Evaluation of Knee Kinematics in Single Radius versus Multi-Radii Total Knee Arthroplasty in India Population : A Randomized Control Trial

Lalit Maini¹, Ankur Sharma*¹, Anshul Goel², Amit Sharma¹, Surabhi Rohilla¹, Sunil Jha³, Ashish Indani⁴ and Srinivas Reddy Boreddy⁴

Received: February 20, 2018;   Published: February 28, 2018

DOI: 10.32474/OAJBEB.2018.01.000112

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Abstract

Purpose: Single radius (SR) TKA implant designs are theoretically claimed to overcome “mid-flexion instability” and decrease quadriceps loading encountered in multiple radii (MR) designs. However, limited/no data is available to support SR over MR designs especially in Indian population.

Methods: The present study is a randomized controlled trial, comparing SR (n=17) and MR (n=13) knee kinematics based on clinical scores (Knee Society Score; KSS), radiological (Lotke score), fluoroscopic, and electro-goniometric data in patients. Fluoroscopic evaluation was done by contour based (2D/3D) registration technique.

Results: Patients demographics, KSS, radiological and electro-goniometric data were comparable between SR and MR TKA groups. Anatomically, axial rotation and condylar lift-off data showed insignificant differences. However, MR TKA knees showed higher (P < 0.05) antero-posterior translation compared to SR TKA knees. Similarly, electro-goniometry data has shown no statistical significant difference between both the groups in terms of unloaded flexion-extension, internal-external rotations, walking, and sitto- stand flexion/rotation.

Conclusion: The study showed no statistical significant difference between the two knee implant designs based on clinical, radiological and goniometric data except antero-posterior translation. Mid-flexion instability was not seen with MR TKA which was projected as the major problem with these designs.

Keywords: Electrogoniometry; Fluoroscopy; Knee Society Score; TKA; 2D over 3D registration.

Abstract| Introduction| Material and Methods| Results| Discussion| Conclusion| References|