Thomas J Heyse1, Carsten O Tibesku2. 1. Department of Orthopedics and Rheumatology, University Hospital Marburg, Germany. 2. Sporthopaedicum Straubing, Bahnhofplatz 27, 94315 Straubing, Germany. Electronic address: carsten@tibesku.de.
Abstract
BACKGROUND: Patient-specific instrumentation (PSI) was introduced in an attempt to reduce positional outliers of components in total knee arthroplasty (TKA). It was hypothesized that PSI could help with the positioning of femoral components in optimal rotational alignment. METHODS: A magnetic resonance imaging (MRI) analysis of 94 patients following TKA was conducted. Of these, 46 operations were performed using PSI and 48 using conventional instrumentation. The rotation of the femoral components was determined in the MRI and deviations>3° were considered outliers. Data were analyzed for positional outliers, observer reliability, and a variance comparison between implant groups. RESULTS: There was excellent inter- and intraobserver reliability with low standard deviations for the determination of femoral component rotation. There were significantly more outliers in the conventional (22.9%) group than in the PSI group (2.2%, p=0.003). CONCLUSION: In this setup, PSI was effective in significantly reducing outliers of optimal rotational femoral component alignment during TKA.
BACKGROUND:Patient-specific instrumentation (PSI) was introduced in an attempt to reduce positional outliers of components in total knee arthroplasty (TKA). It was hypothesized that PSI could help with the positioning of femoral components in optimal rotational alignment. METHODS: A magnetic resonance imaging (MRI) analysis of 94 patients following TKA was conducted. Of these, 46 operations were performed using PSI and 48 using conventional instrumentation. The rotation of the femoral components was determined in the MRI and deviations>3° were considered outliers. Data were analyzed for positional outliers, observer reliability, and a variance comparison between implant groups. RESULTS: There was excellent inter- and intraobserver reliability with low standard deviations for the determination of femoral component rotation. There were significantly more outliers in the conventional (22.9%) group than in the PSI group (2.2%, p=0.003). CONCLUSION: In this setup, PSI was effective in significantly reducing outliers of optimal rotational femoral component alignment during TKA.
Authors: F Zambianchi; A Colombelli; V Digennaro; A Marcovigi; R Mugnai; F Fiacchi; D Sandoni; A Belluati; F Catani Journal: Knee Surg Sports Traumatol Arthrosc Date: 2015-12-24 Impact factor: 4.342
Authors: Tilman Pfitzner; Matthew P Abdel; Philipp von Roth; Carsten Perka; Hagen Hommel Journal: Clin Orthop Relat Res Date: 2014-07-15 Impact factor: 4.176
Authors: Matthew P Abdel; Sébastien Parratte; Guillaume Blanc; Matthieu Ollivier; Vincent Pomero; Elke Viehweger; Jean-Noël A Argenson Journal: Clin Orthop Relat Res Date: 2014-03-07 Impact factor: 4.176