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Study: No significant difference between mobile, fixed-bearing TKA kinematics
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Although mobile-bearing total knee arthroplasty had certain advantages over fixed-bearing total knee arthroplasty, researchers found no significant differences between the kinematics of the two bearing types.
The researchers randomly assigned 40 knees of 37 patients with more than 120° knee flexion to mobile-bearing total knee arthroplasty (TKA) or fixed-bearing TKA and evaluated knee kinematics using fluoroscopic imaging during step-up activity 1 year after surgery.
Results showed no statistically significant difference in the total extent of rotation for mobile- and fixed-bearing TKA, with a 1.9° tibial external rotation in the mobile-bearing group and 4.2° in the fixed-bearing group, according to the researchers.
Patients who underwent mobile-bearing TKA experienced a wider range of absolute axial rotation due to the axial rotation of the polyethylene insert. However, the polyethylene insert also moved as designed, especially with respect to the self-alignment feature.
Patients who received a fixed-bearing TKA had significantly more posterior medial and lateral condyles, according to study results. The researchers found only minor kinematic differences between the two TKAs. – by Casey Tingle
Disclosure: The authors have no relevant financial disclosures.
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