2023 ISAKOS Biennial Congress ePoster
Intra- And Inter-Operator Reliability Assessment Of A Novel Extramedullary Accelerometer-Based Smart Cutting-Guide For Total Knee Arthroplasty: An In-Vivo Study
Stefano Zaffagnini, MD, Prof., Bologna ITALY
Domenico Alesi, MD, Bologna ITALY
Arcangelo Russo, MD, San Cataldo ITALY
Mirco Lo Presti, MD, Bologna ITALY
Iacopo Sassoli, MD, Bologna ITALY
Matteo La Verde, MD, Bologna ITALY
Giulio Maria Marcheggiani Muccioli, MD, PhD, Associate Professor, Bologna ITALY
IRCCS Istituto Ortopedico Rizzoli, Bologna, ITALY
FDA Status Cleared
Summary
This study verified the intra- and inter-operator reliability of an extramedullary (EM) accelerometer-based smart cutting-guide for distal femoral resection during primary total knee arthroplasty (TKA)
ePosters will be available shortly before Congress
Abstract
Purpose
To verify the intra- and inter-operator reliability of an extramedullary (EM) accelerometer-based smart cutting-guide for distal femoral resection during primary total knee arthroplasty (TKA).
The hypothesis was a good correlation between operators and a difference < 1°, indicating a good reliability of the device.
Methods
25 not consecutive patients with knee osteoarthritis undergone to primary TKA using an EM inertial-based cutting guide to perform distal femoral resection.
In order to assess the agreement in femoral axis definition of the device, two operators performed three time each the maneuvers necessary to define axis. Inter rater agreement was evaluated with Bland & Altman agreement test.
Intra rater repeatability was evaluated analysing average results distribution of repeated measurements. Accuracy of the device was evaluated comparing differences between intra operative device data with final implant alignment measured on post-operative longstanding x-rays using Students’ t test.
Results
Agreement between the two operators was statistically significant (p<0.05) with a Bias of -0.4°(95%CI -0.6° to -0.2°). Average difference between cut orientation measured with device and final implant position, measured on x-rays was 0.2° (95%CI -1.5° to 1.7°) with no statistical difference between the two measurements. Final implant alignment, measured on x-ray was 90.2°, with 95% of cases distributed within range 88.0° to 92.0° for varus-valgus and 2.8°, with 95% of cases distributed within range 2.0° to 4.0° for flexion-extension.
Conclusions
The inertial-based EM cutting guide used to perform distal femoral resection during primary TKA demonstrated a good intra- and inter-operator reliability in the present in-vivo study.