Golf looks gentle. It is not. A full swing loads the medial elbow, the lead-side wrist and the lumbar spine in a very specific way, and does it several hundred times a week for anyone who plays seriously. When something in that chain gives way, the resulting pain is usually diagnosed on MRI, not on X-ray, not on ultrasound, and rarely on clinical examination alone. This piece is the honest map of what to scan, when to scan it, and how the imaging changes what happens next.
One-line answer
For golfers with medial elbow pain, lead-wrist pain or lumbar pain that has not settled after six weeks of sensible loading, a musculoskeletal MRI of the symptomatic region is the right next test, and in the UK in 2026 that is a private scan inside a week or an NHS scan inside three to five months.
Medial epicondylitis vs UCL sprain: same pain, different treatment
Both problems present as pain on the inside of the elbow that is worse at the top of the backswing and through impact. That is where the similarity ends. Medial epicondylitis is a degenerative tendinopathy of the common flexor origin, treated with load management, an eccentric loading programme, and sometimes a corticosteroid or platelet-rich plasma injection. A partial or full ulnar collateral ligament sprain is a structural ligament injury with a much longer recovery, sometimes requiring bracing or surgical reconstruction, and it is often accompanied by a subtle valgus laxity that clinical examination alone can miss.
On MRI the difference is unmistakable. Tendinopathy shows increased signal and thickening of the common flexor tendon at its origin. A UCL injury shows increased signal within the ligament itself, sometimes with partial tearing or a T-sign at the ulnar attachment. Treating the first as the second wastes months. Treating the second as the first can make it worse.
The other reason to image is the ulnar nerve, which runs immediately behind the medial epicondyle. An MRI shows nerve calibre, position and any surrounding oedema, which matters when the patient is describing pins and needles into the ring and little finger as well as the medial pain.
Lead-side wrist: hook of hamate fracture (invisible on X-ray)
This is the injury that most often catches golfers out. The hook of the hamate is a small bony projection into the palm on the ulnar side of the wrist. In a mishit shot, particularly one that catches the ground fat, the butt end of the club drives directly into the hook and can fracture it. The symptoms are ulnar-sided palm pain, weak grip, and pain when gripping the club at address on the lead side.
Plain wrist X-rays miss most of these fractures. The bone projects into the palm and overlies other structures on standard views. Even a dedicated carpal tunnel view shows only a proportion. MRI shows both the fracture line and, more importantly, the bone-marrow oedema surrounding it. Oedema tells you the fracture is acute and symptomatic, rather than an old asymptomatic non-union that happens to be visible on the scan.
The clinical importance is that untreated symptomatic hook of hamate fractures can go on to non-union and rupture of the ring and little finger flexor tendons, which then need surgery. Getting the diagnosis right early, from a proper wrist MRI, changes that trajectory.
| Injury | Where it hurts | Best test |
|---|---|---|
| Medial epicondylitis (golfer's elbow) | Inside of the elbow, worse at impact | Elbow MRI |
| UCL sprain of the elbow | Inside of the elbow, with valgus laxity | Elbow MRI, sometimes MR arthrogram |
| Hook of hamate fracture | Ulnar palm, weak grip on lead side | Wrist MRI (X-ray usually normal) |
| ECU tendon subluxation | Ulnar wrist, painful click on rotation | Dynamic ultrasound or wrist MRI |
| Lumbar disc or facet strain | Lower back, worse on rotation and extension | Lumbar MRI |
| Trail-arm SLAP or posterior labral tear | Deep shoulder pain, painful across body | Shoulder MR arthrogram |
Lead-side wrist: ECU tendon subluxation
The extensor carpi ulnaris runs in a fibro-osseous sheath on the ulnar side of the wrist. In golfers, particularly those with a strong lead-hand grip and a lot of forearm rotation through impact, that sheath can tear and the tendon can subluxate out of its groove on supination and clunk back into place on pronation. The patient describes an audible or palpable click on the ulnar side of the wrist, sometimes painless at first and progressively more painful.
Dynamic ultrasound is the ideal first test because it captures the tendon moving in and out of the groove in real time. MRI is the better second test if ultrasound is equivocal, because it shows the state of the subsheath itself, any associated triangular fibrocartilage complex (TFCC) injury, and bone-marrow oedema in the distal ulna. Treatment ranges from immobilisation and activity modification through to surgical reconstruction of the subsheath in symptomatic cases.
Lumbar spine strain and facet joint arthropathy in golfers
The modern golf swing is a huge rotational load on the lumbar spine, biased through the L4-L5 and L5-S1 segments. The two problems that turn up on MRI in golfers of every level are disc pathology (bulge, protrusion or extrusion, sometimes with a Modic change in the adjacent vertebral body) and facet joint arthropathy (synovitis, capsular hypertrophy and, in older players, subchondral cysts).
Not every scan finding is symptomatic. Asymptomatic disc bulges are extraordinarily common in adults over forty, and treating an incidental finding is one of the fastest ways to make a golfer worse. What matters is correlating the MRI with the pattern of pain. Facet-driven pain is worse on rotation and extension, better on flexion, and typically off-centre. Discogenic pain is worse on flexion and sitting, and often centred. A good musculoskeletal radiologist writes a report that matches the anatomy to the clinical picture, rather than listing every finding without context.
Red flags that push the scan up the urgency ladder are worth naming plainly: any leg weakness, saddle numbness, bladder or bowel change, or unexplained weight loss. These are not "golf injuries" and warrant an urgent MRI regardless of season or timing.
