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Tennis Elbow: Causes and Treatment — Why Rest Alone Isn't Enough

Tennis elbow (lateral epicondylitis) rarely has anything to do with tennis — it most often affects people doing physical work, heavy computer-mouse users, or strength trainers. It isn't classic "inflammation" but a chronic, degenerative change in the tendon that responds poorly to rest alone and, surprisingly, poorly to steroid injections over the long run. We look at what the evidence actually shows about eccentric exercise, braces, and injections.

MNMichał NowakSeptember 16, 202613 min read
Table of contents

TL;DR — key takeaways

A condition that rarely has anything to do with tennis

The name "tennis elbow" (lateral epicondylitis humeri) suggests a sports injury, but in clinical practice only a small fraction of cases have any connection to playing tennis. Far more often, the problem affects people who perform repetitive wrist and forearm movements at work — carpenters, mechanics, painters, massage therapists, musicians, and, in modern life, also people spending many hours a day at a keyboard and computer mouse. The condition is estimated to affect 1-3% of the adult population annually, most often between ages 35-55, with roughly equal frequency in women and men.

At the core of the problem is overload of the extensor carpi radialis brevis (ECRB) tendon at its attachment point to the lateral epicondyle of the humerus. Repetitive, submaximal loads on this tendon — not a single injury — gradually lead to structural changes that show up as pain on the outer side of the elbow, worsening with gripping, lifting objects, or extending the wrist against resistance.

Why the name is misleading

The historical term "epicondylitis" suggests an inflammatory state (the "-itis" ending), but histopathological studies of tissue taken from patients with chronic tennis elbow show a degenerative picture — disorganized collagen fibers, excessive vascular and fibroblast growth (so-called angiofibroblastic hyperplasia) — not typical inflammatory infiltrates. That's why the specialist literature increasingly uses the term "lateral elbow tendinopathy," which has direct implications for treatment: purely anti-inflammatory approaches, like steroid injections, address the symptom rather than the cause.

Who's most at risk

Factors that increase the risk of tennis elbow

  • Work requiring repeated gripping motions and wrist extension under load — carpentry, mechanical work, massage, cooking, painting
  • Intensive, prolonged use of a computer mouse and keyboard, especially with a poorly set up ergonomic workstation
  • Racquet sports (tennis, badminton, squash) — especially with improper backhand technique or too stiff a racquet string tension
  • Strength training with a sudden, large increase in the volume of exercises engaging grip and forearm extensors
  • Age 35-55 — the peak incidence falls in this range, likely from a natural decline in tendon tissue quality with age combined with the accumulation of years of overload
  • Smoking and obesity — both factors are associated with poorer blood supply and connective tissue quality, which impairs tendon regeneration

Why rest alone rarely works

Myth

Since it's caused by overload, the best solution is simply to rest the arm — avoid movements that hurt until the tendon heals itself.

Fact

Complete immobilization can help only in the acute pain phase, but prolonged avoidance of loading doesn't promote regeneration of a degenerated tendon — and according to some studies may actually delay it. Tendon tissue needs controlled, gradually increasing mechanical load to stimulate collagen remodeling and regain strength. That's why the modern approach to elbow tendinopathy centers on exercise programs, not prolonged, passive rest.

This distinction has practical significance: a patient who avoids any forearm loading for many weeks, hoping symptoms will resolve on their own, often returns to the doctor with the same pain two or three months later — not because the tendon failed to heal, but because it was never exposed to the stimulus it needed for tissue remodeling.

Eccentric exercise — the pillar of treatment, backed by research

Eccentric exercises involve controlled lengthening of a muscle under load — for tennis elbow, this is most often slowly lowering a weight held in the hand with the elbow extended, tensing the wrist extensors. This specific type of loading appears to most effectively stimulate collagen remodeling in the degenerated tendon.

A randomized controlled trial of eccentric vs. concentric graded exercise in chronic tennis elbow (lateral elbow tendinopathy)

Moderate evidence

Peterson M, Butler S, Eriksson M, Svärdsudd K · Clinical Rehabilitation · 2014

A randomized trial in primary care in Sweden compared an eccentric exercise program with a concentric exercise program in patients with chronic tennis elbow (symptoms lasting more than 3 months). The group performing eccentric exercises achieved faster pain reduction and about a 10-percentage-point higher response rate at every level of pain reduction compared with the concentric exercise group, though both groups improved relative to baseline.

View study

Eccentric wins, but the margin over concentric is moderate

Moderate evidence

This result doesn't mean concentric exercises are useless — both groups in Peterson's trial showed improvement. It rather means that if you have to pick one type of loading as the basis of a program, eccentric appears to have an edge, which is consistent with similar observations in other tendinopathies (e.g., the Achilles tendon). What remains key, though, is loading the tendon progressively — not the specific direction of movement.

Steroid injections — fast relief, worse outcome after a year

Corticosteroid injections can be a tempting option because they relieve pain quickly and effectively in the first weeks. The problem is that longer follow-up studies show the opposite picture over a one-year horizon — and one of the most cited studies in this field comes from Australia.

Mobilisation with movement and exercise, corticosteroid injection, or wait and see for tennis elbow: randomised trial

Strong evidence

Bisset L, Beller E, Jull G, Brooks P, Darnell R, Vicenzino B · BMJ · 2006

A randomized trial in 198 patients with tennis elbow compared three strategies: a corticosteroid injection, physiotherapy (mobilization with movement and exercise), and a "wait and see" strategy. At 6 weeks, the steroid injection gave the best results (78% improvement vs. 65% in the physiotherapy group). But by 52 weeks the picture had reversed: the recurrence rate was 72% in the injection group vs. 8% in the physiotherapy group and 9% in the "wait and see" group, and long-term outcomes in the injection group were significantly worse than in the other two groups.

View study

Why this paradox matters clinically

A steroid injection can suppress pain effectively enough that a patient returns to their usual activity too soon, before the tendon has had time to remodel — which favors recurrence. This isn't an argument for never using injections, but for not treating them as a first-line treatment or as a substitute for an exercise program. Any decision about a possible injection is best made together with a doctor, especially when other methods have failed.

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What about platelet-rich plasma (PRP)?

Platelet-rich plasma (PRP) injections are sometimes advertised as a more modern alternative to steroids, based on growth factors derived from the patient's own blood. The theory sounds promising, but the hard clinical data are considerably less clear-cut than the marketing from clinics offering this procedure suggests.

Treatment of lateral epicondylitis with platelet-rich plasma, glucocorticoid, or saline: a randomized, double-blind, placebo-controlled trial

Early-stage evidence

Krogh TP, Fredberg U, Stengaard-Pedersen K, Christensen R, Jensen P, Ellingsen T · American Journal of Sports Medicine · 2013

A randomized, double-blind, placebo-controlled trial compared PRP injection, glucocorticoid injection, and saline (placebo) injection in patients with lateral elbow tendinopathy. At 3 months, there was no statistically significant difference between PRP and placebo in pain and disability — both groups, including placebo, showed improvement relative to baseline, suggesting a substantial contribution from the placebo effect and the natural course of the condition to the observed improvement.

View study

A mechanistic hypothesis, not a confirmed clinical advantage

This doesn't mean PRP definitely doesn't work for anyone — studies in this field vary in preparation methodology and injection technique, which makes firm conclusions difficult. It does mean, though, that current evidence doesn't justify treating PRP as a proven, superior first-choice option — and its cost (usually not reimbursed) is worth weighing against the uncertain, preliminary quality of the evidence.

Braces, activity modification, and other supportive methods

Methods that support an exercise program

  • A counterforce brace worn a few centimeters below the elbow — doesn't treat the cause, but can reduce the load on the tendon attachment during everyday activities and make it easier to keep up activity during rehabilitation
  • Temporary modification of the work or sport activity causing pain — changing grip technique, breaks during repetitive movements, rather than avoiding them entirely
  • Correcting computer workstation ergonomics — mouse and keyboard height, forearm support, break frequency
  • A gradual return to racquet sports with correction of stroke technique and appropriate choice of string tension and grip size, ideally under a coach's or physiotherapist's guidance
  • Manual therapy and elbow joint mobilization as a supplement to exercise, following the protocol used in the Bisset et al. trial

When rest and exercise aren't enough — warning signs

When to consult a doctor or orthopedist

Most cases of tennis elbow resolve within 6-24 months with appropriate, consistent conservative treatment — but not all. It's worth seeing a doctor if: pain doesn't improve or worsens despite at least 6-8 weeks of a consistent exercise program; numbness, tingling, or grip weakness suggesting compression of the ulnar or radial nerve appears; pain wakes you at night or occurs at rest, not just under load; or a sudden injury with acute pain and swelling has occurred (which may suggest a different pathology, e.g., a ligament tear). In the small number of cases resistant to conservative treatment (usually after 6-12 months with no improvement), a doctor may consider further imaging or, as a last resort, surgical treatment.

QuestionShort answer
Is it always tennis's fault?No — most cases are related to work or everyday repetitive movements, not sports
Is it an inflammatory condition?In the chronic phase, probably not — histopathology points to degenerative, not inflammatory, changes
What's proven most effective by research?An exercise program, especially with an eccentric component, applied consistently over many weeks
Is a steroid injection a good first choice?Not as a sole method — it gives fast relief but carries a higher risk of recurrence at one year than physiotherapy
Is PRP a proven option?The evidence is still preliminary and inconsistent — it doesn't clearly outperform placebo in well-designed trials

Tennis elbow at a glance

Our editorial recommendation

Tennis elbow is a good example of how decades-old clinical intuition — "it's inflammation, so suppress it and rest" — turned out to be incomplete in light of newer histopathological and clinical research. The most effective, best-supported approach requires patience: gradual, controlled loading of the tendon through an exercise program over many weeks, rather than a quick fix in the form of an injection or complete immobilization.

Steroid injections and PRP may have a place in selected, resistant cases, but neither method replaces the foundation of treatment, which remains a properly designed, progressive exercise program — ideally put together with a physiotherapist, accounting for the specific activity that led to the overload.

The biggest mistake in treating tennis elbow isn't too little rest — it's too little patience. A tendon that's been overloaded for months won't rebuild itself in two weeks, no matter how quickly the pain disappears after an injection.

Michał Nowak, VitMode editorial team

Frequently asked questions

Most cases resolve within a few months to two years with a consistent, progressive exercise program — typically the first clear improvements appear after 6-12 weeks of regular exercise, but full tendon tissue remodeling takes longer than the disappearance of pain itself.

Moderate, controlled pain during exercise (often described as up to 3-4 on a 0-10 scale) is usually acceptable and doesn't indicate worsening damage, as long as it doesn't escalate day to day. Sharp, severe pain or swelling is a signal to reduce the load and discuss the program with a physiotherapist.

No — a counterforce brace reduces the load on the tendon attachment and can make it easier to function during treatment, but on its own it doesn't stimulate tissue remodeling. It works best as a supplement, not a substitute, for an exercise program.

Not always, but it shouldn't be the first choice or the sole method of treatment. The Bisset et al. trial clearly showed a worse long-term outcome for injections compared with physiotherapy, though in selected, resistant cases a doctor may consider such an injection as part of a broader treatment plan.

Tennis elbow (lateral epicondylitis) affects the wrist extensor tendons on the outer side of the elbow, while golfer's elbow (medial epicondylitis) affects the flexor tendons on the inner side of the elbow. The overload mechanism and treatment principles — progressive exercise as the foundation — are very similar in both conditions.

Available well-designed studies, including the randomized trial by Krogh et al., haven't shown a significant advantage of PRP over placebo at 3 months. Given the lack of reimbursement and the high cost of the procedure, it's worth approaching this option with caution and not treating it as a sure solution.

Maintaining wrist extensor strength and endurance through regular, moderate strengthening exercises after the main treatment ends, along with correcting the technique or ergonomics that led to the first episode, significantly reduces the risk of recurrence.

Sources

MN

Michał Nowak

MSc in Clinical Dietetics, certified sports-nutrition coach

Michał started out as a long-distance runner, before an injury forced him to rethink his career. Looking for a faster way back into shape, he discovered sports nutrition and never left — fascinated by the gap between the research and what "everyone knows" at the gym. He completed a degree in clinical dietetics, earned a sports-nutrition coaching certification, and ran his own practice for several years before joining VitMode. His writing keeps returning to one theme: a supplement won't replace the basics, but the right one, at the right time, makes a real difference — and that's the difference he tries to describe precisely, with citations instead of slogans. He still runs, though these days, as he puts it, purely for the fun of it.

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Comments (2)

  • KW

    Kasia W. 2 weeks ago

    Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.

  • MT

    Marek T. a month ago

    Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.