Musculoskeletal · PANCE / PANRE

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

Lateral epicondylitis — evidence by intervention. Note the divergence between short- and long-term outcomes for steroid injections.

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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