BACKGROUND: Entrapment of the superior @entity129 (SCN) in an osteofibrous tunnel has been reported as a cause of @entity1643 ( @entity1643 ). However, there are few reports on the prevalence of @entity74 and there are several reports only on favorable outcomes of treatment of @entity74 on @entity1643 . The purposes of this prospective study were to investigate the prevalence of @entity74 and to characterize clinical manifestations of this clinical entity. METHODS: A total of 834 @entity1 suffering from @entity1643 and/or leg symptoms were enrolled in this study. Diagnostic criteria for suspected @entity74 were that the maximally tender point was on the posterior iliac crest 70  mm from the midline and that palpation of the tender point reproduced the chief complaint. When @entity1 met both criteria, a nerve block injection was performed. At the initial evaluation, @entity1643 and leg symptoms were assessed by visual analog scale (VAS) score. At 15  min and 1  week after the injection, @entity227 levels were recorded. If insufficient @entity158 decrease or recurrence of @entity158 was observed, injections were repeated weekly up to three times. Surgery was done under microscopy. Operative findings of the SCN and outcomes were recorded. RESULTS: Of the 834 @entity1 , 113 (14%) met the criteria and were given nerve block injections. Of these, 54 (49%) had leg symptoms. Before injection, the mean VAS score was 68.6        19.2  mm. At 1  week after injection, the mean VAS score significantly decreased to 45.2        28.8  mm (p   <   0.05). Ninety-six of the 113 @entity1 (85%) experienced more than a 20  mm decrease of the VAS score following three injections and 77 @entity1 (68%) experienced more than a 50% decrease in the VAS score. Surgery was performed in 19 @entity1 who had intractable symptoms. Complete and almost complete relief of leg symptoms were obtained in five of these surgical @entity1 . CONCLUSIONS: @entity74 is not a rare clinical entity and should be considered as a cause of @entity158 . Approximately 50% of @entity74 @entity1 had leg symptoms.

Prospective study of superior XXXX as a potential cause of @entity1643 and leg symptoms.

@entity129 :: ('MESH:D003389', 'Disease') :: ['cluneal nerve'] @entity1 :: ('9606', 'Species') :: ['patients'] @entity1643 :: ('MESH:D017116', 'Disease') :: ['low back pain', 'LBP'] @entity227 :: ('MESH:D014786', 'Disease') :: ['VAS pain'] @entity74 :: ('MESH:D030342', 'Disease') :: ['SCN disorder'] @entity158 :: ('MESH:D010146', 'Disease') :: ['chronic LBP or leg pain', 'pain']
@entity74 :: (MESH:D030342,Disease) :: ['cluneal nerve disorder']
