Elbow Pain: Is It Tennis Elbow or Arthritis?

Written by the Nuvirox Research Team

Short answer: the single most useful clue is range of motion. Tennis elbow (lateral epicondylitis) is a tendon condition that causes pain but doesn't restrict how far your elbow can move; osteoarthritis of the elbow joint itself typically does limit range of motion, particularly rotation. Both cause pain on the outer side of the elbow, which is why they get confused.

What is tennis elbow, mechanically?

Despite its name, lateral epicondylitis is more common in people who don't play tennis. It's a degenerative condition of the tendon where the wrist-extensor muscles attach to the outer bony bump (lateral epicondyle) of the elbow, usually caused by repetitive gripping, wrist extension, and forearm rotation — think computer mouse use, manual labor, or racquet sports. Despite the "-itis" suffix suggesting inflammation, histological studies of the affected tissue have generally failed to find classic inflammatory cells, leading researchers to prefer the term "tendinosis" (degeneration) over "tendinitis" for what's actually happening at the tissue level.

How is this different from elbow osteoarthritis?

Elbow osteoarthritis is far less common than knee or hip OA, but when it occurs, it involves the cartilage and bone surfaces of the joint itself — most relevantly here, the radiocapitellar joint, which sits close to where tennis elbow pain is felt. Clinical guidance for physicians specifically flags radiocapitellar joint osteoarthritis as an important differential diagnosis to rule out when evaluating lateral elbow pain, because the two conditions can occupy nearly the same location.

The distinguishing clinical features, per orthopedic and sports medicine literature: with osteoarthritis, there's pain on direct palpation of the joint line itself, plus a reduced range of pronation and supination (the rotating motion of turning your palm up and down). With tennis elbow (lateral epicondylitis), range of motion is not affected — the pain is reproduced by specific tendon-loading tests (resisted wrist extension, gripping tests) rather than by joint rotation itself.

What the broader differential diagnosis includes

Beyond arthritis, clinicians also consider cervical radiculopathy (nerve pain radiating from the neck), radial tunnel syndrome (nerve compression), elbow bursitis, and posterolateral rotatory instability when working through outer-elbow pain. In longstanding or atypical cases, plain X-rays are sometimes used specifically to rule out underlying elbow arthritis, since tennis elbow itself is usually diagnosed clinically without imaging. Neck and shoulder impairments have also been identified as negative prognostic factors for recovery from lateral elbow pain in some studies, which is one more reason a thorough exam — rather than a narrow focus on the elbow alone — tends to produce a more reliable diagnosis and a more effective treatment plan.

What tennis elbow won't involve

Tennis elbow doesn't typically cause joint swelling, doesn't restrict how far you can rotate or bend your elbow, and doesn't show joint-space narrowing or bone changes on an X-ray, since it's a soft-tissue tendon problem rather than a joint-surface problem. If your elbow pain comes with visible swelling, warmth, or a noticeably stiffer range of motion, that pattern points more toward a joint issue than a tendon issue.

Why does this distinction matter practically? Because the two conditions are managed differently. Tennis elbow generally responds to tendon-focused rehab — eccentric strengthening exercises, activity modification, and bracing — while elbow osteoarthritis management focuses more on joint protection, range-of-motion preservation, and in advanced cases, orthopedic evaluation for possible intervention. Treating a joint problem with a tendon-focused rehab plan (or vice versa) delays getting to what actually helps, which is the practical reason a clinician wants to distinguish them rather than just labeling any outer-elbow pain "tennis elbow" by default.

Typical course and management

Tennis elbow tends to be self-limited, typically resolving within one to two years, and most people improve with activity modification, physical therapy, and bracing rather than surgery — a small percentage of persistent cases eventually need surgical release of the affected tendon. Elbow osteoarthritis, by contrast, is a joint-degeneration process managed more like arthritis elsewhere in the body, with an emphasis on activity modification and, in advanced cases, orthopedic evaluation. Other conditions that show up in the broader differential for outer-elbow pain — including radial tunnel syndrome and posterolateral rotatory instability — have their own distinct management pathways too, which is one more reason a clear diagnosis matters more than guessing based on symptoms alone.

FAQ

Can I have both tennis elbow and elbow arthritis at the same time? Yes, they can coexist, particularly in older adults, which is part of why a clinical exam distinguishing tendon-loading pain from joint-line pain and rotation restriction is more reliable than guessing from symptoms alone.

Why is it called tennis elbow if I've never played tennis? The name reflects the classic association with the backhand stroke in racquet sports, but the same repetitive wrist-extension pattern shows up in many everyday and occupational activities, which is why non-tennis-players make up the majority of cases.

Does tennis elbow show up on an X-ray? Not typically — imaging is usually reserved for longstanding or atypical cases specifically to rule out arthritis or other structural issues, since ordinary tennis elbow is a soft-tissue diagnosis made clinically.

What's the simplest test I can try at home to tell them apart? Try slowly rotating your forearm (turning your palm up and down) through its full range; if that specific motion is limited or painful at the joint itself, mention that to a clinician, since restricted rotation points more toward a joint problem than a tendon problem.

Can repetitive strain from a desk job really cause tennis elbow? Yes — the research on lateral epicondylitis specifically lists computer use and other repetitive wrist-extension activities as common contributing factors, alongside occupational lifting and racquet sports, which is part of why the condition is more common in non-tennis players.

From Nuvirox

Why we formulated Joint+ Restore

Joint+ Restore is formulated for people who want consistent daily support for joint comfort and mobility as part of an active lifestyle. We're currently updating our formulation, so we're not listing specific ingredients or dosages here — but the same commitment to picking ingredients with a track record in published human research holds. Every order is backed by our 60-day money-back guarantee, long enough to actually evaluate whether it's working for you.

Learn more about Joint+ Restore →

The bottom line: Tennis elbow and elbow osteoarthritis can both cause outer-elbow pain, but they behave differently — tennis elbow spares your range of motion and responds to tendon-loading tests, while osteoarthritis restricts rotation and hurts directly on the joint line. A short clinical exam usually settles the question, and getting the right diagnosis early tends to shorten the path to the rehab approach that actually fits what's going on.

References

1. Lateral elbow tendinosis: a review of diagnosis and management in general practice. Br J Gen Pract. 2018;68(676):548–549.
2. Lateral epicondylitis of the elbow. StatPearls. PMID: 23398951.
3. Tennis elbow (lateral epicondylitis) differential diagnoses. Medscape/eMedicine.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.