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Lateral elbow pain is common in musculoskeletal practice and is frequently diagnosed as tennis elbow, or lateral elbow tendinopathy (LET).
In many cases this is appropriate, but not every painful lateral elbow originates from the common extensor tendon.
This becomes particularly important when a patient fails to follow the expected clinical course. Repeatedly treating presumed tendinopathy without reconsidering the diagnosis can delay appropriate investigation and management.
For referrers, the key question is therefore not simply
“Does this patient have tennis elbow?”
but…..
“Does the clinical presentation still fit the diagnosis I have made?”
LET typically involves the common extensor tendon origin, particularly the extensor carpi radialis brevis (ECRB).
Although the term lateral epicondylitis remains widely used, persistent cases are better understood as tendinopathic rather than simply an acute inflammatory process.
Typical features include:
Diagnosis is usually clinical. However, when the location, behaviour or severity of symptoms does not fit this pattern, particularly after appropriate rehabilitation, the differential diagnosis should be reconsidered.
| Clinical feature | Lateral elbow tendinopathy | Radial tunnel syndrome | Cervical radiculopathy |
| Typical pain location | Lateral epicondyle/common extensor origin | Deep proximal forearm pain, often 3–5 cm distal to lateral epicondyle | Neck/scapular region with possible radiation into arm/forearm |
| Tenderness | At or close to lateral epicondyle | More distal over radial tunnel/supinator | Local elbow tenderness may be absent |
| Provocation | Resisted wrist extension and gripping | Resisted supination; sometimes middle-finger extension | Cervical movement/neural provocation |
| Neurological symptoms | Not typical | Usually pain without objective sensory loss | Paraesthesia, sensory change, weakness or altered reflexes may occur |
| Useful clue | Clear relationship to tendon loading | Deep ache distal to expected tendon pain | Symptoms extend beyond a local elbow presentation |
| If not improving | Reconsider loading, diagnosis and coexisting pathology | Consider specialist assessment | Complete neurological/cervical assessment and investigate as indicated |
No single examination test should be used in isolation.
The location, behaviour and overall pattern of symptoms are often more informative than an individual provocative test.
Radial tunnel syndrome (RTS) is one of the more challenging differential diagnoses.
It is generally described as pain associated with irritation or compression of the deep branch of the radial nerve/posterior interosseous nerve as it passes through the radial tunnel. Diagnosis can be difficult and the condition may coexist with LET.
One of the most useful clues is where the patient hurts.
LET usually produces maximal tenderness around the lateral epicondyle. With RTS, symptoms tend to sit further distally, often approximately 3–5 cm below the lateral epicondyle over the supinator/radial tunnel.
Patients may describe a deeper proximal forearm ache. Resisted supination can reproduce symptoms, while resisted middle-finger extension is also traditionally used, although individual provocative tests have limited diagnostic certainty.
Importantly, uncomplicated RTS is primarily considered a pain syndrome.
Objective motor weakness should prompt consideration of posterior interosseous nerve palsy or another neurological disorder.
Not all elbow pain originates at the elbow.
Cervical radiculopathy, particularly involving C6–C7, can produce symptoms extending towards the lateral arm, elbow and forearm.
Consider a cervical or neurological source where lateral elbow pain is accompanied by:
A cervical and neurological screen is particularly valuable in patients who have undergone prolonged local elbow treatment without meaningful improvement.
Persistent or atypical lateral elbow pain may also originate from structures within the elbow itself.
Radiocapitellar pathology may cause lateral-sided pain associated with joint loading, rotation, stiffness, crepitus or loss of movement.
Synovial plica, osteochondral lesions or loose bodies should be considered when patients report clicking, catching or locking.
Posterolateral rotatory instability can produce pain, clicking, apprehension or a sense of instability, particularly following previous trauma or dislocation.
These presentations can easily be missed if all lateral elbow pain is initially grouped under a diagnosis of tennis elbow.
A non-responder does not necessarily have severe tendinopathy.
LET and radial tunnel symptoms can coexist, while cervical or intra-articular pathology may mimic tendon pain.
Successful rehabilitation requires progressive loading, but the dose matters. Occupational demands, sport, gym activity and rehabilitation exercises should be considered together when assessing total upper-limb load.
Wrist extensor loading is important, but shoulder strength, kinetic-chain function, sporting technique, occupational ergonomics and repetitive gripping demands may all influence the load reaching the elbow.
In longstanding presentations, pain severity does not necessarily correlate directly with local structural pathology. Sleep, stress, fear of movement, reduced load tolerance and altered pain processing can all contribute.
Injection treatment requires careful patient selection.
Corticosteroid injection may provide short-term symptomatic relief in LET, but short-term improvement should not be confused with superior long-term outcome.
Randomised evidence has demonstrated higher recurrence and poorer one-year outcomes following corticosteroid injection compared with placebo despite early symptomatic benefit.
Other treatments, including platelet-rich plasma (PRP), have been investigated, although evidence is mixed.
For a patient with persistent symptoms, the priority should therefore be to revisit the diagnosis and rehabilitation history before simply escalating treatment.
Imaging is generally unnecessary in a classic presentation of LET.
Consider further investigation when:
Ultrasound can assess the common extensor tendon dynamically, and also give a good image of whether there is inflammation, fluid or a tendon tear.
X-ray may be useful for suspected bony or degenerative pathology
MRI provides broader assessment of tendon, ligament, cartilage, bone and intra-articular structures.
Imaging findings should always be correlated with the clinical presentation.
Most lateral elbow pain is benign, but consider urgent investigation or referral in the presence of:
Specialist referral does not necessarily mean surgery.
It can be particularly valuable in clarifying the diagnosis and determining the appropriate next investigation or treatment.
Consider referral when symptoms remain significant despite well-structured conservative management; the diagnosis is uncertain; radial nerve involvement is suspected; neurological findings are present; or the patient describes locking, catching, instability or significant restriction.
Referral is also appropriate where imaging identifies substantial tendon, ligamentous or intra-articular pathology, or where persistent symptoms are significantly restricting work, sport or everyday function.
The key principle is simple:
Failure to respond should trigger reassessment before it triggers escalation of treatment.
Persistent “tennis elbow” may be difficult-to-treat tendinopathy. But sometimes, it isn’t tennis elbow at all.
Coombes, B.K., Bisset, L., Brooks, P., Khan, A. and Vicenzino, B. (2013) ‘Effect of corticosteroid injection, physiotherapy, or both on clinical outcomes in patients with unilateral lateral epicondylalgia: a randomized controlled trial’, JAMA, 309(5), pp. 461–469.
Coombes, B.K., Bisset, L. and Vicenzino, B. (2015) ‘Management of lateral elbow tendinopathy: one size does not fit all’, Journal of Orthopaedic & Sports Physical Therapy, 45(11), pp. 938–949.
Karanasios, S. et al. (2021) ‘Exercise interventions in lateral elbow tendinopathy have better outcomes than passive interventions, but the effects are small: a systematic review and meta-analysis’, British Journal of Sports Medicine, 55, pp. 477–485.
Levina, Y. and Dantuluri, P.K. (2021) ‘Radial tunnel syndrome’, Current Reviews in Musculoskeletal Medicine, 14, pp. 205–213.
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