Cementless Bipolar Hemiarthroplasty of Hip Fracture in Patients on Hemodialysis / 대한고관절학회지

PURPOSE: This study analyzed the clinical and radiologic results and complications in patients with chronic renal failure who underwent cementless bipolar hemiarthroplasty for treatment of hip fractures. MATERIALS AND METHODS: Between January 2003 and February 2010, we performed 36 consecutive cementless bipolar hemiarthroplasty procedures in 35 patients with hip fracture who were on hemodialysis for chronic renal failure. Clinically, postoperative Harris hip score, inguinal and thigh pain, and orthopaedic and medical complications were investigated. Radiologically, we examined bone ingrowth, osteolysis, loosening, and nonunion. RESULTS: According to the Harris hip score grading system, the average postoperative score was 85.7 and the function before the injury was restored in 29 cases. Postoperatively, four patients experienced mild inguinal pain and four patients experienced mild thigh pain. One patient experienced severe thigh pain. Orthopaedic complications(6 cases, 16.7%) included mild hematoma(3 cases), superficial wound infection(2 cases), and dislocation(1 case). Medical complications(10 cases, 27.8%) included sepsis(5 cases), multiple organ failure due to aggravation of underlying diseases(2 cases), ulcer perforation(2 cases), and aspiration pneumonia(1 case). Five patients had died within one year (mortality, 13.9%). Except for loosening of the femoral stem in one case, bone ingrowth was observed in all cases. None of the patients had osteolysis and nonunion. CONCLUSION: Although cementless bipolar hemiarthroplasty was considered as an effective treatment in patients with hip fractureon hemodialysis due to favorable results at midterm follow-up, close attention for the postoperative medical complications due to poor general condition is needed.

Paraparesis due to Posterior Migration of Ruptured Disc in the Adjacent Segment after Spinal Fusion: Unusual Junctional Problem / 대한척추외과학회지

Posterior epidural migration of sequestered lumbar disc fragments is an uncommon event. We present here an especially uncommon case involving a patient with paraparesis that was due to posterior migration of a ruptured disc in the adjacent segment after spinal fusion. The patient had a herniated lumbar disc in a diseased spinal junction with sequestered fragments that were located posterior to the thecal sac.

Contributing Factors of Radial Nerve Palsy Associated with Humeral Shaft Fracture

PURPOSE: To analyze related factors of radial nerve palsy in patients with humeral shaft fractures. MATERIALS AND METHODS: We reviewed 107 paients with humeral shaft fracture between January 2000 and June 2007. Thirteen patients had radial nerve palsy after trauma and 9 patients after the operation. We analyzed contributing factors of radial nerve palsy associated with humeral shaft fracture including the cause of trauma, location and pattern of fracture, surgical approach and tourniquet application in cases of plate fixation, the exploration for the nerve and the time for operation. RESULTS: The difference in the incidences of radial nerve palsy after trauma and operation was not significant according to the location and pattern of fracture. The tendency of higher rate of radial nerve palsy after trauma in oblique or comminuted fractures, and after operation in spiral fractures was observed. The operation using intramedullary nailing and radial nerve exploration significantly reduced the incidence of radial nerve palsy after operation (p=0.01 and p=0.02). Posterior approach in open reduction and plate fixation showed a tendency of lower incidence of radial nerve palsy after operation (p=0.78). In logistic regression analysis, radial nerve exploration was the only significant factor that reduced the possibility of radial nerve palsy after operation (17.27: odds ratio, p=0.02). CONCLUSION: In humeral shaft fractures, we should take into consideration whether intramedullary nailing is possible or not. In cases of anterior or anterolateral approach of open reduction and plate fixation, radial nerve should be carefully inspected. In most cases, we recommend radial nerve exploration in order to minimize the possibility of radial nerve palsy after operation.

Comparison of Monoblock and Modular Femoral Stem on Isolated Acetabular Revision with Use of Uncemented Cup

Purpose: The purpose of our study was to assess the clinical and radiological results of isolated acetabular revision and the differences in the results between monoblock and modular femoral stems. Materials and Methods: Between October 1991 and June 2002, 39 patients (39 hips) underwent isolated acetabular revisions with use of uncemented cups and bone grafts. The mean period of follow-up was 5 years 3 months (range, 2 years 1 month to 9 years 8 months). The mean age of the patients at the time of the surgery was 51 years old (range, 26 to 75 years old). The monoblock femoral stems were used in 19 hips and the modular femoral stems were used in 20 hips. The monoblock stems were retained without exchange provided that there was no gross scratch on the femoral head and the femoral stem was confirmed to be stable and fixed intraoperatively. In the modular stems, the femoral heads were always exchanged with new ones. Results: The mean Harris hip score improved from 57 to 87 points. Radiologically, all the stems retained at surgery remained well osseointegrated without osteolysis. Re-revisions of the acetabular components were performed in 5 hips using monoblock stems due to periacetabular osteolysis caused by excessive wear of polyethylene and subsequent loosening of the cups in 3 hips and mechanically unstable acetabular cups without osteolysis in 2 hips. The mean wear rate of polyethylene coupled with the monoblock stem was 0.27 mm/year which was greater than the 0.11 mm/year in the cases with modular stems. Conclusion: To prevent failure of acetabular cups that may occur later by excessive wear of polyethylene, we recommend revision of the well-fixed monoblock femoral stems even though there is no gross scratch on the femoral heads of the monoblock stems.