Agreement and Reliability of Lateral Patellar Tilt and Displacement following Total Knee Arthroplasty with Patellar Resurfacing

John P. Kleimeyer; Thomas J. McQuillan; Diren Arsoy; Vinay K. Aggarwal; Derek F. Amanatullah

doi:10.1055/s-0039-1700843

The Journal of Knee Surgery, Table of Contents

J Knee Surg 2021; 34(07): 717-720
DOI: 10.1055/s-0039-1700843

Original Article

Agreement and Reliability of Lateral Patellar Tilt and Displacement following Total Knee Arthroplasty with Patellar Resurfacing

Authors

John P. Kleimeyer

¹Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
Thomas J. McQuillan

¹Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
Diren Arsoy

¹Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
Vinay K. Aggarwal

¹Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
Derek F. Amanatullah

¹Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California

Abstract

Patellar position and alignment may be measured on routine axial radiographs by various techniques; however, the agreement and reliability of such measurements with a resurfaced patella remain unknown. This study evaluated the range and reliability of lateral patellar tilt and lateral patellar displacement following total knee arthroplasty (TKA) with a resurfaced patella among three observers on 45° Merchant view in 139 TKAs. Intraclass correlation coefficient (ICCs) were used to evaluate intraobserver agreement (IOA) and inter-rater reliability (IRR). IRR was high between each of the observers for lateral patellar tilt (ICC = 0.8) and lateral patellar displacement (ICC = 0.87). IOA was also high upon repeat measurement for the same observer for lateral patellar tilt (ICC ≥ 0.90) and lateral patellar displacement (ICC ≥ 0.86). Therefore, lateral patellar tilt and lateral patellar displacement are reproducible measurements of patellar position on a Merchant axial radiograph following a well-functioning TKA with a resurfaced patella.

Keywords

total knee arthroplasty - patellar resurfacing - patellar tilt - patellar displacement

Full Text

References

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