Robert R. Karpman

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A prospective, randomized study was performed to compare early clinical and radiographic outcomes of total knee arthroplasty using either standard or minimally invasive surgical approaches. Fifty-nine patients were randomized into 3 groups: a standard median parapatellar incision (n = 19), a "mini mid-vastus" (n = 20), or a "quad sparing" group (n = 20).(More)
The authors report a retrospective review of 105 patients with ankylosing spondylitis (AS) diagnosed over a 6-year period in Tucson, Arizona. In the series, there were 13 patients with spinal fractures and eight with severe spinal cord injury. Two patients with central cord contusion had no demonstrable cervical spine fracture. Injury was often trivial and(More)
Supplements of glucosamine hydrochloride, low molecular weight chondroitin sulfate, and manganese ascorbate were tested separately and in combination for their ability to retard progression of cartilage degeneration in a rabbit instability model of osteoarthrosis. Computerized quantitative histologic evaluation of safranin O stained sections of the medial(More)
A retrospective review of 56 hip fractures in 52 patients aged 90 years and older was performed, looking specifically at perioperative morbidity and mortality, one-year mortality, and postoperative functional outcome. The one-year mortality rate was 46% as compared to 22% in younger individuals. The presence of cerebral dysfunction preoperatively proved to(More)
Forty patients (44 knees) with unicompartmental arthritis of the knee were reviewed to assess the overall functional result following high tibial osteotomy as compared to unicompartmental prosthetic replacement. All patients were evaluated both pre- and postoperatively using a standardized computer form. Mean followup was 24 months in the osteotomy group,(More)
Revision total hip arthroplasty, particularly femoral component replacement, has proved extremely difficult and has met with frequent complications. Despite a variety of devices and techniques that have been developed to facilitate removal of the femoral stem, the procedure remains difficult. Extracorporeal shock wave lithotripsy (ESWL) is a new technique(More)
Autologous shed blood for autotransfusion was evaluated at four medical centers in a prospective randomized study. One hundred twenty-eight patients were studied after hip replacement, knee replacement, or spine fusion. The efficacy of autologous shed blood in reducing homologous transfusion was evaluated. The relative risk of transfusion with homologous(More)
The purpose of this study was to advance prior techniques and studies regarding the effects of fibular and talar displacement of contact areas of the tibio-talar joint. Type IV supination external rotation injuries were experimentally created on five fresh cadaveric specimens. Tibio-talar contact and peak pressures were measured using Fuji(More)