilage, arthrodesis of the first metatarsophalangeal joint is considered the reliable standard. Here, the damaged joint surfaces are excised and the involved bones are rigidly fused using screws or a plate. Despite targeted fusion, a smooth gait pattern is maintained, as the adjacent joints of the tarsus and interphalangeal joint largely take over the rollover movement. Following surgery, patients wear a special offloading shoe with a rigid sole for six to eight weeks. In the subsequent rehabilitation phase, podiatric follow-up care plays an essential role. Scarring in the incision area must be mobilized and skin margins gently cared for to avoid secondary pressure points caused by altered footwear.