Lateral Epicondylitis (Tennis Elbow)

Overview
Epidemiology
Anatomy and Pathology
Clinical Presentation
Diagnosis
Conservative Treatment
Injections and Procedures
Surgery and Prognosis
Key Research Papers
Connections
Featured Videos

1. Overview

Lateral epicondylitis — better known as tennis elbow, and also called lateral elbow tendinopathy or lateral epicondylalgia — is pain at the outer elbow arising from the tendon origin of the forearm extensor muscles, chiefly the extensor carpi radialis brevis (Nirschl 1979; Zeisig 2006). Elbow tenderness and pain when the wrist is extended against resistance are its common features (Mishra 2014). Despite the sporting nickname, a Finnish population study tied the condition mainly to repetitive and forceful arm work, and to smoking (Shiri 2006).

The “-itis” in the name implies inflammation, and the nature of the tissue change has been debated for decades. A 1992 study of tissue removed at surgery found vascular proliferation and degeneration rather than an inflammatory picture (Regan 1992), and the condition is also described as ECRB tendinosis (Zeisig 2006). A 2021 study, however, found more macrophages and inflammatory signalling molecules in affected tendon than in control tendon and concluded that inflammation is involved (Al-Dhafer 2021).

The course is usually favourable. Researchers who followed 349 primary-care patients described lateral epicondylitis as “a self-limiting condition in most patients” (Smidt 2006), and in several randomized trials most people in the wait-and-see or placebo arms had recovered or much improved by one year (Smidt 2002; Bisset 2006; Coombes 2013). Recovery can take many months, and treatments that help most in the first weeks are not always the ones that do best at a year — the clearest example being corticosteroid injection (section 7).

2. Epidemiology

In a representative Finnish sample of 4,783 people aged 30–64, the prevalence of definite lateral epicondylitis was 1.3%. Prevalence did not differ between men and women and was highest at ages 45–54 (Shiri 2006). In a United States population-based study, the yearly incidence of new cases fell from 4.5 per 1,000 people in 2000 to 2.4 per 1,000 in 2012; the authors noted this could reflect changes in diagnosis patterns or a true decrease (Sanders 2015).

Factors the research links to the condition:

Repetitive and forceful arm work. In the Finnish study, people whose work combined repetitive arm movements with forceful activities had an odds ratio of 5.6 for possible or definite lateral epicondylitis compared with people doing neither (Shiri 2006). Among 290 male gas- and waterworks employees in Hamburg, ten years of high exposure to elbow-straining work carried an odds ratio of 1.7 in current jobs, suggesting a cumulative effect with length of employment (Ritz 1995).
Smoking. Current smoking (odds ratio 3.4) and former smoking (odds ratio 3.0) were associated with definite lateral epicondylitis (Shiri 2006).
Obesity. In the same study, obesity was significantly associated with medial epicondylitis (the inner-elbow counterpart); the abstract names physical load, smoking and obesity as strong determinants of epicondylitis overall (Shiri 2006).

In the United States cohort, recurrence within two years was 8.5% (Sanders 2015).

3. Anatomy and Pathology

The defining lesion sits at the origin of the extensor carpi radialis brevis (ECRB), one of the forearm extensor muscles whose tendons arise from the common extensor origin at the outer elbow (Zeisig 2006). In the 1979 surgical series by Nirschl and Pettrone, the lesion consistently found at operation was “immature fibroblastic and vascular infiltration of the origin of the extensor carpi radialis brevis” (Nirschl 1979).

Degeneration, inflammation, or both

Regan and colleagues compared tissue from 11 people operated on for chronic lateral epicondylitis with tissue from 12 cadavers. Every surgical specimen was abnormal: vascular proliferation was present in 10 of 11 and focal hyaline degeneration in all 11, while no control specimen showed either. The authors concluded that chronic refractory lateral epicondylitis requiring surgery is “a degenerative rather than inflammatory process” (Regan 1992).

That view has been qualified. A 2021 case-control study of 10 patients and 14 controls found significantly higher levels of neuropeptides (substance P and CGRP), glutamate receptors, inflammatory cytokines (interleukin 1α and TNF-α) and macrophages in affected ECRB tendon, with no difference in T- or B-lymphocytes (Al-Dhafer 2021).

New blood vessels and pain

Using ultrasound with colour Doppler, a Swedish group found blood-vessel signal in the extensor origin of 21 of 22 painful elbows but only 2 of 22 pain-free elbows. After a local anaesthetic was injected into the area with vessels, the patients were pain-free during extensor-loading activity, suggesting the vascular area is related to the pain (Zeisig 2006).

4. Clinical Presentation

Tenderness at the outer elbow and pain with resisted wrist extension are the common manifestations (Mishra 2014). Severity varies widely: a review by Coombes, Bisset and Vicenzino describes a prognosis that ranges “from immediate resolution of symptoms following simple advice in some patients to long-lasting problems, regardless of treatment, in others” (Coombes 2015).

Features measured at presentation that predicted more pain at 12 months in primary-care patients were a long duration of elbow complaints, concomitant neck pain and severe pain at the first visit; at one month, concomitant shoulder pain also predicted more pain (Smidt 2006). The Coombes review also names neck pain, tendon tears and central sensitization as factors with possible prognostic value (Coombes 2015).

Outer-elbow pain is not always tennis elbow. In a 2026 Dutch cohort of 170 consecutive patients with lateral elbow pain seen in orthopaedic clinics, 46.5% received a different diagnosis. Independent predictors of another diagnosis were age 30 or younger, sudden onset, locking of the joint, joint effusion, a positive instability test and a negative Maudsley test (resisted middle-finger extension) (Zwerus 2026).

5. Diagnosis

Lateral elbow tendinopathy is typically diagnosed from the symptoms and physical examination, without imaging in the initial workup (Zwerus 2026).

Physical examination tests

Many provocation tests are described for the elbow, but few have been studied for accuracy. A 2018 systematic review found 24 described elbow test procedures, only one included article for lateral epicondylitis, and concluded that none of the described tests “can provide adequate certainty to rule in or rule out a disease” (Zwerus 2018). In a Brazilian study of 102 adults with lateral epicondylitis, Mill’s test was reliable and accurate against ultrasound, while Cozen’s test showed good reliability, with significant differences reported against the ultrasound exams (Soares 2023). In the Dutch cohort above, a negative Maudsley test pointed toward a diagnosis other than tennis elbow (Zwerus 2026).

Imaging

A systematic review of 10 studies (711 participants, 1,077 elbows) found that ultrasound had variable sensitivity (64–100%) and specificity (36–100%) for lateral epicondylitis, with accuracy dependent on operator experience, equipment and stage of disease (Latham 2014). Colour Doppler can show the blood-vessel signal described in section 3 (Zeisig 2006).

6. Conservative Treatment

A 2022 clinical practice guideline from the Japanese Orthopaedic Association and Japan Elbow Society reports that physical therapy was “the best recommendation with the best evidence” among the options it reviewed (Amako 2022). The size of the benefit in trials depends on when it is measured.

Physiotherapy compared with wait-and-see

In a Dutch trial of 185 patients, success rates at 52 weeks were 91% with physiotherapy and 83% with a wait-and-see policy; physiotherapy did better, but the difference was not statistically significant (Smidt 2002).
In an Australian trial of 198 participants, eight sessions of physiotherapy combining elbow manipulation and exercise beat wait-and-see in the first six weeks; at 52 weeks there was no difference, and most participants in both groups reported a successful outcome. The physiotherapy group sought less additional treatment, such as NSAIDs (Bisset 2006).
In a 165-patient factorial trial, physiotherapy made no significant difference at one year (91% vs 88% completely recovered or much improved). At four weeks, placebo injection plus physiotherapy produced more recovery than placebo injection alone (39% vs 10%) (Coombes 2013).

Eccentric exercise

A 2014 systematic review of 12 studies found that programmes including eccentric exercise improved pain, function and grip strength, and that most consistent findings support including it within a multimodal therapy programme; the only study of eccentric exercise on its own was of low quality and found no significant pain improvement compared with other treatments (Cullinane 2014). A 2021 meta-analysis of eight studies found large short-term effects of eccentric strengthening on pain and function compared with other strengthening and pain-relieving methods, while long-term results were inconclusive (Chen 2021).

Counterforce brace

In a double-blinded trial of 31 people with acute tennis elbow, a counterforce brace (17 people) was compared with a placebo brace (14). Both groups improved; the counterforce brace reduced the frequency and severity of pain more in the short term (2–12 weeks) and gave better patient-rated overall elbow function at 26 weeks (Kroslak 2019).

NSAIDs

A 2013 Cochrane review (15 trials, 759 participants) found low-quality evidence that topical NSAIDs relieved pain better than placebo in the short term (up to about four weeks), with a mild skin rash in 2.5% of users versus 1.3% on placebo. Evidence on oral NSAIDs was conflicting, and oral use was associated with gastrointestinal side effects in some trials. The authors concluded that the evidence is too limited for firm conclusions about benefits or harms (Pattanittum 2013).

7. Injections and Procedures

Several injection and procedural treatments have been tested in randomized trials. A recurring finding is that short-term and long-term results can point in opposite directions.

Corticosteroid injection

Corticosteroid injection has the most consistent trial evidence of short-term benefit followed by poorer long-term results:

Smidt 2002 (Lancet, 185 patients): at 6 weeks, injections were significantly better than physiotherapy or wait-and-see on every outcome (success 92% vs 47% vs 32%), but the recurrence rate after injection was high. At 52 weeks, success rates were 69% with injections, 91% with physiotherapy and 83% with wait-and-see; the long-term difference between injection and physiotherapy significantly favoured physiotherapy.
Bisset 2006 (BMJ, 198 participants): injection was better at six weeks, but 47 of its 65 early successes later regressed, and long-term outcomes were significantly poorer than with physiotherapy. The authors described the short-term benefit as “paradoxically reversed after six weeks.”
Coombes 2013 (JAMA, 165 patients): compared with a placebo injection, corticosteroid injection led to less complete recovery or much improvement at one year (83% vs 96%) and more recurrence (54% vs 12%); at 26 weeks the figures were 55% vs 85%. Adding physiotherapy to the corticosteroid injection made no difference at four weeks (68% vs 71%).

A 2002 systematic review of 13 studies found short-term (up to 6 weeks) benefits on pain, global improvement and grip strength, no benefit at intermediate or long-term follow-up, and poor internal validity in almost all studies (Smidt 2002, Pain). A 2013 network meta-analysis found that beyond 8 weeks, glucocorticoid injection was no more effective than placebo (Krogh 2013, meta-analysis). In a three-arm trial, glucocorticoid also reduced tendon thickness and Doppler activity on ultrasound compared with platelet-rich plasma or saline (Krogh 2013, trial). The Cochrane NSAID review notes that transient pain may occur following injection (Pattanittum 2013).

Platelet-rich plasma (PRP) and autologous blood

PRP is a concentrate of platelets prepared from the patient’s own blood; autologous blood injection uses the patient’s whole blood. Animal models and observational studies suggested these injections may modulate tendon healing, but randomized trials have reported inconsistent results (Karjalainen 2021). The trial findings:

Mishra 2014 (230 patients, 12 centres): all patients had their extensor tendons needled under local anaesthetic, with or without leukocyte-enriched PRP — the comparison was an active needling control, not corticosteroid. There was no significant difference at 12 weeks (pain improvement 55.1% vs 47.4%). At 24 weeks, reached by 119 patients, pain improved 71.5% vs 56.1% and success rates were 83.9% vs 68.3%, both significant.
Krogh 2013 trial (60 patients): a single injection of PRP, glucocorticoid or saline; pain fell in all three groups with no significant difference at 3 months, while glucocorticoid reduced pain more than either at 1 month.
Karjalainen 2021 Cochrane review (32 studies, 2,337 participants): moderate-certainty evidence that autologous blood or PRP injection probably does not provide clinically significant improvement in pain or function compared with placebo injection at three months (pain 0.16 points better on a 0–10 scale), and no clinically important benefit at six or twelve months. Low-certainty evidence suggested PRP may not increase adverse events.

The 2013 network meta-analysis had found autologous blood and PRP statistically superior to placebo, but only one of those trials was at low risk of bias, and the authors concluded there was a paucity of unbiased evidence for any injection therapy (Krogh 2013, meta-analysis).

Other injections

In the same network meta-analysis, botulinum toxin showed a marginal benefit but caused temporary weakness of finger extension, with all its trials at high risk of bias; prolotherapy and hyaluronic acid outperformed placebo in single trials; polidocanol and glycosaminoglycan showed no effect (Krogh 2013, meta-analysis).

Extracorporeal shockwave therapy (ESWT)

The 2005 Cochrane review of nine placebo-controlled trials (1,006 participants) found no significant benefit of ESWT over placebo in 11 of 13 pooled analyses and concluded that there is “Platinum” level evidence that shock wave therapy “provides little or no benefit in terms of pain and function in lateral elbow pain.” In one trial of 93 participants, steroid injection was more effective than ESWT at three months. Reported side effects were minimal — mostly transient pain, skin reddening and nausea (Buchbinder 2005).

8. Surgery and Prognosis

Surgical options

Surgery is used for a small share of cases. In the United States cohort, the proportion treated surgically within two years of diagnosis rose from 1.1% (2000–2002) to 3.2% (after 2009), and about 1 in 10 patients still symptomatic at six months had surgery (Sanders 2015). Techniques studied include excision of the affected portion of the ECRB — described as one of the most frequently performed operations (Kroslak 2018) — arthroscopic debridement, percutaneous release and radiofrequency microtenotomy (Buchbinder 2011; Tang 2025).

Open excision (Nirschl and Pettrone): of 1,213 cases seen from 1971 to 1977, 88 elbows in 82 patients were operated on: the ECRB was exposed, the lesion excised and the tendon repaired. Results were rated excellent in 66 elbows, good in 9, fair in 11 and failed in 2 — an overall improvement rate of 97.7%, with 85.2% returning to full activity including rigorous sports. This was an uncontrolled case series (Nirschl 1979).
Surgery versus placebo surgery: in a double-blinded trial, 13 patients with tennis elbow for more than 6 months who had failed at least two nonsurgical treatments had the degenerated ECRB excised, and 13 had a sham procedure (skin incision and exposure of the ECRB only). Both groups improved at 6 months and 2.5 years, with no significant difference in any measure at any stage. The trial stopped before its planned 40 patients per group; a futility analysis estimated that more than 6,500 patients per group would be needed to show a difference in the primary outcome (Kroslak 2018).
Comparisons between techniques: a 2011 Cochrane review of five trials (191 participants), all highly susceptible to bias, found insufficient evidence to support or refute surgery for lateral elbow pain; one trial found slightly better function after percutaneous than after open release (Buchbinder 2011). A 2025 meta-analysis of 10 comparative studies found no significant advantage of arthroscopic over open debridement, a longer operating time for arthroscopy, and radial nerve injury as the most common arthroscopic complication (0.46% vs 0.33% after open surgery, not significantly different) (Tang 2025).

Prognosis and natural history

Smidt and colleagues followed 349 patients from two primary-care trials, adjusting for the trial and treatment received. At 12 months, a long duration of elbow complaints, concomitant neck pain and severe pain at presentation were associated with a poor outcome, and patients from higher social classes reported lower pain scores (Smidt 2006). In the comparison arms of randomized trials, 83% of the wait-and-see group in one trial counted as a success at 52 weeks (Smidt 2002), most wait-and-see participants in another reported success at 52 weeks (Bisset 2006), and 96% of those given a placebo injection in a third were completely recovered or much improved at one year (Coombes 2013).

The United States population study recorded a two-year recurrence rate of 8.5%, and its authors suggested that patients without resolution six months after onset may have a prolonged course (Sanders 2015).

Decisions about injections, procedures and surgery belong with a clinician.

Key Research Papers

Smidt N, van der Windt DA, Assendelft WJ, et al. (2002). Corticosteroid injections, physiotherapy, or a wait-and-see policy for lateral epicondylitis: a randomised controlled trial. The Lancet — PubMed PMID: 11879861
Smidt N, Lewis M, van der Windt DA, et al. (2006). Lateral epicondylitis in general practice: course and prognostic indicators of outcome. Journal of Rheumatology — PubMed PMID: 16881095
Mishra AK, Skrepnik NV, Edwards SG, et al. (2014). Efficacy of platelet-rich plasma for chronic tennis elbow: a double-blind, prospective, multicenter, randomized controlled trial of 230 patients. American Journal of Sports Medicine — PubMed PMID: 23825183
Buchbinder R, Green SE, Youd JM, et al. (2005). Shock wave therapy for lateral elbow pain. Cochrane Database of Systematic Reviews — PubMed PMID: 16235324
Nirschl RP, Pettrone FA. (1979). Tennis elbow. The surgical treatment of lateral epicondylitis. Journal of Bone and Joint Surgery (American Volume) — PubMed PMID: 479229
Smidt N, Assendelft WJ, van der Windt DA, et al. (2002). Corticosteroid injections for lateral epicondylitis: a systematic review. Pain — PubMed PMID: 11932058
Bisset L, Beller E, Jull G, et al. (2006). Mobilisation with movement and exercise, corticosteroid injection, or wait and see for tennis elbow: randomised trial. BMJ — PubMed PMID: 17012266
Coombes BK, Bisset L, Brooks P, et al. (2013). Effect of corticosteroid injection, physiotherapy, or both on clinical outcomes in patients with unilateral lateral epicondylalgia: a randomized controlled trial. JAMA — PubMed PMID: 23385272
Krogh TP, Fredberg U, Stengaard-Pedersen K, et al. (2013). Treatment of lateral epicondylitis with platelet-rich plasma, glucocorticoid, or saline: a randomized, double-blind, placebo-controlled trial. American Journal of Sports Medicine — PubMed PMID: 23328738
Cullinane FL, Boocock MG, Trevelyan FC. (2014). Is eccentric exercise an effective treatment for lateral epicondylitis? A systematic review. Clinical Rehabilitation — PubMed PMID: 23881334
Ritz BR. (1995). Humeral epicondylitis among gas- and waterworks employees. Scandinavian Journal of Work, Environment & Health — PubMed PMID: 8824754
Amako M, Arai T, Iba K, et al. (2022). Japanese Orthopaedic Association (JOA) clinical practice guidelines on the management of lateral epicondylitis of the humerus - Secondary publication. Journal of Orthopaedic Science — PubMed PMID: 34922804
Shiri R, Viikari-Juntura E, Varonen H, et al. (2006). Prevalence and determinants of lateral and medial epicondylitis: a population study. American Journal of Epidemiology — PubMed PMID: 16968862
Sanders TL Jr, Maradit Kremers H, Bryan AJ, et al. (2015). The epidemiology and health care burden of tennis elbow: a population-based study. American Journal of Sports Medicine — PubMed PMID: 25656546
Regan W, Wold LE, Coonrad R, et al. (1992). Microscopic histopathology of chronic refractory lateral epicondylitis. American Journal of Sports Medicine — PubMed PMID: 1280910
Al-Dhafer BAA, Joo HS, Park SY, et al. (2021). Increased expression of macrophages and inflammatory cytokines at tendon origin in patients with chronic lateral epicondylitis. Journal of Shoulder and Elbow Surgery — PubMed PMID: 33197592
Zeisig E, Ohberg L, Alfredson H. (2006). Extensor origin vascularity related to pain in patients with Tennis elbow. Knee Surgery, Sports Traumatology, Arthroscopy — PubMed PMID: 16555106
Zwerus EL, Keijsers R, Colaris JW, et al. (2026). Clinical diagnosis of lateral-sided elbow pain: predictors for recognizing a diagnosis other than tennis elbow. Journal of Shoulder and Elbow Surgery — PubMed PMID: 41192654
Zwerus EL, Somford MP, Maissan F, et al. (2018). Physical examination of the elbow, what is the evidence? A systematic literature review. British Journal of Sports Medicine — PubMed PMID: 28249855
Soares MM, Souza PC, Ribeiro AP. (2023). Differences in Clinical Tests for Assessing Lateral Epicondylitis Elbow in Adults Concerning Their Physical Activity Level: Test Reliability, Accuracy of Ultrasound Imaging, and Relationship with Energy Expenditure. International Journal of Environmental Research and Public Health — PubMed PMID: 36767167
Latham SK, Smith TO. (2014). The diagnostic test accuracy of ultrasound for the detection of lateral epicondylitis: a systematic review and meta-analysis. Orthopaedics & Traumatology: Surgery & Research — PubMed PMID: 24709302
Chen Z, Baker NA. (2021). Effectiveness of eccentric strengthening in the treatment of lateral elbow tendinopathy: A systematic review with meta-analysis. Journal of Hand Therapy — PubMed PMID: 32284219
Kroslak M, Pirapakaran K, Murrell GAC. (2019). Counterforce bracing of lateral epicondylitis: a prospective, randomized, double-blinded, placebo-controlled clinical trial. Journal of Shoulder and Elbow Surgery — PubMed PMID: 30658774
Pattanittum P, Turner T, Green S, et al. (2013). Non-steroidal anti-inflammatory drugs (NSAIDs) for treating lateral elbow pain in adults. Cochrane Database of Systematic Reviews — PubMed PMID: 23728646
Krogh TP, Bartels EM, Ellingsen T, et al. (2013). Comparative effectiveness of injection therapies in lateral epicondylitis: a systematic review and network meta-analysis of randomized controlled trials. American Journal of Sports Medicine — PubMed PMID: 22972856
Karjalainen TV, Silagy M, O’Bryan E, et al. (2021). Autologous blood and platelet-rich plasma injection therapy for lateral elbow pain. Cochrane Database of Systematic Reviews — PubMed PMID: 34590307
Kroslak M, Murrell GAC. (2018). Surgical Treatment of Lateral Epicondylitis: A Prospective, Randomized, Double-Blinded, Placebo-Controlled Clinical Trial. American Journal of Sports Medicine — PubMed PMID: 29498885
Buchbinder R, Johnston RV, Barnsley L, et al. (2011). Surgery for lateral elbow pain. Cochrane Database of Systematic Reviews — PubMed PMID: 21412883
Tang B, Fan C, He Y. (2025). Open and arthroscopic debridement for lateral epicondylitis: a systematic review and meta-analysis based on comparative studies. European Journal of Medical Research — PubMed PMID: 40134024
Coombes BK, Bisset L, Vicenzino B. (2015). Management of Lateral Elbow Tendinopathy: One Size Does Not Fit All. Journal of Orthopaedic & Sports Physical Therapy — PubMed PMID: 26381484

PubMed Topic Searches

The links below run live searches on PubMed, the U.S. National Library of Medicine’s database of biomedical literature. They cover the current evidence on lateral epicondylitis — pathology, conservative care, injections, and surgery.

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Connections

Orthopedics
Achilles Tendinopathy — another tendinosis (not tendinitis) condition with the same biology of collagen degeneration and neovascularization; shares eccentric-exercise rehabilitation principles.
Plantar Fasciitis — overuse enthesopathy at a bony insertion; similar degeneration-not-inflammation pathology and conservative management principles.
Tendinitis — true acute tendon inflammation; distinct from tendinosis but often confused with it; understanding the difference guides treatment.
Meniscus Tear — another common musculoskeletal overuse and degeneration injury; degenerative meniscal tears share the age and occupation risk profile of lateral epicondylitis.
ACL Tear — related orthopedic sports injury; both conditions highlight the limits of corticosteroid injection and the importance of structural rehabilitation.
Osteoarthritis — radio-capitellar OA can coexist with lateral epicondylitis and must be excluded; both are degenerative joint/tendon conditions aggravated by repetitive loading.