RESUMO
<p><b>OBJECTIVE</b>To study the percutaneous lag screw internal fixation of LX technique for sacroiliac joint diseases or injuries.</p><p><b>METHODS</b>There were 38 patients (25 male and 13 female) with an average age of 35.6 years ranged from 18 to 59 years. Among them, thirty-one cases with trauma of Tile B type, five cases with sacroiliitis and two cases with sacral cystis degeneration. There were 11, 15, 5 cases of Tile B1, B2, B3 type respectively. Pelvic anterior-posterior radiography and spiral computed tomography (CT) were undertaken for all patients. Axis planar, coronal planar, sagittal planar and curve planar of sacral reconstruction of spiral CT images were obtained for every patient. There were 28 cases with delitescence posterior ring injury. All these patients were performed percutaneous lag screw fixation procedures of LX technique under epidural anesthesia. Localization with spiral CT guidance was performed by the radiologist using spiral CT followed by the orthopaedic surgeon. Percutaneous fusion of sacroiliac joint was performed for seven patients who suffered from sacroiliac joint diseases.</p><p><b>RESULTS</b>The blood loss were from 25 to 70 ml (means 36 ml) during operation. All patients were followed up for 3 to 39 months (means 15.6 months). There were no postoperative complications such as infection, fracture nonunion, iatrogenic injuries of nerve and blood vessel, breakage and slippage of fixtors. According to the evaluation of pelvic injuries, the results of imageology were excellent in 34 cases and good in 4, the results of clinical were excellent in 32 and good in 6.</p><p><b>CONCLUSION</b>Percutaneous lag screw internal fixation of LX technique minimizes operation injury during a short procedure with few subsequent complications and allows early mobilization of the patients. That is an ideally safe and effetive operation technique for the sacroiliac joint diseases and injuries.</p>