En bloc resection of semi-facet and lamina for thoracic ossification of ligamentum flavum with epidural ahson

张志成(Zhang Zhicheng，Dept Orthop Surg，Beijing Army Gen Hosp，Beijing 100700)…∥Chin J Orthop.－2010，30(11).－ 1039～1043

En bloc resection of semi-facet and lamina for thoracic ossification of ligamentum flavum with epidural ahson

张志成(Zhang Zhicheng，Dept Orthop Surg，Beijing Army Gen Hosp，Beijing 100700)…∥Chin J Orthop.－2010，30(11).－ 1039～1043

ObjectiveTo explore the strategy and outcomes of surgical treatment of thoracic ossification of ligamentum flavum(OLF)，especially combined with ossification of posterior longitudinal ligament，thoracic kyphosis and epidural adhesion.MethodsFifty-three cases of thoracic OLF from January 2003 to December 2009 were reviewed retrospectively.All patients were treated by the methods of en bloc resection of semi-facet and lamina.All patients were followed up for more than half a year，including 32 males and 21 females，aged from 43 to 73 years(average 54.7 years).The lesions located in upper thoracic for 18 patients，and in thoracolumbar for 35 patients.For multi-level or jumping OLF patients，the responsible levels were determined by combination of images and clinical symptoms.For multi-level OLF with ossification of posterior longitudinal ligament(OPLL)or thoracic kyphosis(＞50°)，multi-level pedicle screw fix-ation and correction of kyphosis were performed.For dural adhesion patients，part of cerebrospinal fluid was released with a caudal incision of dural sac resulting in collapse and epidural arachnoid separation.Ossific and adhesion dura mater were removed with integrity of arachnoid.The surgical outcomes were evaluated with preoperative and postoperative thoracic Japanese Orthopaedic Association(JOA)score，Nurick grade and neurologic functional recovery ratio.ResultsFifty-three cases were followed up for 6 months to 6 years，with an average of 18 months.The average preoperative JOA score was 4.3 ±2.3，which can significantly increased to 8.3 ± 1.8 after operation.Postoperative neurologic functional recovery rates were 11%to 80%(average 65.8%)，including excellent in 18 cases，good in 20，fair in 10，and poor in 5.The excellent or good rate was 71.7% .The mean preoperative Nurick grade was 3.7(2 －5 grade)and decreased to 2.3 grade after operation.ConclusionEn bloc resection of semi-facet and lamina is a safe and effective method for treatment of thoracic OLF.For the patients with OPLL or kyphosis，pedicle screws fixation and kyphosis correction was beneficial for recovery of neurologic function of thoracic OLF patients.11 refs，2 figs.

(Authors)