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Is there a good agreement between MRI readers for Thaunat’s classification in arthroscopically-proven meniscal ramp lesions?

2021; Elsevier BV; Volume: 28; Linguagem: Inglês

10.1016/j.knee.2020.12.029

1873-5800

Francisco Abaeté das Chagas-Neto, Lorena Saraiva de Alencar, Hilanne Linhares Andrade de Aquino, Atul K. Taneja, José Franco Gurgel de Magalhães, Pedro Guilme Teixeira de Sousa Filho, Marcello Henrique Nogueira‐Barbosa,

Sports injuries and prevention

Objective To describe and evaluate the reproducibility by MRI of an arthroscopically-based classification for meniscal ramp lesions. We hypothesize that MRI would present good interobserver and intraobserver reliability to evaluate meniscal ramp lesions. Materials and Methods Twenty MRI of the knee with arthroscopically-proven meniscal ramp lesions were independently assessed by two skilled musculoskeletal radiologists and a third-year radiology resident. Reading was performed in a randomized and anonymous manner, in two steps, with a minimum of 1-month interval between each. Cohen’s kappa coefficient statistic was used to analyze intra and interobserver reading agreement. Associate findings were also categorized. Results From 20 subjects, 17 were male, with mean age of 35 years. MRI reading showed type IV ramp lesion as most prevalent with eight cases (37%), followed by type V – four (21%), type I – four (20%), type III – three, (16%) and type II – one (6%). Regarding ramp lesion types, intraobserver agreement was substantial for both skilled readers (Kappa = 0.72), and moderate for the less experienced reader (Kappa = 0.51); interobserver agreement was moderate. Results between most experienced readers were also analyzed in two categories: stable (types I and II) and unstable (types III, IV and V), also resulting in moderate agreement (Kappa = 0.54). Intraobserver agreement was substantial for both readers (Kappa = 0.68). The most common associate findings were joint effusion (85%), posteromedial capsular structures injury (60%), and medial meniscus extrusion (60%). Conclusion The arthroscopy classification for meniscal ramp lesions stability adapted for MRI has good reproducibility when applied by trained musculoskeletal radiologists.