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Intra and Interobserver Agreement Regarding the Walch Classification System for Shoulder Joint Arthritis
Lauro José Rocchetti Pajolli1, Marcelo Casciato Carlini1, Isabella Ferrari1
1Departamento de Ortopedia e Traumatologia, Escola Paulista de Medicina, Universidade Federal de São Paulo (Unifesp), São Paulo, SP, Brasil.
Abstract:
Objective To evaluate the inter- and intraobserver agreement regarding the Walch classification system for shoulder arthritis. Methods Computed tomography scans of the shoulder joint of adult patients were selected between 2012 and 2016, and they were classified by physicians with different levels of expertise in orthopedics. The images were examined at three different times, and the analyses were evaluated by the Fleiss Kappa index to verify the intra- and interobserver agreement. Results The Kappa index for the intraobserver agreement ranged from 0.305 to 0.545. The inter-observer agreement was very low at the end of the three evaluations (κ = 0.132). Conclusion The intraobserver agreement regarding the modified Walch classification varied from moderate to poor. The interobserver agreement was low.
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