Foot & Ankle Tendonitis Michigan 2026 | Podiatrist

Tendon	Location	Function	Classic Mechanism	Hallmark Symptom	Key Exam Finding
Achilles (non-insertional)	Posterior calf, 2–7cm above heel	Plantarflexion + push-off	Running load increase, tight gastroc	Morning posterior ankle stiffness, fusiform swelling	Arc sign with ankle movement
Achilles (insertional)	At calcaneal insertion	Plantarflexion	Haglund’s impingement, direct pressure	Posterior heel pain with shoe back counter	Pain at palpation of insertion
Posterior Tibial	Behind medial malleolus → navicular	Arch support, inversion	Overuse, overpronation, obesity	Medial ankle pain, arch fatigue	Painful single-leg heel rise
Peroneal Brevis	Behind lateral malleolus → 5th base	Eversion, ankle stability	Inversion sprain, chronic instability	Posterior lateral ankle, 5th MTB tenderness	Pain with resisted eversion
Extensor Hallucis Longus	Dorsal foot, big toe	Toe/ankle dorsiflexion	Tight shoe lacing, shoe pressure	Dorsal foot pain with tight laces	Pain with resisted dorsiflexion
Flexor Hallucis Longus	Posterior ankle → plantar big toe	Push-off power, big toe flexion	Ballet, gymnastics, aggressive push-off sports	Posterior ankle pain, triggering big toe	Silfverskiold + FHL trigger test
Tibialis Anterior	Anterior ankle → 1st metatarsal base	Ankle dorsiflexion	Spontaneous rupture age >50; traction injury	Anterior ankle pain, foot slap gait	Foot drop if complete rupture

Treatment	Phase	Mechanism	Duration	Applies To
Relative Rest (activity modification)	Acute — first 2 weeks	Reduce tensile load to allow healing	2–6 weeks	All tendons
Ice (cryotherapy)	Acute	Reduce blood flow, local analgesia	15–20 min, 3x daily	All — first 48–72 hours especially
NSAIDs (ibuprofen/naproxen)	Acute	COX inhibition — reduce prostaglandin inflammation	7–14 days (avoid long-term for tendinosis)	Acute tendonitis phase
Eccentric Loading Protocol	Subacute → return to sport	Stimulate collagen remodeling, tendon strengthening	12 weeks progressive	Achilles, peroneal, FHL, posterior tibial
Boot Immobilization	Acute-subacute (moderate-severe)	Complete rest to allow inflammatory phase resolution	4–8 weeks	Moderate-severe tendonitis, partial tears
Custom Orthotics	All phases	Correct biomechanical driver (pronation, supination)	Long-term	PT, peroneal, Achilles insertional
PRP Injection	Chronic tendinosis — failed PT >12 weeks	Growth factors stimulate tendon collagen regeneration	1–2 injections	Any tendon with chronic tendinopathy
Surgical Debridement	Chronic — failed all conservative	Remove degenerative tissue, stimulate healing response	3–6 months recovery	Achilles, peroneal, FHL — severe tendinosis

Tendinopathy vs. Tendonitis: Why the Distinction Matters

The term “tendonitis” implies active inflammation — neutrophils, macrophages, the classical signs of redness, heat, and swelling from an acute inflammatory cascade. True acute tendonitis exists, typically in the first 24–72 hours after significant tendon overload. However, the chronic tendon pain that brings most patients to our office is not tendonitis. It is tendinosis — a degenerative, failed-healing response characterized by disorganized collagen fibers, neovascularization, and increased ground substance without meaningful inflammatory cell infiltrate.

This distinction matters because treatment principles differ. Tendinosis requires tendon loading through an appropriate progressive eccentric exercise protocol — loading the tendon to stimulate tenocyte activity and collagen remodeling. Rest alone allows pain to subside temporarily but doesn’t address the degenerative tissue. Prolonged anti-inflammatory medication use in tendinosis is not only ineffective but may be harmful — NSAIDs can impair tendon healing by blocking prostaglandin-mediated repair signaling.

Diagnostic musculoskeletal ultrasound distinguishes acute from chronic changes, measures tendon thickness, identifies partial-thickness tears, and guides injection therapy — all in-office at the initial evaluation.

Achilles Tendinopathy: Mid-Portion vs. Insertional

Mid-Portion Achilles Tendinopathy

Mid-portion Achilles tendinopathy (2–6cm proximal to the calcaneal insertion) is the most common tendon condition in runners, producing a characteristic fusiform palpable nodule within the tendon substance. The Alfredson eccentric heel-drop protocol — 3 sets of 15 repetitions of eccentric calf lowering on the edge of a step, both straight-leg and bent-knee, twice daily — is the most evidence-supported conservative treatment with 70–80% success rates at 12 weeks when properly executed. The protocol is painful initially — the guideline is “train through pain that is no worse than 5/10.” Patients who avoid pain during eccentric loading consistently fail to improve.

For recalcitrant mid-portion Achilles tendinopathy unresponsive to 12 weeks of eccentric training, extracorporeal shockwave therapy (ESWT) has Level I evidence supporting its efficacy. Ultrasound-guided PRP injection targeting the areas of neovascularization and tendinosis on ultrasound imaging represents an additional option for patients who fail ESWT.

Insertional Achilles Tendinopathy

Insertional Achilles tendinopathy at the calcaneal enthesis is a biologically and mechanically distinct entity from mid-portion disease. The compressive component — from the Haglund’s bony prominence and from the dorsal calcaneal surface directly loading the tendon insertion — means that pure eccentric loading (which loads the insertion compressively) may worsen rather than improve symptoms. Modified Alfredson protocol performed on flat ground rather than a step edge reduces compressive load. Retrocalcaneal bursitis is frequently concurrent and responds to ultrasound-guided corticosteroid injection directed into the bursa (not the tendon itself). Surgical calcaneal exostectomy with Achilles debridement and suture anchor reattachment produces excellent outcomes in properly selected patients failing conservative care.

Peroneal Tendinopathy

The peroneal tendons — peroneus brevis and peroneus longus — course posteriorly around the lateral malleolus within the peroneal groove, held in place by the superior peroneal retinaculum (SPR). Peroneus brevis tendinopathy and longitudinal split tears (most commonly at the fibular tip) produce lateral ankle and proximal lateral foot pain — often misdiagnosed as lateral ankle sprain. Peroneus longus tendinopathy produces lateral and plantar foot pain at the cuboid groove, frequently associated with cavovarus foot type that overloads the peroneus longus.

Dynamic ultrasound — imaging the peroneal tendons with active inversion and eversion — identifies subluxation of the tendons over the fibular tip (peroneal subluxation from SPR rupture) that is missed on static MRI. Appropriate conservative management (ASO ankle brace, physical therapy focusing on peroneal strengthening and proprioception) combined with correction of underlying biomechanical drivers (custom orthotics for cavovarus or flexible flatfoot) produces good outcomes in most cases. Operative tubularization of longitudinal split tears or SPR repair for subluxation is reserved for failed conservative care.

Posterior Tibial Tendinopathy

The posterior tibial tendon is the primary dynamic stabilizer of the medial arch — its failure produces the progressive adult acquired flatfoot deformity described in detail on our flatfoot page. Tendinopathy (early Stage I PTTD) presents as medial ankle pain just posterior to the medial malleolus with normal arch height and intact single-limb heel rise. Ultrasound shows tendon thickening, heterogeneous echotexture, and peritendinous fluid. Treatment at Stage I — before functional deficit develops — is immobilization in a CAM boot for 4–6 weeks, followed by Arizona AFO bracing and progressive physical therapy. Failure to diagnose and treat Stage I PTTD before progression to Stage II represents a significant missed opportunity for conservative management.

Flexor Hallucis Longus Tendinopathy

FHL tendinopathy is underdiagnosed and produces pain and crepitus along the medial ankle and plantar first ray — aggravated by push-off activities. It is the primary occupational injury of ballet dancers (“dancer’s tendinopathy”) but also affects recreational runners and athletes who push off forcefully. Hallmark: pain with resisted great toe plantarflexion and passive dorsiflexion. Ultrasound identifies tenosynovitis and tendinosis within the FHL tunnel posterior to the medial malleolus. Conservative treatment with activity modification, FHL eccentric strengthening, and ultrasound-guided corticosteroid injection into the tendon sheath resolves most cases.

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What does treatment cost?

Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Out-of-pocket costs vary by your specific plan.

How quickly can I get an appointment?

Most non-urgent cases see us within 5 business days. Urgent cases (sudden pain, possible fracture) typically same or next business day.

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In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your foot and ankle issues, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.