PurposeThe present report intended to introduce the hemilaminoplasty technique and evaluate the efficacy of our surgical procedure for LISCs.MethodsThis retrospective study was conducted to analyze the results in 24 LISCs who had undergone our hemilaminoplasty between 2000 and 2012 in two hospitals. All were confirmed by pathological histology and mid- to long-term follow-up had been performed in all cases with a mean of 4.9?years. Using the Japanese Orthopedic Association scoring system (JOA score) and visual analog scale (VAS), symptoms resulting from cyst compression were quantified at various stage for statistical analysis.ResultsThe JOA score and VAS of back/leg pain following surgery were improved significantly (P??0.01). At final follow-up, with normal aging there was a little decrease in JOA score and VAS of back/leg pain, but still significantly improved (P??0.01). Similarly, mean improvement rate of JOA was 83.5?% at 1?year after surgery while 75.6?% at final visit. Successful bone healing was obtained at a mean of 3.8?months after surgery. No cyst reformation and recurrent back/leg pain were observed around the surgical sites.ConclusionsThese lesions could be regarded as a result of facet arthrosis/instability and repetitive facet minor trauma with herniation of synovium through the defective joint capsule. Improvement in lumbago and leg pain may be a consequence of complete cyst resection via hemilaminoplasty plus partial facetectomy with anatomical reconstruction of the posterior spinal elements...
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