Description
Purpose: Total Knee arthroplasty (TKA) has proven to be a successful procedure. However, about 20% of patients are dissatisfied. The influence of rotational positioning of prosthetic components as a cause of anterior knee pain have been studied. The objective of this study was to analyze if the rotational positioning of prosthetic components may cause anterior knee pain following total knee arthroplasty.
Methods: A single-center cross-sectional retrospective study was conducted. A total of 160 patients with a minimum of 1 year follow-up after TKA were selected. The final sample consisted of 133 patients divided into a control group and pain group. Demographic variables, implanted prosthetic model, functional scales (WOMAC and EVA for pain assessment) and the rotation of the prosthetic components were recorded by means of CT-scan image analysis.
Results:
The calculation of the Intraclass-Correlation-Coefficient (ICC) gave a high degree of inter-observer agreement in the CT analysis . No differences in the analysis of prosthetic component rotation, combined rotation and rotational mismatch were found between groups (P<0,05). The analysis of the relationship between patellar fitting and rotation of the components with the presence of pain also showed no significant differences (P<0,05).
Conclusion: The results confirm that the malrotation of prosthetic components has no influence on the presence of pain at a minimum of one year follow-up after TKA implantation.
