What Is Lateral Epicondylalgia?

Lateral epicondylalgia (LE) — commonly known as tennis elbow — is a painful condition of the common extensor origin at the lateral epicondyle of the humerus, where the wrist and finger extensor muscles attach. It affects approximately 1–3% of the general adult population, with peak incidence between 35 and 55 years, and has nothing to do with tennis in 95% of cases. The condition is an insertional tendinopathy of the extensor carpi radialis brevis (ECRB) — the primary offending structure — and shares the same degenerative histopathology as Achilles and patellar tendinopathies: disorganised collagen, increased vascularity, neural ingrowth, and the absence of classical inflammatory cells. Despite being called "elbow" pain, the disability is felt throughout daily life — in handshakes, opening jars, lifting a kettle, and any gripping activity — making it a significant occupational and functional burden.

Mechanism of Injury

LE develops from repetitive, forceful wrist extension and forearm supination activities that accumulate tensile and compressive load at the ECRB origin beyond the tendon's capacity for repair. Occupational risk factors include prolonged keyboard and mouse use, manual work involving repetitive gripping and tool use, and plumbing, carpentry, and painting. The ECRB is particularly vulnerable because of its relatively poor vascularity at the proximal attachment and its constant eccentrically loaded role during gripping — the wrist extensors must contract to stabilise the wrist against the flexion force produced by gripping, meaning every grip activity loads the lateral epicondyle. Central sensitisation is a significant feature of persistent LE — explaining why even light touch over the lateral epicondyle can become exquisitely painful in chronic presentations.

Corticosteroid injections: short-term gain, long-term harm: Multiple high-quality trials demonstrate that corticosteroid injection produces superior short-term (six-week) pain relief compared to physiotherapy — but inferior outcomes at one year, with higher recurrence rates. The injection suppresses local pain temporarily but does not address the underlying tendinopathic pathology and may impair collagen synthesis. It should be used judiciously, not as a default first-line treatment.

Evidence-Based Treatment

Progressive loading of the extensor tendon is the cornerstone of LE management. Isometric wrist extension (sustained contractions at 70% maximum voluntary contraction for 45 seconds, four to five repetitions) provides immediate and meaningful analgesia and is an excellent entry point for patients in significant pain. Isotonic loading — progressing from eccentric wrist extension with a dumbbell to concentric-eccentric loading — rebuilds tendon stiffness and collagen organisation over 8–12 weeks. Manipulation of the cervical (C5–C6) and elbow joint has strong evidence for immediate pain reduction and improved grip strength in LE, and should be incorporated early. Dry needling to the ECRB, extensor digitorum, and associated trigger points in the posterior forearm reduces pain significantly and improves function. A counterforce brace worn during provocative activities reduces the strain at the tendon origin and provides symptomatic support during rehabilitation. Activity modification — identifying and temporarily reducing the most provocative tasks — prevents perpetuation of the load-capacity imbalance.

References & Further Reading

  1. Coombes BK, et al. Effect of corticosteroid injection, physiotherapy, or both on clinical outcomes in patients with unilateral lateral epicondylalgia. JAMA. 2013;309(5):461–469.
  2. Bisset LM, Vicenzino B. Physiotherapy management of lateral epicondylalgia. J Physiother. 2015;61(4):174–181.
  3. Rio E, et al. Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. Br J Sports Med. 2015;49(19):1277–1283.