Tennis is one of the few sports that stresses every joint in the upper limb, hard, on every stroke. A serve loads the shoulder in end-range external rotation, drives the elbow through valgus, and finishes on a wrist that is snapping through pronation. Do that a few thousand times a season and things start to give. The trouble is that upper-limb tennis injuries do not present neatly. Lateral elbow pain might be a tendon, or a ligament, or a nerve. Wrist pain on the backhand might be a TFCC tear, or a scapholunate injury, or a small hook of hamate fracture. This piece is the honest guide to which MRI catches which, at which joint, and how to time the scan so the report is worth what you pay for it.
This is written for club players, county players and the odd touring pro who has ended up on our concierge line at 10pm on a Sunday. The principles are the same. The physics of the scanner does not care about your ranking.
One-line answer
If the pain is at the outside of the elbow, start with ultrasound; escalate to MRI if it does not settle in six weeks. If it is on the ulnar side of the elbow with a valgus catch, go straight to MRI. If it is ulnar-sided wrist pain that clicks, book an MR arthrogram. If it is deep shoulder pain that wakes you at night, book a shoulder MRI, and if there is a clicking or catching sensation with it, ask for an MR arthrogram to look for a labral tear.
Tennis elbow: lateral epicondylitis MRI vs ultrasound
Lateral epicondylitis, the classic tennis elbow, is a degenerative tendinopathy of the common extensor origin, most often extensor carpi radialis brevis. In 2026 the first-line imaging for it in the UK is still high-resolution ultrasound, not MRI. Ultrasound is faster, cheaper, and does the two things that matter: it confirms the diagnosis and it lets a clinician stage the tendon in real time under dynamic loading.
MRI earns its place when the picture is not clean. That means symptoms lasting more than three months, failure of a structured rehab programme, night pain, a mechanism that included a distinct pop, or clinical suspicion of an associated UCL sprain, radial tunnel syndrome or a partial tendon tear. In those situations the extra information from MRI - depth of the tear, bone marrow oedema at the lateral epicondyle, adjacent ligament involvement - changes the plan.
| Presentation | First-line imaging | Escalate to MRI when |
|---|---|---|
| Classic lateral epicondylitis, under 6 weeks | Ultrasound | Rarely needed |
| Lateral pain not settling at 6 to 12 weeks | Ultrasound then MRI | Considering injection or surgery |
| Medial elbow pain (golfer’s elbow) with valgus stress catch | MRI from the start | Immediately, to assess UCL |
| Distinct pop, swelling, functional loss | MRI from the start | Immediately |
| Ulnar nerve symptoms with tingling into ring and little finger | MRI plus nerve conduction studies | Immediately |
UCL sprain in the elbow: Tommy John equivalent
The ulnar collateral ligament of the elbow is the ligament famous for ending baseball pitchers’ seasons. It does the same job in tennis, restraining valgus load on the serve and on heavy topspin forehands. In tennis players it tends to present less dramatically than in a pitcher - a nagging ache on the inside of the elbow, a sense that the arm is not stable at the top of the serve, sometimes ulnar nerve symptoms with it.
UCL injury is an MRI diagnosis. Ultrasound has a role in expert hands, but the standard of care for suspected UCL sprain in a tennis player is a dedicated elbow MRI, ideally on a 3T scanner, and often an MR arthrogram if a partial deep-fibre tear is on the differential. Missed UCL tears in throwers and servers become chronic medial elbow instability, and the treatment window narrows the longer they go unrecognised.
TFCC tears at the wrist: MRI vs arthrogram
Ulnar-sided wrist pain is the classic tennis wrist injury, especially in players who hit a heavy Western-grip topspin forehand or a two-handed backhand. The structure most often involved is the triangular fibrocartilage complex, the TFCC, which sits between the ulnar head and the carpus and takes load on ulnar deviation and pronation.
A plain 3T wrist MRI will pick up most central TFCC tears, ulnar-sided bone marrow oedema and any accompanying extensor carpi ulnaris tendinopathy. Where it can miss things is on the peripheral edge of the TFCC, and on partial-thickness scapholunate ligament tears. If a serious player is heading toward a decision about arthroscopy, the more sensitive scan is the MR arthrogram: dilute gadolinium contrast is injected into the wrist joint, and the study is then performed. Leakage of contrast through a torn structure makes tears that are otherwise hidden much easier to see.
For a competitive player with clicking ulnar-sided wrist pain, an MR arthrogram up front saves a repeat scan and often saves a week off the court.
Rotator cuff tears in tennis
The tennis shoulder is famously durable and famously abused. What most club players call a torn rotator cuff is more commonly rotator cuff tendinopathy with an element of subacromial impingement. What tour-level and older players actually tear is usually the supraspinatus, at its insertion on the greater tuberosity, sometimes with a partial-thickness infraspinatus involvement. Full-thickness tears in players under 40 are uncommon and usually traumatic.
A standard shoulder MRI on a 3T scanner is the right test. It distinguishes tendinopathy from partial-thickness tear from full-thickness tear, sizes the tear, and reports the degree of muscle atrophy and fatty infiltration - which is the single most important prognostic sign for whether a tear is repairable or not. That last variable is why an MRI, and not just an ultrasound, is worth doing when a full-thickness cuff tear is suspected in a player who wants to keep playing.
