Radial Tunnel Syndrome in Resistant Lateral Epicondylitis

Ultrasonographic and Electrophysiological Evaluation of The Presence of Radial Tunnel Syndrome in Patients With Resistant Lateral Epicondylitis

Lateral elbow pain can be difficult to diagnose because of the different pathologies or combinations of pathologies that can cause this clinic. Although lateral epicondylitis is the most common cause of lateral elbow pain, symptoms of radial tunnel syndrome may masquerade as lateral epicondylitis or they can be seen together with rate of 21-41%. The aim of the study is; to evaluate the presence of radial tunnel syndrome in the patients who have resistant lateral epicondylitis.

Lateral epicondylitis (LE), also known as "tennis elbow," is an overuse syndrome of the common extensor tendon (CET), predominantly affecting the extensor carpi radialis brevis. History and physical examination including manual provocation tests are key elements for the diagnosis. Ultrasound imaging of the CET is an important complementary method to the clinical diagnosis of LE. It provides information about the severity of the disease with evidence of tendon thickening, focal/diffuse areas of decreased echogenicity in the tendon, epicondylar cortical irregularity or spur formation, and increased vascularity in case of local inflammation depicted by power- Doppler imaging. Radial tunnel syndrome (RTS) is a dynamic/intermittent compression neuropathy of the radial nerve, where different structures can potentially compress the nerve. Local inflammatory and/or vascular changes (scarring, fibrosis), which are seen in LE may lead to compression of the radial nerve or its branches (especially the deep branch) at the radial tunnel. While RTS can often be the cause of refractory LE, some patients with LE actually have RTS concomitantly. The diagnosis of RTS is difficult/controversial due to inconclusive findings on electrophysiological tests and its close relationship with LE. Ultrasound is a superior imaging modality that can be used as an adjunct to electromyography for the evaluation of peripheral nerve problems. It can be used to diagnose compression neuropathies and to identify the entrapment site of the nerve. For the exact diagnosis of RTS complete relief should be achieved with a nerve block at the radial tunnel. Patients who have RTS coexisting with LE (18-43%) usually experience incomplete relief. The purpose of the study is; to evaluate the RTS and LE with physical examination, special clinical tests, electrophysiological and ultrasonographic examinations and, to confirm the presence of RTS accompanying LE with the evaluation of clinical findings after the posterior interosseous nerve and lateral epicondyle diagnostic injections.

Patients diagnosed with lateral epicondylitis with physical examinations will be evaluated with electrophysiology After electrophysiological evaluations, patients' effected extremity evaluated with ultrasonography for lateral epicondylitis and radial tunnel syndrome and compared with uneffected side 30 minutes after posterior interosseous nerve block with 1 cc 2% lidocaine with USG guide, full examination will be repeated for evaluation of NRS score changing to exact diagnose of radial tunnel syndrome 30 minutes after lateral epicondyle 1 cc 2% lidocaine injection with USG guide, full examination will be repeated for evaluation of NRS score changing to final diagnose of lateral epicondylitis

Change from Baseline Pain via Nurmerical Rating Scale at 30 Minutes after PIN/Lateral Epicondyle Injection

Pain of the participants will be assessed by one of the most commonly used pain scale "numerical rating scale". It is numeric version of visual analog scale in which a patient selects a whole number (0-10 integers) that best reflects the intensity of his/her pain. The 11-point numeric scale ranges from '0' representing "no pain" to '10' representing "pain as bad as you can imagine". Participant is asked to indicate rates of their pain on the day of presentation during resting, during function and physical examination as a baseline and, 30 minutes after PIN injection for each, 30 minutes after lateral apicondyle injection for each.

Handgrip strength was measured by using a Jamar Hand Dynamometer with patients seated, their elbow by their side and flexed to right angles, and a neutral wrist position. Three measurements were performed for both side, and the mean score was recorded (effected site and dominancy were noted)

PRTEE is a validated pain severity and functional disability scale that assesses pain (5 questions graded 0 to 10) and functional disability (10 questions graded 0 to 10). Functional scores are then halved and added to pain scores. The minimum score is 0 (no pain or disability) and the maximum is 100 (severe pain and disability)

The DASH is a validated questionnaire designed to measure upper limb disability and symptoms. Functional domains include physical, social, and psychological. It uses a single-scale, 30-item questionnaire of upper extremity function and symptoms. The minimum sum score is 30 points; the maximumscore is 150 points

SF-36 is a popular instrument for evaluating Health-Related Quality of Life and commonly used, general health assessment that is reliable and valid for overall outcome. It measures eight scales: physical functioning, role physical, bodily pain, general health, vitality, social functioning, role emotional, and mental health

Inclusion Criteria: Aged 18-65 years Had persistent lateral elbow pain at least 6 months' duration with suspected lateral epicondylitis Be able to understand enough Turkish to complete the outcome questionnaire Patients whose informed consent was obtained for paticipation in the study Exclusion Criteria: Fibromyalgia History of surgery in the elbow History of fracture that cause the deformity at radius/ulna Pregnancy or breastfeeding Inflammatuar arthropathy in upper extremities Osteoarthritis in the upper extremities Neurological disabilities that effect the upper extremity functions Cervical radiculopathy that effect the level of C6-C7

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