Lateral Elbow Tendinopathy
There is no formal definition. It is generally described as pain at the tendon insertion or myotendinous junction during loading of the wrist extensor muscles. Lateral elbow tendinopathy is also commonly called tennis elbow, lateral epicondylitis, lateral epicondylalgia, and elbow tendinosis/tendinitis.
Lateral elbow tendinopathy is the most common cause of lateral elbow pain.
Common risk factors are summarised below 
- Age 45-54
- Repetitive movements especially wrist extension and supination for at least two hours daily
- Forceful activity (lifting loads over 20kg)
- New or sudden overuse of tendon (e.g. lifting a new baby, new exercise routine, new gardening, handling heavy tools or heavy load)
- Low job control
- Low social support
The highest load at the ECRB tendon is when the elbow is extended and the forearm pronated.
Doesn't increase risk: keyboard use, working with arms above shoulder-height, exposure to hand-transmitted vibrations
Note: Tennis is associated with the condition in less than 10 in 100 patients, and is more common in recreational players. See Hatch et al for discussion about racket grip sizes. 
Poor Prognostic Factors
Poor prognostic factors
- High work physical strain, such as handling tools, handling heavy loads, repetitive movements, and low job control
- Dominant side
- Shoulder or neck pain. Neck pain is more common in those with lateral elbow tendinopathy
- Symptoms greater than 3 months
- Severe Pain 
A longitudinal study of patients with lateral elbow tendinopathy did not find any association between psychological factors and prognosis 
In individuals with lateral elbow tendinopathy there is evidence of heightened nociceptive withdrawal reflexes and widespread mechanical hyperalgesia A subgroup of patients reporting severe levels of pain and disability display cold hyperalgesia (mean, 13.7°C)  Cold pain threshold is an independent predictor of short- and long-term prognosis in untreated individuals with lateral elbow tendinopathy.  cold pain thresholds greater than 13°C have been linked to an increased risk of persistent pain
It is often described as a self limiting condition. A “wait and see” approach can see improvement within one year . A third of patients have prolonged discomfort lasting in excess of 1 year despite interventions. 5% of patients do not respond to conservative physical interventions and undergo surgery.
It is generally stated that the extensor carpi radialis brevis tendon is the structure most commonly implicated. The extensor digitorum or extensor carpi ulnaris may be the culprit if middle finger extension is more painful than wrist extension 
Factors thought to be relevant:
- Repeated microtearing and healing attempts
- Non inflammatory "angiofibroblastic hyperplasia" also known as "neovessels" or simply "angiogenesis"
- Formation of nonfunctional blood vessels
- Collagen scaffold disrupted by fibroblasts and vascular granulation
- Abnormal tissue has a large number of nociceptive nerve fibres.
- Tearing may be primary with degenerative change being secondary or vice versa.
Central neural mechanisms may be at play. Those with affected tendons tend to grip in a flexed wrist position, even with their unaffected side. There is also a bilateral reduction in speed and reaction time. 
Pathology Studies Pathology studies have generally been histological in those undergoing surgery and imaging based.
- Chard et al harvested 20 common extensor tendons in patients having a release procedure, and compared them to nine control biopsies, and performed an unblinded assessment. Common changes were glycosaminoglycan infiltration, new bone formation, fibrofatty change, partial rupture, and fibrocartilage formation. Inflammatory changes were only found in one sample 
- Regan et al undertook a similar smaller study with a blinded assessment. They corroborated the lack of inflammation, but did see hyaline degradation in all samples. They also noted vascular proliferation, fibroblastic proliferation, and calcific debris in some speciments.
- Maufulli et al did an non-controlled ultrasound studyOne study looked at using high definition ultrasound studies in patients with the syndrome of lateral epicondylitis
- Zeisig et al usedh grey-scale ultrasonography and colour doppler in 17 patients in a total of 22 elbows, and compared them to 11 controls with 22 pain-free elbows. In 21/22 of the painful elbows, vascularity was shown. This was in contrast to only 2/22 of pain-free elbows. This was thought to correspond to vasculo-neural growth.
- Tendonosis can be induced in the contralateral limb with unilateral overloading in one rabbit model of achilles tendinopathy
Ultrasound and MRI have high sensitivity but limited specificity. Features seen on imaging include tendon thickening, focal areas of tendon hypo-echogenicity (US), decreased signal intensity (MRI). One meta-analysis of MRI studies found signal changes in 90% of affected and 50% of unaffected tendons . Diagnostic ultrasound by an examiner blinded to status found tendinopathic changes in 90% of patients and 53% of asymptomatic controls.
It is important to note that most studies find a lack of association between the severity of tendon changes on imaging and symptoms in lateral elbow tendinopathy. However one study demonstrated that the presence of a lateral collateral tear and the size of any intrasubstance tendon tear detected by ultrasound is significantly associated with poorer prognosis in patients with lateral elbow pain
- Onset of pain is insidious
- Can be diagnosed using the "Southampton examination schedule"
- All three of epicondylar pain, epicondylar tenderness (assessment with elbow flexed at 90 degrees), pain on resisted extension of the wrist
- Fairly accurate - sensitivity 73%, specificity 97%, kappa = 0.75
- Often also get pain with supination of the forearm, resisted third finger extension (with an extended elbow), pain on lifting a chair with a pronated hand.
- Can get wrist extension weakness
- Range of motion usually normal
- Imaging usually unnecessary, and extend of tendon damage is not correlated with the amount of pain. May be considered if no improvement.
Reproduction of lateral elbow pain during manual palpation and/or active, passive, or combined movements of the cervical spine should raise suspicion of radicular or referred pain
- Neurological examination if indicated (radial nerve function, sensitisation)
- Radial nerve neurodynamic testing: A positive test requires reproduction of the patient’s lateral elbow pain and alteration of symptoms by a sensitization manoeuver, such as cervical lateral flexion or scapular elevation
- Clinical ice pain test: Pain intensity of more than 5/10, after 10 seconds of ice application indicates 90% likelihood of cold hyperalgesia
- Lateral Elbow Tendinopathy
- Referred pain (Cervical spine, Upper thoracic spine, Neuro-myofascial )
- Synovitis of the radiohumeral joint
- Radiohumeral bursitis
- Posterior interosseous nerve entrapment or radial tunnel syndrome
- Osteochondritis dissecans (Capitellum, Radius in adolescents )
- Posterolateral rotatory instability
- If locking consider chondromalacia, osteochondritis, loose bodies
- Doing Nothing or Rest
- Most patients recover at one year with or without treatment
- Avoidance of usual activities or counterforce bracing / Rationale: caused by excessive loads
- Efficacy – no class I or 2 evidence
- Class 3: two studies showing no benefit for rest
- Class 4: most authorities recommend rest for first 2 weeks
There is conflicting evidence for NSAIDs. NSAIDs more appropriate for reactive than degenerative tendinopathy.
- Nitric Oxide Patches
Demonstrated benefit beyond placebo. Class 2 evidence: efficacy depends on appropriate physical stimulus / no effect if patches combined with stretching only. 
- Autologous Blood or PRP
No evidence that this is at all effective beyond placebo. Conclusion from Krogh’s study - "Neither injection of PRP nor glucocorticoid was superior to saline with regard to pain reduction in lateral epicondylalgia at the primary end point at 3 months. However, injection of glucocorticoid had a short-term pain-reducing effect at 1 month in contrast to the other therapies. Injection of glucocorticoid in lateral epicondylalgia reduces both color Doppler activity and tendon thickness compared with PRP and saline." 
Effective exercise programmes incorporate progressive eccentric and isometric strengthening. Flexibility training may also be required. Eccentric exercise can be performed by holding a weight or a taut resistance band with the wrist extended. The wrist is then flexed against resistance.
There are inconsistencies in the methodological quality of research into eccentric strengthening for this condition. High quality research in other tendinopathies, in particular achilles tendinopathy, has shown benefit for including eccentric strengthening in a rehabilitation programme. One systematic review in 2003 showed mixed results. . A more recent review in 2014 found three high quality studies, seven medium quality studies, and two low quality studies. They concluded that the evidence supports the inclusion of eccentric strengthening as part of a multimodal approach to rehabilitation
Some of the better quality studies:
- Standard physical therapy versus standard therapy plus eccentric stregnthening. Patients in the eccentric strengthening group had marked reductions in pain, disability, and improvement in tendon appearance on ultrasound at one month. At completion the eccentric training group had no strength deficit. 
- A similar smaller study found better outcomes in the eccentric strengthening group when using a rubber bar: File:rubber bar lateral elbow.jpg .
See Day et al for an example of an open access comprehensive exercise program(level 5 evidence).
- Rest, avoid or alter activities responsible for symptoms
- Activity Modification
- For tennis players: lighter racket with smaller grip and less string tension, use 2 - handed backhand
- braces, forearm straps, wrist cock-up splints may reduce pain and improve function (level 2)
- Counter-force brace recommended as inexpensive and easy to use. Apply 6-10cm distal to elbow joint.
- topical NSAIDs may help, inconsistent evidence for oral NSAIDs (level 2)
- topical GTN may help for patients having physical therapy (level 2)
- Injection platelet rich plasma (level 2)
Surgery generally involved excision of the degenerative tissue, and release of the tendon from the lateral epicondyle. There are no placebo controlled trials evaluating surgery for this condition.
- Steroid injections;
Peritendinous steroid injections may provide short-term relief (up to 12 weeks), but result in increased pain and recurrence at one year (level 1) Side effects are common, with pain in 50% and skin atrophy in 20 – 30%
|Complete recovery or much improvement at||Normal||Steroid||Physio||Steroid+Physio|
|recurrence at 52w||20%||55%||5%||54%|
Stretching is not recommended due to the compressive loads placed on the tendon. Stretching also causes disuse of the supinator and wrist extensor muscles.
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