Biomedical subjects

Hartmuth Kiefer

Publications and source records attributed to Hartmuth Kiefer.

3 recordsLinked to original sources

PubMed2005

Consistency of implantation of a total knee arthroplasty with a non-image-based navigation system: a case-control study of 235 cases compared with 235 conventionally implanted prostheses.

The aim of the study was to assess the consistency of the non-image-based navigation system OrthoPilot, Aesculap, Tuttlingen, Germany, in total knee arthroplasty (TKA) implantation in 5 European centers. Two hundred thirty-five TKAs implanted with this navigation system were matched (according to severity of the preoperative coronal deformation and body mass index) to a historical control group of 235 TKAs implanted with a conventional technique. Consistency of implantation was studied on a 3-month postoperative radiological control with coronal long-leg and sagittal standard x-rays. The use of the OrthoPilot navigation system allowed a statistically significant improvement in the consistent placement of both tibial and femoral components. In accordance with current literature, survival of the navigated implanted prostheses is expected to be longer.

Adult↗

PubMed2005

OrthoPilot total hip arthroplasty workflow and surgery.

To analyze the workflow and navigation principles of the OrthoPilot total hip arthroplasty (THA) Version 2.0 (B. Braun-Aesculap, Tuttlingen, Germany), a consecutive series of 60 patients was used to compare the navigated intraoperative data and postoperative measurements of stem and cup position. Within the safe zone, 96.3% of 54 acetabular cups were positioned. The rotational accuracy of femoral instruments was 65 degrees in 41 THAs. The femoral offset was medialized by 6.05 mm in 76% and lateralized by 2.1 mm in 14%. The data for leg length and range of motion from 60 THAs and the navigated data were similar. Thus, the first clinical validation of the workflow of the OrthoPilot THA Version 2.0 is encouraging.

Arthroplasty, Replacement, Hip↗

PubMed2003

OrthoPilot cup navigation--how to optimise cup positioning?

UNLABELLED: The kinematic cup navigation procedure is a surgically simple technique for improving the precision of cup placement. Without CT scans, a reduction of cup malpositions is possible. The rate of desired cup inclination and anteversion angles is markedly increased as shown by the first results of 147 navigated cups. While the inclination is reached precisely with a tendency to a slightly larger angle than desired, the postoperative anteversion angle shows a somewhat bigger variation than the intraoperatively navigated angle with a tendency to less anteversion. This might be due to a lack of information about the real pelvis position during X-ray control. CLINICAL RELEVANCE: dislocations of the prostheses might be reduced significantly. The kinematic cup navigation with the use of the OrthoPilot is an additional and useful tool for the surgeon. The procedure is simple, quick, and cost effective, does not cause specific complications, and does not require additional CT or MRI scans. Further improvement can be expected by additional hip stem navigation techniques in the near future.

Aged↗