Tennis Elbow: Diagnosis, Rehab, and When to See a Specialist

Tennis elbow — properly called lateral epicondylitis or extensor tendinopathy of the elbow — is one of the most common reasons adults come to clinic with arm pain. Despite the name, most patients we see have never picked up a racquet. The condition is caused by overload of the tendons that extend the wrist and fingers, and it is triggered by anything that asks those tendons to work hard repeatedly: gardening, painting a wall, carrying heavy bags, repetitive computer mouse use, weight training, and yes, occasionally tennis. This article explains what is actually happening in the tendon, the rehabilitation that works, and the limited role for injections and surgery.

What is happening in the tendon

The tendon that joins the wrist extensor muscles to the bony bump on the outer side of the elbow (the lateral epicondyle) has a remarkable but limited capacity to adapt. When demands repeatedly exceed adaptation capacity, the tendon enters a state called tendinopathy — a disorder of collagen disorganisation, neovascularisation (new blood vessel growth), and altered cellular activity. Contrary to the “itis” in epicondylitis, this is not primarily an inflammatory condition. Treatment that targets inflammation alone (rest, ice, anti-inflammatories) gives short-term comfort but does not solve the underlying tendon problem.

Symptoms

The classic picture is pain on the outside of the elbow, sometimes radiating down the forearm, that worsens with gripping, lifting, twisting (turning a doorknob, wringing a cloth), and backhand shots in racquet sport. Pain is reproduced by pressing on the lateral epicondyle and by resisted wrist extension with the elbow straight. Morning stiffness around the elbow is common.

How it’s diagnosed

Diagnosis is clinical. A targeted history and examination is reliable. Imaging is not needed in straightforward cases. We use ultrasound or MRI selectively to confirm severity or rule out other causes when symptoms are atypical, very prolonged, or not responding to rehab.

What works: progressive tendon loading

The strongest evidence in the rehabilitation of tendinopathies is for progressive loading. The principle is to give the tendon a graded mechanical stimulus that drives remodelling, starting at intensities that do not flare symptoms and progressing steadily. The classic programme begins with isometric wrist extension holds (these reduce pain almost immediately for many patients), progresses to slow eccentric loading (lowering a light dumbbell from a wrist-extended position over 3–4 seconds), and finally to heavy slow resistance work with concentric and eccentric phases.

Modifying provocative activity matters too — temporarily reducing keyboard time, using a thicker handle on tools, taking grip breaks during gardening. We do not advocate complete rest; tendons that are unloaded for weeks become weaker and recur.

The role of bracing

A counter-force brace worn just below the elbow during provocative activity reduces the load on the tendon origin. It is not a treatment in itself but it can buy comfort while loading rehabilitation is doing its work.

Injections — when, what, and how often

Cortisone injections give rapid pain relief but do not improve, and may worsen, long-term outcomes if used repeatedly. We use cortisone sparingly — perhaps once, for a patient in acute distress who needs a window to begin rehab. Platelet-rich plasma (PRP) has stronger evidence in chronic tennis elbow that has not responded to rehab and is often the next step. We deliver PRP under ultrasound guidance and pair it with a structured loading programme — the injection alone is not a complete treatment.

Other modalities

Extracorporeal shock wave therapy has reasonable evidence for chronic cases and is a useful office-based option. Dry needling, ultrasound therapy, and laser have weaker evidence and are not routinely recommended.

When surgery is considered

The vast majority of tennis elbow cases resolve with a 3–6 month structured programme. Surgery is reserved for the small minority with persistent disabling pain at 12 months despite high-quality rehabilitation. The operation — open or arthroscopic — releases the diseased portion of the tendon and debrides any abnormal tissue. Outcomes are good for selected patients but the operation is rarely needed in modern practice.

Returning to sport and work

Recovery is rarely linear. Patients often improve substantially in the first 6–8 weeks, plateau briefly, then continue improving with progressive loading. Return to full racquet sport with appropriate technique modification (a heavier racquet, lower string tension, biomechanical attention to the backhand) is realistic by 3–4 months for most patients.