Plateau-patella angle: An option for the evaluation of patellar height in patients with patellar instability.

Autor: Bonadio MB; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil. Electronic address: bonadio@usp.br., Helito CP; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil., do Prado Torres JA; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil., Gobbi RG; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil., Pécora JR; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil., Camanho GL; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil., Demange MK; Knee Surgery Division, Institute of Orthopedics and Traumatology, University o São Paulo, São Paulo, Brazil.
Jazyk: angličtina
Zdroj: The Knee [Knee] 2017 Mar; Vol. 24 (2), pp. 340-344. Date of Electronic Publication: 2017 Feb 05.
DOI: 10.1016/j.knee.2017.01.006
Abstrakt: Background: Patellar instability is a debilitating disease. An important factor related to recurrent dislocation is patellar height. A new method of patellar height measurement, the plateau-patella angle (PPA), was proposed in 2011. However, to date, there is no study evaluating the use of this method in patients with patellar instability. The aim of this study was to evaluate the PPA in patients with recurrent patellar dislocation.
Methods: This was a retrospective evaluation of the radiographs of 78 knees with patellar instability. Patellar height was measured using the Insall-Salvati (I/S), Caton-Deschamps (C/D) and Blackburne-Peel (B/P) indices and the PPA. The qualitative and quantitative correlations between the various methods and between observers were calculated.
Results: The PPA had a Pearson correlation of 0.76 (P<0.001) with the I/S index, 0.78 (P<0.001) with the C/D index and 0.90 (P<0.001) with the B/P index. In the qualitative correlation using the Spearman coefficient, the PPA had a correlation of 0.52 (P<0.001) with the I/S index, 0.72 (P<0.001) with the C/D index and 0.70 (P<0.001) with the B/P index. The correlations between the conventional methods were as follows: 0.57 (P<0.001) between the I/S and C/D indices; 0.61 (P<0.001) between the I/S and B/P indices; and 0.73 (P<0.001) between the C/D and B/P indices.
Conclusion: The determination of the PPA is a reproducible method that is consistent with the methods currently used to measure patellar height in patients with recurrent patellar dislocation.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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