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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

John P. Kleimeyer
1   Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
,
Thomas J. McQuillan
1   Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
,
Diren Arsoy
1   Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
,
Vinay K. Aggarwal 
1   Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
,
Derek F. Amanatullah
1   Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, California
› Author Affiliations Funding None.
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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


Publication History

Received: 04 June 2019

Accepted: 18 September 2019

Article published online:
07 November 2019

© 2019. Thieme. All rights reserved.

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