Achilles Tendinopathy

Overview
Two Distinct Types: Insertional vs. Mid-Portion
Pathophysiology: Tendinopathy, Not Tendinitis
Risk Factors
Diagnosis and the Rupture Distinction
Exercise Rehabilitation: Eccentric and Heavy Slow Resistance
Other Treatments
Prognosis and Return to Activity
Prevention
Recent Research
References & Research
Research Papers
Connections
Featured Videos

1. Overview

If the back of your heel aches when you first get up in the morning, stiffens after you sit for a while, and flares up during or after running, climbing stairs, or pushing off hard during sports — you are probably dealing with Achilles tendinopathy. It is the most common overuse injury of the Achilles tendon, the thick, powerful cord that connects your calf muscles to the back of your heel bone, and it affects everyone from weekend joggers to elite distance runners to people who simply increased their activity level too quickly after a period of rest.

The Achilles tendon is the largest and strongest tendon in the human body, capable of transmitting forces equal to six to eight times your body weight during running. That capacity is remarkable — but it comes with a vulnerability. When the tendon is repeatedly loaded faster than it can repair the microscopic damage that accumulates with each stride, the tissue begins to break down in a way that the body struggles to fully reverse. The result is the chronic aching, stiffness, and swollen nodule that characterize this condition.

The good news is that most people with Achilles tendinopathy recover with exercise-based rehabilitation alone, without injections or surgery. The rehabilitation takes commitment and patience — typically twelve weeks of consistent exercise to see real change — but the approach is well-supported by evidence and can be done at home with minimal equipment. Understanding exactly what is happening in your tendon, and why the exercises work the way they do, makes it far easier to stick with the program even when early progress feels slow.

2. Two Distinct Types: Insertional vs. Mid-Portion

One of the most important things to know about Achilles tendinopathy is that it is not one condition but two, and they behave differently, respond differently to certain treatments, and need to be managed differently. Getting the distinction right before starting rehabilitation matters.

Insertional Achilles Tendinopathy

Insertional tendinopathy affects the point where the Achilles tendon attaches to the back of the heel bone (calcaneus). The pain is right at the bone, at the very back of the heel, often slightly to the side rather than the middle. Several features make it recognizable:

Pain is directly at the heel bone. Pressing on the attachment point — not higher up the tendon — reproduces the pain.
Worse with heel raises. Full-range heel raises, especially off the edge of a step, load the tendon at its most compressed angle and aggravate insertional pain significantly.
Haglund's deformity. Many people with insertional tendinopathy develop a bony prominence on the back upper corner of the heel bone, sometimes called a “pump bump.” The prominence creates mechanical friction against the tendon and surrounding bursa, contributing to pain and sometimes calcification within the tendon at its attachment.
Calcification is common. Calcium deposits form within the tendon at the insertion over time. These appear on X-ray and are a marker of chronic load at that site. The calcification itself is not usually the primary driver of pain but indicates long-standing pathology.
Heel-drop exercises through full range may worsen it. This is the critical practical difference: the eccentric heel-drop program that is cornerstone therapy for mid-portion tendinopathy should not be done through full range for insertional disease, because going below neutral (heel dropping below the step) compresses the tendon against bone and can inflame the bursa.

Mid-Portion Achilles Tendinopathy

Mid-portion tendinopathy affects the tendon body itself, typically 2–6 centimeters above the heel bone insertion. This is the zone with the most tenuous blood supply and the slowest healing. Its features are different:

A palpable nodule or thickening in the tendon body is the classic finding. You can often see and feel a spindle-shaped swelling in the tendon at that 2–6 cm zone. The nodule is disorganized, degenerative tendon tissue that has failed to remodel properly.
Morning stiffness that loosens up. The tendon stiffens overnight. The first few minutes of walking are stiff and achy; then it warms up and eases — only to ache again after prolonged activity.
The tendon moves with the foot, not the skin. When you flex and extend your ankle, the nodule should move up and down with the tendon. This “arc sign” confirms the pain is in the tendon rather than the overlying bursa or skin.
Responds well to eccentric loading through full range. Unlike insertional disease, mid-portion tendinopathy responds well to the full-range Alfredson protocol eccentric heel drops, including lowering the heel below the level of the step. This is the primary rehabilitation approach supported by the strongest evidence for this type.

3. Pathophysiology: Tendinopathy, Not Tendinitis

The older name for this condition was Achilles tendinitis — the “-itis” suffix implying acute inflammation. For most of the twentieth century, treatments followed from that label: rest to calm the inflammation, anti-inflammatory drugs, cortisone injections. The results were often disappointing, and for good reason. The fundamental model was wrong.

Biopsy studies of chronically painful Achilles tendons, most influentially by Maffulli and colleagues, revealed that the hallmark of the condition is not inflammation but failed healing and collagen disorganization. Under the microscope, the tissue shows:

Disorganized collagen fibers. Instead of the tight, parallel, rope-like arrangement of a healthy tendon, the fibers are haphazardly oriented, with gaps, mucoid change, and disrupted cross-linking. The tendon has lost the structural integrity that makes it capable of efficiently transmitting load.
Neovascularization. New, poorly organized blood vessels grow into the tendon from surrounding tissue — a marker of failed chronic repair. These vessels are accompanied by sensory nerve fibers, which is part of why tendinopathic tendons are chronically sensitive even when no acute injury is visible.
Absent inflammatory cells. Classical inflammatory cells (neutrophils, macrophages in acute-phase numbers) are largely absent in chronic disease. This is the key finding: what looks like “inflammation” clinically (swelling, sensitivity, warmth) is actually a failed healing response, not an acute inflammatory cascade.

The term tendinopathy (“-pathy” meaning disease or pathology of the tissue) replaced tendinitis in the research literature to capture this reality. The change is not just semantic. If the tissue is degenerating rather than inflamed, then anti-inflammatory drugs are at best symptomatic and at worst counterproductive — NSAIDs can interfere with the collagen remodeling and prostaglandin signaling the tendon needs to repair. The tissue needs to be mechanically loaded in a graded, progressive way to stimulate the tenocytes (the cells that make collagen) to reorganize the matrix. This is exactly why exercise is the treatment, not rest.

The same paradigm shift happened in plantar fascia disease, now often called plantar fasciosis rather than plantar fasciitis. The two conditions are mechanistic cousins, and the rehabilitation logic is nearly identical: graded mechanical loading to drive tissue remodeling.

4. Risk Factors

Achilles tendinopathy is an overuse injury, but not everyone who overtrains develops it. A combination of intrinsic (body-based) and extrinsic (load and environment) factors determines risk.

Intrinsic risk factors

Age and male sex. Tendon metabolism slows with age; the ability to remodel collagen after loading decreases. Men are affected roughly twice as often as women, partly because of higher training volumes and partly because of differences in tendon collagen composition and estrogen effects on tendon stiffness.
Tight or weak calf muscles. Just as with plantar fasciitis, restricted ankle dorsiflexion (limited upward bending of the foot) overloads the Achilles with every step. Weak calf muscles that fatigue quickly transfer load to the tendon structure itself rather than absorbing it through the muscle belly.
Overpronation or biomechanical asymmetries. Excessive inward rolling of the foot places oblique strain on the Achilles tendon, which is designed to transmit force in a straight vertical line.
Previous tendon injury. A tendon that has undergone one episode of tendinopathy remains structurally altered and is more susceptible to re-injury, particularly if rehabilitation was incomplete.

Extrinsic risk factors

Sudden increase in training load. The most common trigger. This includes returning to running after a winter break, rapidly increasing weekly mileage, adding hill work or speed intervals, or switching to minimalist footwear that shifts load to the calf and Achilles.
Fluoroquinolone antibiotics. This is an under-recognized and important risk. Fluoroquinolone antibiotics — ciprofloxacin, levofloxacin, moxifloxacin — carry an FDA black box warning for tendon rupture and tendinopathy. They directly impair collagen synthesis and tenocyte function. The Achilles tendon is the most commonly affected. Risk is amplified in people over 60 and those taking corticosteroids. Any Achilles pain that develops during or shortly after a fluoroquinolone course should be taken seriously.
Corticosteroid injections into or near the tendon. While cortisone can temporarily relieve pain, injecting it into tendinopathic tissue weakens collagen structure and significantly raises the risk of tendon rupture. Most guidelines now recommend against intratendinous corticosteroid injection for Achilles tendinopathy specifically because of this risk.
Footwear changes. Switching to lower-heeled or minimalist shoes increases the effective range of motion through which the Achilles must stretch, loading sections of the tendon that were previously protected. The transition needs to be very gradual.
Hard training surfaces. Running consistently on concrete or asphalt, especially compared to grass or track, increases the ground reaction forces transmitted through the calf and tendon.

5. Diagnosis and the Rupture Distinction

Like plantar fasciitis, Achilles tendinopathy is primarily a clinical diagnosis based on history and physical examination. Imaging is reserved for atypical presentations or when a more serious injury needs to be ruled out.

Clinical examination

Locating the pain precisely. The examiner palpates the tendon from its insertion on the calcaneus upward through the tendon body into the musculotendinous junction. Pain exactly at the insertion suggests insertional disease; pain in the 2–6 cm zone above it confirms mid-portion. This distinction guides the rehabilitation protocol.
The arc sign. With the patient prone and the examiner moving the ankle through flexion and extension, a mid-portion nodule moves with the tendon; pain from the retrocalcaneal bursa or skin does not move.
The Royal London Hospital Test. The examiner squeezes the tendon at the point of maximum tenderness while the ankle is in plantarflexion (pointed down). The pain diminishes or disappears compared to squeezing in the neutral position. This test distinguishes tendon pathology from bursal pathology at the insertion.

Imaging

Ultrasound is the first-line imaging choice when needed. It can identify tendon thickening, hypoechoic degenerated areas, neovascularization on Doppler, and insertional calcification. It is inexpensive, dynamic (can be done while moving the ankle), and guides injection procedures when needed.
X-ray is used when Haglund's deformity or calcification is suspected at the insertion, and to rule out calcaneal stress fracture when heel pain is atypical.
MRI provides the most detailed view of tendon structure and is reserved for pre-surgical planning or when the diagnosis is genuinely uncertain.

Distinguishing Achilles Tendon Rupture — a critical distinction

Achilles tendon rupture is a completely different injury from tendinopathy and requires urgent recognition. It does not announce itself as a gradual ache that gets worse — it presents dramatically:

A sudden “pop” or crack felt and often heard during activity — commonly during a sprint, jump, or aggressive push-off.
Immediate pain and inability to push off the foot against resistance. Walking may still be possible because other ankle flexors are intact, which can misleadingly reassure the patient.
A palpable gap in the tendon, usually 2–6 cm above the insertion, where the torn ends have retracted.
The Thompson test (calf-squeeze test): With the patient prone and the knee bent to 90 degrees, the examiner squeezes the calf muscle belly. In a normal tendon this plantarflexes the foot. If the tendon is completely ruptured, the foot does not move — a positive Thompson test, indicating rupture. This is one of the most reliable bedside tests in orthopedics.

A positive Thompson test is a reason to seek emergency or urgent orthopedic evaluation the same day. Both surgical and non-surgical (cast immobilization) management are viable options depending on patient age, activity level, and surgical risk; this decision is made with a specialist. Injecting a ruptured tendon with corticosteroid is dangerous and further weakens the already-compromised tissue.

6. Exercise Rehabilitation: Eccentric and Heavy Slow Resistance

Exercise is not merely one treatment option for Achilles tendinopathy — it is the primary, most evidence-based treatment for both insertional and mid-portion types. The rationale is mechanobiological: loading the tendon in a specific, progressive way stimulates tenocytes to produce organized collagen, gradually replacing the disorganized degenerated tissue with something closer to normal tendon structure.

The Alfredson Eccentric Protocol

The landmark paper in Achilles tendinopathy rehabilitation was published in 1998 by Håkan Alfredson and colleagues at Umeå University in Sweden (PMID: 9572460). Alfredson, himself a runner with Achilles tendinopathy who had been told he needed surgery, devised and tested an eccentric loading protocol on a group of 15 patients:

The exercise: Stand on a step with just the forefoot on the edge. Using the non-affected leg to rise up on the toes, then lower using only the affected leg — slowly, under control, through the full range of motion so the heel drops below the level of the step. This is the eccentric phase (the muscle-tendon unit lengthening under load), which appears to be the most potent stimulus for tendon remodeling.
Dose: 3 sets of 15 repetitions, twice daily, 7 days a week, for 12 weeks. Both a straight-knee version (targeting the gastrocnemius) and a bent-knee version (targeting the soleus, which has a larger contribution to the Achilles) are performed.
The controversial rule for mid-portion: Alfredson instructed patients to continue through pain — not through sharp or escalating pain, but through the dull aching that characterizes tendinopathy. This counterintuitive instruction is important: patients who avoid any discomfort during the exercise tend to under-load the tendon and see less benefit.
Result: 15 of 15 patients in the original study were able to return to running at the 12-week mark. Subsequent larger trials have confirmed benefit rates of roughly 70–90% for mid-portion tendinopathy.

Important modification for insertional tendinopathy: Do not drop the heel below neutral (below the step level) in insertional disease. The full range-of-motion eccentric compresses the tendon against the calcaneus at the insertion, aggravating both the tendon and the retrocalcaneal bursa. Insertional protocol: perform the eccentric drop only to the neutral position (flat foot level), not below.

Heavy Slow Resistance (HSR) — An Equally Valid Alternative

A significant body of evidence, led by a Danish research group including Beyer and colleagues, has established that heavy slow resistance (HSR) training produces outcomes equivalent to the Alfredson eccentric protocol for mid-portion tendinopathy, with better patient satisfaction and adherence in some trials.

HSR involves both the concentric (raising) and eccentric (lowering) phases of the movement, performed slowly and with progressively increasing load (using a weighted backpack, machine, or leg press). The 2015 trial by Beyer et al. (PMID: 25766195) randomized patients to either eccentric-only or HSR and found comparable clinical outcomes at 12 weeks. Their 2-year follow-up (PMID: 28290185) showed similar long-term results with HSR patients reporting higher satisfaction.

Practical advantages of HSR for many patients:

The full concentric phase can feel more natural and less intimidating than pure eccentric-only work.
Progressive load increases are easy to implement with a weighted backpack or gym equipment.
It can be easier to perform without a step, making it more accessible at home.
The slower tempo (3 seconds up, 3 seconds down) with deliberate progression may produce better tendon structural changes over time.

For patients who find the Alfredson protocol difficult to tolerate or who have access to a gym, HSR is a fully evidence-based alternative, not a second-best option.

7. Other Treatments

Exercise rehabilitation is the foundation; other interventions are adjuncts for patients who are not responding adequately or who have specific indications.

Footwear and load management

In the short term, a small heel lift (10–15 mm) inside the shoe reduces the range of motion through which the Achilles must stretch, off-loading the tendon enough to allow exercise rehabilitation to begin. This is not a cure — the tendon still needs to adapt to full range over time — but it reduces pain during the early weeks. For insertional disease, a firm heel cup or modified shoe counter that avoids direct pressure on the Haglund's deformity reduces mechanical friction. Avoid flat shoes and barefoot walking on hard floors during the acute phase of symptoms.

Extracorporeal shockwave therapy (ESWT)

Shockwave therapy delivers acoustic pulses to the tendon, stimulating a healing response in degenerative tissue and possibly disrupting calcification at the insertion. Evidence for ESWT in Achilles tendinopathy is reasonably favorable, particularly for insertional disease where the combination of bony pathology and calcification may not fully resolve with exercise alone. Multiple randomized trials and systematic reviews support ESWT as a reasonable option when exercise rehabilitation alone is insufficient after 3–6 months. It is non-invasive, carries low risk, and is generally considered before any surgical option.

Platelet-rich plasma (PRP)

PRP involves injecting a concentrate of the patient’s own blood platelets, with their growth factors, into the tendinopathic tissue to stimulate healing. For mid-portion tendinopathy, early trials suggested promise, but larger, better-controlled trials have not consistently confirmed meaningful benefit over saline or exercise alone. For insertional tendinopathy, a notable negative result came from the TOPAZ trial (van der Plas et al., PMID: 26084308), which found no significant advantage for PRP over dry needling in insertional disease. The honest current assessment is that PRP for Achilles tendinopathy has not definitively proven its value over well-executed rehabilitation, and it is expensive and not routinely covered by insurance. It remains a reasonable consideration for patients with persistent symptoms after conservative measures have been genuinely exhausted.

Corticosteroid injections — use with caution

Unlike plantar fasciitis, where a carefully placed cortisone injection carries a manageable risk profile, corticosteroid injection is considerably more hazardous for Achilles tendinopathy. The tendon has already compromised structural integrity; cortisone further weakens collagen and significantly raises the risk of complete rupture. Current evidence and clinical guidelines generally advise against intratendinous injection. Peritendinous injection (around rather than into the tendon) or injection targeting a coexisting retrocalcaneal bursitis carries somewhat lower risk but should still be used cautiously and sparingly, with a clear understanding that the short-term pain relief does not address the underlying tendon pathology.

Surgery

Surgery is the last resort, reserved for the minority of patients with severe, persistent symptoms after 6–12 months of thorough evidence-based rehabilitation. Procedures vary by type: for mid-portion disease, options include stripping of the peritenon, tenotomy (longitudinal incisions through the tendon to stimulate healing), or debridement of degenerated tissue. For insertional disease, surgery may involve removal of the Haglund's deformity, debridement of calcification, and reattachment of the tendon if it is partially detached during the process. Recovery from Achilles surgery is measured in months. Most specialists recommend exhausting all conservative options before proceeding.

8. Prognosis and Return to Activity

The prognosis for Achilles tendinopathy is generally favorable, but it requires realistic expectations about the timeline. This is not a two-week injury. For most patients, meaningful improvement from a properly executed rehabilitation program takes 8–12 weeks before they feel substantially better, and full return to unrestricted athletic activity may take 4–6 months.

Several factors predict a better outcome:

Early recognition and consistent rehabilitation. Patients who start structured loading exercises soon after symptoms appear and stick with the program see the best results. Long-delayed treatment, or treatment consisting mainly of passive modalities (rest, ice, NSAIDs) without progressive loading, prolongs recovery.
Younger age and lower baseline tendon degeneration. Tendons with less structural change at baseline respond more readily to remodeling signals. This is partly why it is worth treating tendinopathy early rather than managing it as a minor nuisance until it becomes severely degenerated.
Addressing underlying biomechanical factors. Patients who also work on calf flexibility, correct overpronation, and gradually return to activity with sensible load management recur less than those who treat the tendon in isolation and return to the same training habits that caused the problem.

A realistic caution: the underlying structural changes in a tendinopathic tendon do not fully normalize even after clinical recovery. Imaging studies show that ultrasound abnormalities often persist even after patients are pain-free and have returned to full activity. A symptom-free tendon is not necessarily a fully healed tendon. This means that abrupt return to high-load training after a symptom-free period can trigger recurrence, and maintaining a baseline of calf strength and tendon loading is wise for the long term.

9. Prevention

Achilles tendinopathy is largely preventable, or at least its recurrence is preventable, with a few consistent habits:

Increase training load gradually. The tendon adapts to load, but it adapts slowly compared to muscle. The standard guidance is not to increase weekly running volume by more than 10% per week. After any break from activity lasting more than two to three weeks, restart at a much reduced load and rebuild.
Maintain calf strength and flexibility year-round. Regular calf raises, calf stretching, and progressive loading of the tendon through its full range keep the tendon healthy and responsive. Waiting until symptoms appear to start loading the tendon means you are always playing catch-up.
Transition footwear changes slowly. Moving to lower-heeled, more minimal, or different-category footwear is fine, but it needs to happen over weeks to months, not days. The Achilles lengthens under more demand in lower-heeled shoes and needs time to adapt.
Be alert to fluoroquinolone antibiotics. If you are prescribed ciprofloxacin, levofloxacin, or a related antibiotic, ask your prescriber whether a non-fluoroquinolone alternative is appropriate, especially if you have a history of Achilles tendinopathy or are over 60. If the fluoroquinolone is necessary, reduce tendon load during the course and for 4–6 weeks afterward.
Avoid corticosteroid injections near the Achilles for non-tendon conditions. Systemic corticosteroid use and local injections near the Achilles both weaken tendon tissue. This is especially important for people who are already active and loading their tendons significantly.
Listen to early warning signals. Stiffness after activity, mild morning aching in the tendon, or a small nodule appearing in the tendon body are early signs. Addressing them with a structured loading program at that stage is far more straightforward than treating an established, long-standing tendinopathy.

10. Recent Research

Research into Achilles tendinopathy has accelerated considerably over the past two decades, driven by its enormous prevalence in recreational and elite sport. Several themes from the current literature are worth knowing:

The HSR versus eccentric debate. The 2-year data from Beyer et al. have helped establish HSR as a genuinely equivalent alternative to eccentric-only protocols, and more recent work is exploring optimal load parameters, frequency, and progression rates. The field is moving toward “individualized loading” frameworks that titrate load based on the tendon’s symptomatic response rather than applying a single fixed protocol.
Tendon neuroplasticity and pain sensitization. There is growing recognition that in long-standing tendinopathy, central sensitization — heightened pain processing at the level of the spinal cord and brain — plays a role alongside the local tissue pathology. This may partly explain why some patients have pain out of proportion to their structural changes on imaging, and it supports the inclusion of patient education and activity normalization as part of rehabilitation.
Biological therapies under scrutiny. Beyond PRP, researchers are investigating injectable collagen, autologous tenocyte implantation, and various growth factor preparations. None has reached the threshold of evidence needed for routine recommendation. The honest summary is that no injectable therapy has yet outperformed well-executed progressive loading in high-quality trials.
Insertional tendinopathy receives more focused attention. Historically underrepresented in research compared to mid-portion disease, insertional tendinopathy is now the subject of dedicated trials. The TOPAZ trial’s negative PRP result was specifically in insertional disease and has sharpened the field’s understanding of how these two subtypes differ not just clinically but in their response to treatment.
Imaging-guided management. Ultrasound-guided dry needling (without injected drug), aimed at stimulating the intrinsic healing response in the tendon, is under investigation as a low-risk, low-cost adjunct to exercise therapy. Early results are modestly positive but larger trials are needed.

11. References & Research

Historical Background

The Achilles tendon takes its name from the hero of Homer’s Iliad, whose only vulnerability was the tendon at the back of his heel — an enduring metaphor for a structure that, for all its power, carries a specific and serious weakness. Clinical descriptions of Achilles pain in athletes appeared in medical literature through the twentieth century, initially interpreted as inflammatory in nature. The pivotal conceptual shift toward “tendinopathy” rather than “tendinitis” was driven by biopsy studies in the 1990s and early 2000s, particularly the work of Maffulli and colleagues, who found chronic degenerative change without inflammatory infiltrate in symptomatic tendons (PMID: 20823132). Alfredson’s 1998 eccentric loading trial (PMID: 9572460) was the watershed moment for rehabilitation, establishing that loading — not rest — was the primary treatment. Subsequent decades have refined the exercise approach, explored biological adjuncts, and increasingly distinguished insertional from mid-portion disease as separate clinical entities with different natural histories.

Key Research Papers

Alfredson H et al., 1998 — PMID: 9572460 — Original eccentric loading trial; 15/15 patients returned to running.
Beyer R et al., 2015 — PMID: 25766195 — RCT comparing HSR vs. eccentric-only; equivalent outcomes at 12 weeks.
Beyer R et al., 2017 — PMID: 28290185 — 2-year follow-up of HSR vs. eccentric; higher satisfaction with HSR.
van der Plas A et al., 2012 — PMID: 26084308 — TOPAZ trial; PRP not superior to dry needling for insertional Achilles tendinopathy.
Maffulli N et al., 2010 — PMID: 20823132 — Defining tendinopathy; histopathological basis for the paradigm shift away from “tendinitis.”
Scott A et al., 2013 — PMID: 24435024 — Review of insertional Achilles tendinopathy; management and outcomes.
Corticosteroid injection and Achilles rupture risk — PubMed search
Fluoroquinolone antibiotics and Achilles tendinopathy — PubMed search
Haglund’s deformity and insertional Achilles tendinopathy — PubMed search
Extracorporeal shockwave therapy for Achilles tendinopathy — PubMed search
Thompson test for Achilles tendon rupture diagnosis — PubMed search
Achilles tendinopathy prognosis and return to sport — PubMed search

Research Papers

The links below open live searches on PubMed, the U.S. National Library of Medicine’s database of peer-reviewed biomedical literature. Use them to explore the current evidence on Achilles tendinopathy — its causes, rehabilitation, imaging, and surgical options — and to find newly published studies.

Connections

Plantar Fasciitis — shares the same tendinopathy/fasciosis degenerative model; eccentric loading principles apply to both.
Stress Fracture — calcaneal stress fracture can mimic Achilles pain and must be excluded with imaging.
ACL Tear — another sport-related lower-limb injury involving abrupt force through connective tissue.
Meniscus Tear — a related overuse and acute injury in the lower limb requiring graded rehabilitation.
Tendinitis — the broader category of tendon overuse injury; Achilles tendinopathy is the paradigm case for the shift to “tendinopathy.”
Sciatica — nerve root compression can refer pain to the posterior leg and heel, a differential to consider.
Osteoarthritis — degenerative joint disease that co-occurs with degenerative tendon disease in older and higher-load patients.
Orthopedics — all musculoskeletal conditions covered on this site.

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