Tennis elbow that will not heal: the trigger points behind outer elbow pain

Lateral epicondylar pain is one of the most stubborn complaints in the arm. The standard explanation is a degenerated common extensor tendon, and that is often part of the picture. But Travell and Simons documented decades ago that the muscles attaching near the lateral epicondyle — and some that do not attach there at all — refer pain to the outer elbow with remarkable precision (travell1942, simons2004). A patient can have a tender tendon and active trigger points at the same time, and treating only one of them is a common reason the pain outlasts every injection and brace.

The clinical clue is the character of the pain. Tendon pain is local and load-specific: it hurts at the epicondyle when you grip or lift. Trigger point referral is wider and more impressionistic — an ache that spreads into the forearm, sometimes to the back of the hand, that can appear at rest or at night, and that a firm press on a specific spot in the muscle reproduces exactly (lucas2009). When the familiar pain can be switched on by pressure a few centimetres away from the tendon, the muscle is telling you it is part of the problem.

For the terminology and interpretation used here, compare What are trigger points?; Primary vs secondary trigger points; How to read referred pain maps. These guides distinguish the definition of a trigger point, its classification and the limits of a referred-pain map.

The extensor carpi radialis longus is the prime suspect: its trigger points sit in the muscle belly just below the elbow crease and project pain straight onto the lateral epicondyle, often with a weak, painful grip. The supinator lies deeper, wrapped around the radius; its points produce a stubborn ache right on the epicondyle that survives rest, and they are frequently missed because the muscle hides under the extensor mass.

The brachioradialis — the muscle that forms the front edge of the forearm when you bend your elbow against resistance — refers to the outer elbow and down toward the thumb side of the wrist. And the triceps, surprisingly, can send pain from the back of the arm to the lateral epicondyle; Travell considered it a classic overlooked source (travell1942). The anconeus, a small triangular muscle on the back of the elbow, is a less common but very local contributor.

None of this is visible on an ultrasound or MRI. The examination is the palpation itself: find the taut band, press it, and ask whether that is the pain you know (simons2004).

Start with the extensor carpi radialis longus. Rest your forearm on a table, palm down, and press into the muscle belly two to three centimetres below the elbow crease with the thumb of your other hand or a massage ball. When you find the spot that reproduces your elbow pain, hold steady pressure for 30 to 90 seconds until the ache eases, then slowly open and close the fist a few times. Repeat two or three times a day.

For the supinator, supinate the forearm (palm up) to slacken it, then press deeply along the outer edge of the radius just below the elbow. For the brachioradialis, pinch the front edge of the forearm between thumb and fingers and work down its length. Check the triceps by pressing the back of the upper arm a hand's width above the elbow.

After each session, take the wrist through a gentle stretch — fingers extended, wrist flexed, elbow straight, 30 seconds, twice. Direct pressure and needling have the strongest evidence among passive treatments (cummings2001, espejo2017, sanchez2021), and self-pressure is the home version of the same idea. Keep gripping activities lighter for the two weeks rather than stopping them entirely: complete rest tends to stiffen the system without calming the trigger points (ge2011).

Myofascial referral behaves like a muscle problem: it changes with pressure, position and use, and it eases after release. Pain that does not behave that way deserves a different look. Get assessed rather than self-treating when the elbow is swollen, hot or locked; when the pain followed a fall or a direct blow; when there is numbness or tingling in the ring and little fingers (which points to the ulnar nerve, not the extensors); or when the pain is constant at night and completely indifferent to position.

The same applies if four to six weeks of consistent self-treatment change nothing at all. At that point a clinician can add what home care cannot: a proper neurological examination, imaging where it is genuinely useful, and dry needling of the deeper points such as the supinator, which is difficult to reach effectively with your own thumb (cummings2001, kalichman2010).