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.
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