Tennis elbow is not arthritis. They are two distinct conditions that affect different structures in and around the elbow. Tennis elbow (lateral epicondylitis) is a tendon problem, involving the tough, fibrous tissue that connects your forearm muscles to the bony bump on the outside of your elbow. Arthritis, by contrast, is a joint problem, where the smooth cartilage cushioning the bones inside the joint breaks down or becomes inflamed. The two can produce overlapping symptoms, which is why people often confuse them.
What Tennis Elbow Actually Is
Tennis elbow develops when the tendons that attach your forearm muscles to the outer elbow become damaged from repetitive use. The specific tendon involved connects a muscle called the ECRB to the lateral epicondyle, the small bony knob you can feel on the outside of your elbow. Over time, repeated gripping, twisting, or extending motions create tiny tears in this tendon. The result is pain and tenderness focused right at that bony point or just below it.
Despite the name, most people who get tennis elbow aren’t tennis players. It’s most common in adults between 30 and 60, and the highest-risk occupations involve repetitive wrist and arm movements: plumbers, painters, carpenters, butchers, and cooks. Racket sports do raise the risk, especially with poor technique, bad equipment, or more than two hours of play per day. Smoking and obesity are additional risk factors.
How Elbow Arthritis Differs
Elbow arthritis involves the joint itself. In osteoarthritis, the cartilage lining the surfaces where bones meet gradually wears away. Without that cushion, bones rub against each other, causing stiffness, pain, and a progressive loss of movement. You might notice a clicking sensation when you rotate or extend your arm. The hallmark of elbow arthritis is decreased range of motion: difficulty fully straightening or bending the arm.
Rheumatoid arthritis can also affect the elbow, but it behaves differently. It’s an autoimmune condition that tends to strike the same joint on both sides of the body, so both elbows are often involved. Osteoarthritis of the elbow is less common than in weight-bearing joints like the knee or hip, but it does occur, particularly in people with a history of elbow injuries or jobs requiring heavy lifting.
Comparing the Symptoms
The pain patterns are the clearest way to tell these conditions apart:
- Location: Tennis elbow pain centers on the outside of the elbow, right at the tendon’s attachment point. Arthritis pain tends to feel deeper, coming from inside the joint itself, and may be felt throughout the elbow rather than at one precise spot.
- What triggers it: Tennis elbow flares with gripping, lifting, or extending the wrist against resistance. Even something as simple as turning a doorknob or shaking hands can provoke it. Arthritis pain worsens with any movement of the joint, especially rotating the forearm or trying to fully straighten or bend the arm.
- Stiffness: Tennis elbow rarely limits your ability to move the elbow joint. You can typically bend and straighten your arm normally, even though it hurts during certain activities. Arthritis progressively restricts range of motion, and morning stiffness is common.
- Clicking or locking: A clicking, catching, or locking sensation in the elbow suggests something is happening inside the joint, pointing toward arthritis or loose bodies rather than a tendon issue.
How Each Condition Is Diagnosed
A physical exam often provides the answer. For tennis elbow, a clinician will press on the bony bump on the outside of your elbow and ask you to extend your wrist or middle finger against resistance. If these motions reproduce your pain at that specific spot, tennis elbow is the likely diagnosis. One common test involves extending your middle finger against downward pressure: pain isolated at the lateral epicondyle is a strong indicator.
Arthritis is assessed differently. The focus is on joint range of motion, checking whether you can fully flex and extend the elbow and whether rotation feels restricted or painful. Imaging plays a bigger role in confirming arthritis. X-rays can reveal joint space narrowing, bone spurs, or cartilage loss. For tennis elbow, X-rays are usually normal because the problem is in soft tissue, not bone. MRI is the best tool for evaluating tendon damage. It can show the extent of tendon tearing and also rule out other conditions like nerve compression that can mimic tennis elbow.
Can One Lead to the Other?
Tennis elbow does not cause arthritis. The tendon damage in tennis elbow occurs outside the joint capsule, so it doesn’t directly affect the cartilage surfaces inside. However, the two conditions can coexist, especially in older adults or people with a long history of repetitive elbow use. When someone with tennis elbow also has joint-related symptoms like decreased range of motion or clicking, intra-articular problems such as arthritis or cartilage damage may be present alongside the tendon issue. This combination can complicate treatment and slow recovery.
Treatment Approaches
The good news about tennis elbow is that it often gets better on its own. The primary treatment is rest from the aggravating activity, combined with targeted exercises to strengthen the forearm muscles and tendons. A physical or occupational therapist can guide this process. A forearm strap or brace worn just below the elbow can reduce stress on the injured tendon during daily activities.
When conservative measures aren’t enough, several options exist. Injections of corticosteroids or platelet-rich plasma into the affected tendon can help. Dry needling, where a needle is used to create small punctures in the damaged tendon to stimulate healing, is another approach. For persistent cases, a procedure called ultrasonic tenotomy uses ultrasound-guided vibration to break down damaged tissue, which is then removed through the needle. Shock wave therapy, which delivers targeted energy pulses to the injured area, can also promote healing and reduce pain.
Elbow arthritis treatment follows a different path entirely. Because the problem is cartilage loss inside the joint, management focuses on maintaining range of motion, reducing inflammation, and slowing further degeneration. Physical therapy for arthritis emphasizes joint mobility and flexibility rather than tendon strengthening. Anti-inflammatory medications address the joint inflammation. In advanced cases, surgical procedures to remove loose fragments, smooth rough bone surfaces, or replace the joint may be necessary. These are joint-focused interventions that would have no relevance to a tendon problem like tennis elbow.
The distinction matters for recovery expectations too. Tennis elbow, while sometimes stubborn, is a condition most people recover from fully with appropriate management. Arthritis is a progressive condition. Treatment can manage symptoms and slow progression, but the cartilage loss itself is not reversible.