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Talks and Poster Presentations (with Proceedings-Entry):

H. Zehetgruber, C. Bürger, T. Angeli:
"Intraoperative Measurement of Retropatellar Contact - Ressure During Total Knee Arthroplasty";
Poster: 2005 Annual Meeting, American Academy of Orthopaedic Surgeons, Washington, DC; 2005-02-23 - 2005-02-27; in: "American Academy of Orthopaedic Surgeons", (2005), 1 pages.



English abstract:
TKA systems should include instrumentation that allows precise restoration of overall patellar thickness, to avoid increased postoperative patellar offset.

The purpose of this study was to evaluate intraoperative changes of the retropatellar contact pressure during total knee arthroplasty



Contact pressure between Patella and Femur was measured during dynamic flexion in 4 patients. Tests were performed three times, first after athrotomy, than after implantation of the femur and tibial component and at least after implantation of the patella component. Measurement of the contact pressure was done with sterilized a Tekscanà sensor, flexion was recorded with a sterilized digital goniometer. Additional pre- and postoperative x-rays were analyzed regarding to changes of the femur-patellar offset, patella thickness, q-angle and kondylar-height.



After Implantation of the femoral and tibial component retropatellar peak-pressure increased up to 150% of the initial value. With implanting of the patellar component accession of the peak-pressure up to 380% was observed.

Patella-thickness increased from 24 mm preoperatively to 29mm postoperatively, patellar offset from 19mm to 24mm.



Increased pressure load after implantation of the femural and tibial component was caused by a reduced contact surface between the natural surface of the patella and the surface of the endoprosthesis and may lead to persistent postoperative anterior knee pain. TKA systems should include instrumentation that allows precise restoration of overall patellar thickness, to avoid increased postoperative patellar offset.

Created from the Publication Database of the Vienna University of Technology.