Sensitivitas Dan Spesifitas Tes Provokatif Dan Pengukuran Latensi H Refleks Pada Sindrom Piriformis

Abstract

Background Piriformis syndrome (PS) is one causes of buttock and hip pain which is caused by pressure of sciatic nerves on piriformis muscle. PS is sometime misdiagnosed because of similar clinical signs and symptoms with other lower back pain diagnosis such as Hernia Nucleus Pulposus (HNP), Sacroiliac joint pain, facet joint pain. Gold standard diagnosis of PS is diagnostic block injection. However, provocative test and prolonged H reflex on EMG might be also standard diagnostic of PS.

Aim Understand the sensitivity and specificity of provocative test and prolonged H reflex to diagnose PS.

Method 72 patients with suspected PS who came to Neurology OPD in period of August- December 2017 were testing with physical examination (provocative test) and Electromyography test of H reflex. PS is diagnosed by positive diagnostic block injection. Data was proceeded with SPSS 20 version.

Result 72 patients with buttock pain which diagnosed with PS were dominated by female gender than male with ratio 1:3 with housewives as majority of work. Most age groups were 48.6% elderly (age more than 60 years old). Provocative tests result of Freiberg, FAIR, Beatty, Pace Sign, Hip Abduction sensitivity were 52.30; 66.15; 53.84; 46.15; 55.32 and specificity were 100; 42.85; 71.42; 71.42; 57.14. While sensitivity and specificity of prolonged H reflex more than 1.86 msec were 69.23 and 28.59. Combination of 3 provocative tests (FAIR, Freiberg and Beatty) resulted highest sensitivity and specificity in this study as 71.42 and 100.

Conclusion Provocative test and prolong H reflex can be supported diagnosis of PS. However both tests might not be comparable yet than diagnostic block injection as gold standard of PS. Combination of provocative test increased the sensitivity and specificity of provocative test than single test only.