Failure of the Mecron screw-in ring.

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studies showed disc herniation at L4-L5 or L5-S1 . Of the other two patients, both of whom had a slightly positive knee-flexion test, one had a mild disc bulge at L4-L5 and the other had no evidence of disc disease. Of the 32 patients with positive studies, 27 had a large protrusion or an extruded or sequestrated fragment ; the other five had medium or small disc protrusions. A moderately or markedly positive knee-flexion test correlated well with an extruded or sequestrated disc. The SLR test was positive in 28 of the 32 patients and negative or equivocal in four. No patient had simultaneous positive results from the femoral-nerve-stretch test and the knee-flexion test.