الفهرس 
Relationship between knee pain and changes of H-reflex
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Abstract
BACKGROUND: Knee pain is a major disorder of all ages. There are different causes of such pain; one of them may have a neural origin. Lumbosacral radiculopathy occurs due to compression of a nerve root by surrounding structures. Hoffman reflex is a good tool for assessing nerve root function. The study aimed to investigate relationship between knee pain and changes of Hoffman reflex. METHODS: thirty six patients (male and female) suffered from unilateral knee pain; age ranged from 25 to 45 years with body mass index less than 30kg\m2 and knee pain persisted for 3 months or more. Knee pain evaluated by the numerical pain rating scale and nerve root function assessed by electromyography (H-reflex). RESULTS: There were 23 patients with lumbosacral radiculopathy; 16 patients had decreased amplitude of H-reflex at affected side relative to H-reflex amplitude at the non-affected side (H\H ratio) and seven patients were with increased latency difference. There was no correlation between knee pain and H/H ratio, There was significant negative correlation between knee pain and latency difference (u = - 0.38, p= 0.05) at p-value <.05. CONCLUSION: The frequency of lumbosacral radiculopathy was 23 patients of 36 patients with unilateral knee pain. There was no correlation between knee pain and H/H ratio, significant negative correlation between knee pain and latency difference