Selection of proximal fusion level for adult degenerative lumbar scoliosis.

Introduction: There is controversy regarding the appropriate proximal fusion level for adult degenerative scoliosis. Ideally, the horizontal vertebra is chosen for the upper instrumented vertebra to create a balanced spine. Fusion to T10 is recommended to prevent junctional problems at the proximal adjacent segment.

Total hip arthroplasty using S-ROM prosthesis for dysplastic hip.

Purpose: The purpose of this study was to evaluate the clinical and radiological results of total hip arthroplasty using a proximal modular femoral stem in patients who had secondary coxarthrosis associated with a dysplastic hip.

Materials And Methods: Forty-two patients (45 hips) with secondary coxarthrosis were evaluated after undergoing primary total hip arthroplasty using an S-ROM proximal modular femoral stem. The average follow-up was 80 months (range: 60 to 96 months).

Risk factors of sagittal decompensation after long posterior instrumentation and fusion for degenerative lumbar scoliosis.

Study Design: A retrospective study of clinical results of operative treatment for degenerative lumbar scoliosis.

Objective: To determine the risk factors of sagittal decompensation after long instrumentation and fusion to L5 or S1.

Summary Of Background Data: Little is known about the risk factors for sagittal decompensation, which was defined in this study as sagittal C7 plumb falling anterior >8 cm from the posterosuperior corner of the sacrum.

Long-term results of total hip arthroplasty with an extensively porous coated stem in patients younger than 45 years old.

Purpose: This study analyzed the long-term results of cementless total hip arthroplasty using an extensively porous coated stem in patients younger than 45 years old.

Materials And Methods: The clinical and radiographic results of 45 hips from 38 patients who underwent cementless total hip replacement arthroplasty with an AML prosthesis were reviewed retrospectively. The average follow-up was 12 years (range, 10-15 years).

Arthrodesis to L5 versus S1 in long instrumentation and fusion for degenerative lumbar scoliosis.

There is a debate regarding the distal fusion level for degenerative lumbar scoliosis. Whether a healthy L5-S1 motion segment should be included or not in the fusion remains controversial. The purpose of this study was to determine the optimal indication for the fusion to the sacrum, and to compare the results of distal fusion to L5 versus the sacrum in the long instrumented fusion for degenerative lumbar scoliosis.

Complications in posterior fusion and instrumentation for degenerative lumbar scoliosis.

Study Design: Radiographic analysis was performed retrospectively. Outcomes and complications were collected prospectively.

Objectives: To assess complications after posterior fusion and instrumentation for degenerative lumbar scoliosis, to determine risk factors of complications, and to analyze the clinical outcomes of surgery.

Lipoma arborescens of the knee.

Lipoma arborescens are rare lesions, typically located in the knee. They have a predilection for the suprapatellar pouch in the knee joint, but can also occur in any area of the knee joint. Magnetic resonance imaging of lipoma arborescens often reveals subchondral bone cyst and/or bone erosions, and there may appear to be a correlation between lipoma arborescens and osteoarthritis.

Biologic modification of ligamentum flavum cells by marker gene transfer and recombinant human bone morphogenetic protein-2.

Study Design: The study involves an in vitro experiment using human ligamentum flavum (LF), adenovirus lacZ construct (Ad/lacZ), and recombinant human bone morphogenetic protein-2 (BMP-2).

Objectives: To demonstrate the feasibility of marker gene transfer to human LF cells and the effect of BMP-2 on the osteogenic differentiation of human LF cells.

Summary Of Background Data: BMP-2 is a widely known pivotal osteoinductive agent.

Measurement of polyethylene wear in total hip arthroplasty--accuracy versus ease of use.

The aim of this study was to compare the accuracy of four different methods for measuring wear using an apparatus that simulates known amounts of three dimensional wear. Wear was measured using the manual methods reported by Charnley, Livermore, Dorr and Wan and the computerized method reported by Devane. Only the method reported by Devane measured the three-dimensional (superior and anterior) wear with a reasonable accuracy, with a mean measurement error of 0.