Lateral Epicondylitis (Tennis Elbow)
Tendinopathy of the common extensor origin (ECRB) at the lateral epicondyle from repetitive wrist extension.
Also known as: tennis elbow, lateral epicondylitis, lateral epicondylosis, lateral elbow tendinopathy
Overview
Degenerative tendinopathy (not primarily inflammatory) of the common extensor tendon at the lateral epicondyle of the humerus, predominantly involving the extensor carpi radialis brevis (ECRB) origin. Caused by repetitive overuse of the wrist extensors.
Epidemiology
Most common cause of lateral elbow pain in adults. Peak age 35-55. Affects both sexes equally. Only a small fraction of patients are tennis players — most cases relate to occupational tasks.
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Risk factors
- Repetitive forceful gripping with wrist extension — racquet sports, carpentry, plumbing, painting, computer use with poor ergonomics
- Age 35-55
- Smoking
- Obesity
- Diabetes mellitus
- Coexisting rotator cuff or other tendinopathy
Pathophysiology
Repetitive eccentric loading of the wrist extensors produces microtears at the ECRB origin. The histologic picture is angiofibroblastic hyperplasia (Nirschl) — disorganized collagen, neovascularization, and absence of acute inflammatory cells. This is a degenerative tendinosis, not an inflammatory tendinitis.
Clinical presentation
Symptoms
- Insidious lateral elbow pain, often worse with gripping, lifting, shaking hands, turning a doorknob, or pouring a kettle
- Pain may radiate down the forearm
- Symptoms often persist for weeks to months
- Weakness from pain rather than true motor deficit
Signs / physical exam
- Point tenderness at or just distal to the lateral epicondyle
- Pain with resisted wrist extension (especially with elbow extended)
- Pain with resisted middle finger extension (Maudsley test)
- Pain with passive wrist flexion combined with elbow extension (Mill test)
- Grip strength reduced; consider dynamometer
- Full elbow ROM preserved
Differential diagnosis
- Radial tunnel syndrome — Pain ~3-5 cm distal to the lateral epicondyle, worse with resisted supination; no point tenderness at epicondyle
- Posterior interosseous nerve syndrome — Motor weakness in finger and thumb extension without sensory deficit
- Cervical radiculopathy (C6-C7) — Neck pain radiating to elbow, dermatomal sensory loss, positive Spurling
- Radiocapitellar OA / chondral lesion — Mechanical symptoms, crepitus, X-ray changes
- Elbow synovitis (RA, gout) — Effusion, warmth, elevated CRP, polyarticular pattern
- Plica syndrome — Snapping/clicking; rare
Diagnostic workup
Labs
- Not indicated
Imaging
- Generally NOT needed — diagnosis is clinical
- Plain radiographs only if trauma, atypical features, or chronic refractory symptoms
- Ultrasound — can confirm tendinopathy and rule out tear
- MRI — refractory cases or surgical planning
Diagnostic algorithm
| Treatment | Short-term | Long-term |
|---|---|---|
| Counterforce brace | Helpful | Helpful |
| Eccentric exercise / PT | Moderate | Best evidence |
| Topical NSAIDs | Helpful | Limited data |
| Oral NSAIDs | Helpful | Limited |
| Corticosteroid injection | Helpful at 4-6 wk | WORSE than placebo |
| PRP injection | Modest | May help refractory cases |
| Surgery (ECRB release) | — | Reserved for refractory >6-12 months |
Treatment
First-line
- Activity modification and ergonomic correction — counterforce brace (forearm strap) just distal to the epicondyle can offload the tendon
- Ice after activity
- Eccentric strengthening exercises of wrist extensors (most evidence-based)
- Topical NSAIDs (diclofenac gel) for symptom relief — preferred over oral
- Oral NSAIDs — ibuprofen, naproxen, meloxicam — short course only; limited evidence for long-term benefit
Second-line / adjunct
- Physical therapy — eccentric loading program
- Corticosteroid injection — short-term pain relief at 4-6 weeks but WORSE long-term outcomes than placebo; reserve for severely painful flares and limit use
- Platelet-rich plasma (PRP) — modest evidence; may benefit refractory chronic cases
- Extracorporeal shockwave therapy — mixed evidence
- Surgical release of the ECRB origin — for refractory cases after 6-12 months of conservative treatment
Complications
- Chronic pain and functional limitation
- Steroid-related: tendon weakening, skin atrophy, depigmentation
- Recurrence — natural history is favorable but slow; 80-90% improve within 1-2 years
- Postoperative stiffness or persistent pain (uncommon)
PANCE pearls
- Eccentric exercise of wrist extensors is the most evidence-based intervention.
- Corticosteroid injections offer short-term relief but worsen long-term outcomes — counsel patients accordingly.
- If pain is more distal than the epicondyle and worsens with resisted supination, consider radial tunnel syndrome.
- Counterforce braces are inexpensive and often effective for activity-related pain.
- Natural history is favorable — reassurance that most resolve within 1-2 years.
References
- AAFP 2014 — Treatment of Common Causes of Lateral and Medial Elbow Pain (Johnson et al., Am Fam Physician 2014)
- JOSPT 2022 — Lateral Elbow Tendinopathy: Clinical Practice Guideline (Lucado et al., J Orthop Sports Phys Ther 2022)
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