Patient Specific Instrumentation (PSI): Early Results in a Danish Orthopaedic Department

Katrine Borum, Thomas Houe, Claus A. Olsen, Henrik Morville Schrøder

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Introduction: A new way of improving quality and logistics in Total Knee Athroplasty (TKA) surgery might be Patient-Specific Instrumentation (PSI), providing cutting guides and predetermining component sizes from a MR scan preoperatively.
Methods: A retrospective review of 38 patients operated at Næstved Hospital with a TKA using PSI. All knees were operated between October 2014 and June 2015. We searched the medical records, The Danish Knee Arthroplasty Register and the files from the Zimmer® PSI- online management system.
Results: 42 patients were selected for PSI. 4 patients dropped out. Thus 38 patients were reviewed: 16 men, mean age 66, 1 year (50-82), BMI 29 (21-44), all suffering from osteoarthritis. It took 70, 8 days (32-139) from indication to operation. Intraoperatively, 12 of the 38 (31,6%) operations were converted to conventional technique, because the predetermined size did not fit. 9/12 of the converted patients got larger sizes that pre-planned, equally divided between femoral and tibial components. The converted operations had an operating time of 57, 9 minutes compared to 54, 4 minutes using PSI. In the Danish Knee Arthroplasty Register (2013) the operating time was on average 68 minutes.
Conclusion: With an average time from indication to operation of almost 71 days, and a conversion rate of 31, 6% (12/38), our early results with PSI were not good. However
TidsskriftClinics in Surgery
Udgave nummer1309
StatusUdgivet - 2017


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