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Correlation between the tibial cutting guide/Jig and tibial resections in total knee arthroplasty: a prospective study
ESSKA Academy. MUELLNER T. Nov 8, 2019; 284382; epEKA-46 Topic: Knee
Dr. Thomas MUELLNER
Dr. Thomas MUELLNER
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Correlation between the tibial cutting guide/Jig and tibial resections in total knee arthroplasty: a prospective study

ePoster - epEKA-46

Topic: TKA

Muellner T.1, Raje A.D.2, Angadi D.2
1Evangelical Hospital Vienna, Vienna, Austria, 2Evangelical Hospital Vienna, Orthopaedics, Vienna, Austria

Introduction: Total knee arthroplasty (TKA) is a common operative intervention undertaken in patients with end stage tricompartmental degenerative arthritis. Optimisation of knee function is achieved with restoration of physiological and mechanical parameters. However there is limited literature available correlating the intraoperative measurements of tibial resections and tibial stylus measurements in total knee arthroplasty.
Objectives: The current study aimed to assess the accuracy of intra-operative tibial cutting guide and subsequent bony resections.
Methods: 111 consecutive patients who underwent TKA between 2017 and 2019 were included in the study. Routine pre-operative planning including assessment of type of deformity, operative templates were performed. Surgery was performed as per standard procedures for the respective deformity and implant systems. Intra-operative stylus measurements and thickness of subsequent bony resections were noted. The obtained data was evaluated to assess the accuracy and correlation of the two aforementioned parameters.
Results: 111 patients underwent TKA of which 48 were males and 63 were females. The mean age of the study group was 71.94 ±7.92 yrs. Out of 111 patients,16 had valgus deformity and 95 had Varus deformity. The mean value of the thickness of medial part of tibial cut was 5.55 ±2.06 mm and that of the lateral part of tibial cut was 7.19 ±2.67 mm. The tibial stylus was placed on the medial tibial plateau in majority of patients except for some patients with severe valgus deformity in whom it was placed on the lateral tibial plateau and the mean value of the stylus measurement was 4.32 ±1.79 mm. The correlation coefficient between the intra-operative tibial cuts and the stylus measurement was 0.414 and only 18 patients had the exact same value of intra-operative tibial cut measurement and stylus measurement. The thickness of the blade used to make the tibial cut was 1.35 mm.
Conclusion(s): The results of the current study demonstrate that, poor correlation exists between the stylus measurements and subsequent tibial bony resections in patients undergoing TKA. This was irrespective of implant system (CR,PS) used and the type of pre-operative deformity.
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