Feasibility study of a mini, bone-attached, robotic system for spinal operations: analysis and experiments.

Study Design: In this investigation, a new concept of a miniature, bone-attached, medical robotic system for spinal operations is presented. As part of the design parameters of the robot, the forces and moments applied by the physician during insertion of Kirschner wires to soft tissues and drilling in hard tissues were examined. A theoretical model for the expected error of the robotic system due to the applied force has been derived and verified experimentally.

Cortical and cancellous morselized allograft in acetabular revision total hip replacement: minimum 5-year follow-up.

Sixty patients who had had revision acetabular components with impaction morselized bone graft were studied in a retrospective, matched-pair analysis. In 30 patients, the morselized graft was derived from cortical bone (group A), and in 30 patients, the graft was derived from cancellous bone (group B). The patients were matched for age, gender, weight, comorbid conditions, Charnley category, severity of bone loss, and allograft preparation.

Cancellous and cortical morselized allograft in revision total hip replacement: A biomechanical study of implant stability.

To restore femoral intramedullary bone stock loss in revision surgery of failed total hip arthroplasties, impacted morselized cancellous allograft is recommended. This study investigated the mechanical properties of both impacted cortical (group A) and cancellous (group B) morselized bone graft for reconstruction of femoral bones. Ten matched pairs of fresh frozen human femora were prepared by over-reaming to create a smooth-walled cortical shell.

Cortical and cancellous morselized allograft in revision total hip replacement.

Fifty patients who had revision femoral components with morselized impacted bone graft were studied in a retrospective, matched-pair analysis. In 25 patients the morselized graft was derived from cortical bone (Group A) and in 25 patients the morselized graft was derived from cancellous bone (Group B). The patients were matched for age, gender, weight, comorbid conditions, severity of bone loss, and allograft preparation.

Intra-synovial, compared to intra-articular morphine provides better pain relief following knee arthroscopy menisectomy.

Purpose: To evaluate the analgesic effect of morphine 1 mg administered into the synovial tissue and the outer third of the meniscus after knee arthroscopy.

Methods: In a prospective, double-blind, randomized study, 60 patients who required elective knee arthroscopy were assigned to two groups: Group A consisted of 30 patients who received a direct injection of morphine 1 mg into either the synovial tissue or the outer third of the meniscus following menisectomy. Group B consisted of 30 patients who received a direct injection of NaCl 0.