Musculoskeletal Medicine & Physiotherapy & Family Medicine
Epicondylitis (tennis elbow)
Lateral epicondylitis—commonly known as tennis elbow—is a painful tendinopathy affecting the insertion of the lateral epicondylar muscles onto the lateral epicondyle of the humerus, primarily involving the extensor carpi radialis brevis (ECR — extensor carpi radialis brevis). Despite the suffix «-itis,» which suggests inflammation, histopathological studies show the absence of classic inflammatory infiltrate in chronic forms: the histopathological picture is that of angiofibroblastic tendinosis (Nirschl 1979)—degeneration of type I collagen into disorganized type III collagen, neovascularization, fibrosis—a degenerative process linked to repetitive mechanical overload rather than true inflammation. This distinction has important therapeutic implications: anti-inflammatory drugs and corticosteroids, which are highly effective in the short term, do not affect the underlying degenerative process and are associated with high relapse rates at 12 months. Lateral epicondylitis affects 1 to 3% of adults aged 35 to 55, with peak incidence between the ages of 40 and 50. Contrary to its name, fewer than 10% of cases occur in tennis players—the vast majority involve workers performing repetitive forearm movements (computer professionals, musicians, plumbers, mechanics, cooks). The natural course is generally favorable: 80 to 90% of patients recover spontaneously within 12 to 18 months, but pain and functional impairment can be significant during this period, justifying active management.
Clinical presentation and differential diagnosis
- Typical presentation : localized pain at the lateral epicondyle of the humerus, sometimes radiating to the dorsal forearm; gradual onset related to repetitive activity (wrist extension, gripping, tennis forehand with faulty technique, prolonged computer mouse use) or after unusual exertion; maximal pain during gripping objects (handshake, lifting a coffee cup, tightening a tool) and with resisted wrist extension; painful palpation of the lateral epicondyle and 0.5–1 cm distally (common extensor origin); grip strength reduced by 20 to 40 % on the affected side
- Diagnostic clinical trials Cozen's test (resisted wrist extension with closed fist, elbow extended — sensitivity 84 %, specificity 78 %); Mill's test (passive stretch of extensors — forearm pronated + wrist flexed + elbow extended — reproduces pain); Chair test (lifting a chair by the back, elbow extended, forearm pronated — reproduces epicondylar pain); grip strength dynamometer: significant reduction vs. healthy side
- Differential diagnoses to know: Radial tunnel syndrome (posterior interosseous nerve compression—a branch of the radial nerve—3 to 5 cm distal to the epicondyle + painful resisted supination + possible paresthesias—may coexist with epicondylitis in 5 to 10 % of cases—electromyogram for confirmation); medial epicondylitis (golfer's elbow—medial epicondyle—painful resisted wrist flexion); elbow osteoarthritis (limited joint mobility + swelling); radial neuropathy (C6–C7); epicondylar bursitis; C6–C7 cervical pathology (referred pain)
- Risk factors: Age 35–55; strenuous work with repetitive motions (handling, vibrating tools); intensive computer work; incorrect sports technique (tennis — grip too small or too large, strings too tight, forehand with wrist flexion); smoking; obesity; diabetes (tendons more vulnerable to degeneration); hypercholesterolemia (lipid deposits in tendons)
- Imaging : not indicated for routine clinical diagnosis; musculoskeletal ultrasound: tendinous thickening + hypoechogenicity + neovascularization on color Doppler — useful if diagnostic doubt or to guide injection; MRI: superior for detecting partial or complete tendon tear (potential surgical indication) — reserved for refractory forms >6 months
Treatment
| Treatment | Mechanism, technique and procedures | Efficiency, duration, and precautions |
|---|---|---|
| Physical Therapy - Eccentric and Isometric Exercises First-line treatment — best long-term prognosis |
Eccentric exercises for the wrist extensors (Tyler twist — Therabar or flexible stick): eccentric contraction — tendon stretching under load → stimulation of type I collagen synthesis + tendon remodeling; standard protocol: 3 sets × 15 repetitions × 2 times/day × 6 to 12 weeks — pain ≤5/10 tolerated during exercise (no pain >5/10 after exercise); isometric exercises in the acute phase (Rio 2015): isometric contraction of the extensors 5 × 45 seconds — immediate analgesic effect demonstrated (corticospinal inhibition of pain) — particularly useful for acute episodes or as a complement to eccentric exercises; HSR (heavy slow resistance) exercises (Coombes 2013 Lancet): progression to heavy loads at slow speed — results superior to eccentric exercises alone on tendon structure; Elbow manipulation via manual therapy (HVBA — high velocity, low amplitude) as a complement to the exercises (Bisset 2006 BMJ — 65 % healing at 12 months vs. 69 % with corticosteroids but lower relapse rate) | Standard-of-care treatment for long-term benefit—superior to corticosteroids at 12 months despite a slower initial improvement (Bisset 2006 BMJ); not covered by RAMQ outside of CNESST or SAAQ contexts — approximate cost 70–100 CAD per session in a private clinic in Quebec — plan for 6 to 12 sessions on average; supervised exercise programs are preferable to home exercises alone for adherence and progression of exercise intensity; gradual return to sports or work as soon as pain is ≤3/10 during activity — do not wait for complete recovery; avoid identified aggravating factors (ergonomic modifications to the workstation: desk height, type of mouse, keyboard — ergonomic assessment recommended if work-related) |
| Bracing and activity modification Mechanical unloading — short-term relief |
Counter-force brace (epicondylar band - elbow strap): elastic band applied 2 to 3 cm distal to the epicondyle - compresses the muscle belly of the extensors → reduces traction on the epicondylar insertion site → partial unloading of the tendon. Brace for the wrist in slight extension (10–15°): immobilizes the wrist in a resting position → reduces stress on the extensors - more useful at night or during specific activities. Activity modification: identification and temporary reduction of aggravating movements (no complete cessation of activity - maintaining pain-free activity recommended). Sports ergonomics (tennis): check grip (appropriate handle size - ring finger test), stringing (18–20 kg tension - avoid excessive tension), racket (medium head - avoid overly stiff rackets), technique (avoid wrist extension during forehand). | Demonstrated short-term benefit (Struijs 2002 Cochrane) — no demonstrated long-term benefit when used as monotherapy; orthoses are an adjunct to exercises — do not use alone as the primary treatment; recommended duration of use: acute phase and during provoking activities (not to be worn continuously — risk of muscle atrophy with prolonged continuous use); available at pharmacies and through physical therapists — low cost (15–40 CAD); not covered by RAMQ but reimbursable by private insurance |
| Pain relief — Topical and oral NSAIDs Short-term pain relief |
Topical NSAIDs: diclofenac gel 1% (Voltaren Emulgel) applied 3 to 4 times daily to the epicondyle for 4 weeks — greater analgesic efficacy than placebo (Cochrane Derry 2015) with minimal systemic effects — First-line treatment for isolated moderate pain or if oral NSAIDs are contraindicated (chronic kidney disease, history of upper gastrointestinal bleeding, anticoagulants); Oral NSAIDs: ibuprofen 400 mg × 3 times daily or naproxen 250–500 mg × 2 times daily × 5 to 10 days — Slightly superior to placebo in the short term — To be used only for acute pain flare-ups (not as continuous treatment — no benefit demonstrated beyond 2 weeks) — Contraindications: chronic kidney disease, active peptic ulcer, heart failure, anticoagulants — PPI for gastric protection if treatment lasts >5 days or patient is >65 years old; acetaminophen 500–1,000 mg × 3–4 times daily: adjunctive analgesic — less effective alone but useful in combination with NSAIDs; local ice 10–15 min × 3–4 times daily: local analgesic and anti-inflammatory effect | NSAIDs act on pain but not on the underlying tendinous degenerative process—do not extend beyond 2 weeks without re-evaluation; topical NSAIDs are preferable to oral NSAIDs if the goal is local analgesia with reduced systemic risk; do not combine two NSAIDs (increased gastrointestinal and renal risk without additional analgesic benefit); inform the patient that NSAIDs improve symptoms but do not accelerate tendon healing—eccentric exercises remain the fundamental treatment |
| Corticosteroid infiltration Short-term efficacy — 12-month inverted effect |
Local corticosteroid injection (10–20 mg triamcinolone or 20–40 mg methylprednisolone) + local anesthetic (lidocaine 1:3–1:10 — 0.5 to 1 mL) directly into the painful site of the epicondyle — «peppering» technique (multiple punctures of the tendon) or a single peritendinous injection; ultrasound guidance recommended to improve accuracy (especially if previous injection was unsuccessful or anatomy is complex); maximum of 2 to 3 injections spaced at least 6 to 8 weeks apart — beyond this, risk of skin atrophy, depigmentation, and tendon weakening (risk of tendon rupture if direct intratendinous injection); post-injection flare: increased pain within 24 to 48 hours following the injection (acute reaction to the corticosteroid—reassure the patient) | Short-term efficacy (6 weeks) superior to physical therapy and placebo — NNT ≈ 2 (Smidt 2002 BMJ) — relief in 70–80% of cases at 6 weeks; reverse effect at 12 months: patients who received injections had more recurrences and poorer outcomes at 12 months than those treated with physical therapy alone (Bisset 2006 BMJ) — «rebound» phenomenon linked to the masking effect of corticosteroids on pain without treating the underlying degenerative process; always combine with an eccentric exercise program started as early as the 2nd week post-injection (pain reduction facilitates engagement in the exercises); local side effects: skin atrophy (10–20% 1–3 years after repeated injections) + skin depigmentation (particularly visible in darker skin tones) + tendon rupture (rare but possible with direct intratendinous injection); covered by RAMQ if performed by a physician |
| Second-line treatments and surgery Refractory forms after 6-12 months |
PRP (platelet-rich plasma): injection of autologous plasma concentrated in growth factors (PDGF, TGF-β, IGF-1) into the degenerated CERC tendon → stimulation of tendon regeneration — superior efficacy to corticosteroids at 12 months in some studies (Mid-2017 Am J Sports Med) but heterogeneity of results — not covered by RAMQ — cost 300 to 600 CAD per injection — 1 to 3 injections spaced 4 weeks apart; extracorporeal shock wave therapy (ESWT): 3 to 5 sessions — neuromodulation mechanism + stimulation of healing — moderate efficacy (Rompe 2007 Am J Sports Med) — not covered by RAMQ — available in private clinics; surgery (Nirschl tenotomy): resection of degenerated angiofibroblastic tissue from the CERC via arthroscopy or open surgery — reserved for refractory cases after >12 months of properly conducted conservative treatment — 85–90% success rate at 2 years — return to work in 6–12 weeks — covered by RAMQ | Before considering surgery, ensure that conservative treatment has been properly conducted (supervised eccentric exercises × 12 weeks + 1-2 injections + ergonomic modification) and that the diagnosis is correct (rule out radial tunnel syndrome—EMG—cervical pathology, or elbow arthritis); percutaneous needle tenotomy (tendon fenestration—PENS) is a minimally invasive alternative to open surgery available in some specialized centers; postoperative rehabilitation is essential (physiotherapy for a minimum of 3 months)—without rehabilitation, the recurrence rate increases; refer to orthopedics or hand surgery after failure of 12 months of well-documented complete conservative treatment. |
ℹ️
Radial Tunnel Syndrome — A Diagnosis Not to Be Missed: Radial tunnel syndrome is compression of the posterior interosseous nerve (deep branch of the radial nerve) in the radial tunnel, located 3 to 5 cm distal to the lateral epicondyle. It coexists with epicondylitis in 5 to 10 % of cases ( «double crush» syndrome). Distinguishing features include maximal pain on palpation 3 to 5 cm distal to the epicondyle (not on the epicondyle itself), pain with resisted forearm supination (compression at the level of the Fröhse arcade), and paresthesias radiating to the back of the hand. EMG/NCS confirms the diagnosis. Epicondylar injections and eccentric exercises are ineffective for radial tunnel syndrome — surgical decompression is often necessary. A missed differential diagnosis explains many «failures» of epicondylitis treatment.
Signs requiring medical re-evaluation
Consult your doctor if your epicondylitis presents with: Weakness or paresthesias of the hand (Associated nerve compression — radial tunnel syndrome — not to be missed); ; Elbow joint swelling + limitation of flexion-extension (arthritis, joint foreign body, fracture - urgent imaging); ; No improvement after 6 to 8 weeks well-managed (diagnostic and therapeutic reassessment); ; Nocturnal pain at rest, intense unrelated to the activity (mentioning a bone tumor or cervical pathology).
Consult at Clinique Omicron
Clinique Omicron physicians evaluate and treat lateral epicondylitis—clinical diagnosis, prescription of physiotherapy, pain relief, corticosteroid injections if indicated, and referral to orthopedics or hand surgery for refractory cases. Consultations are available at our service points in Quebec and via telemedicine. To make an appointment, visit cliniqueomicron.ca.
The content of this page is for informational purposes only and does not substitute for the advice of a qualified healthcare professional. Any neurological deficit or pain resistant to treatment requires medical re-evaluation.
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