Background: In the presence of medial meniscus posterior root tear (MMPRT), there is a possibility of reduced compression of meniscal tissue in hyperflexion as the intra-articular mobility of the meniscus increases. This phenomenon can be mimicked during clinical examination. Purpose: To describe, evaluate, and validate the diagnostic performance of a new clinical indicator, the Akmese sign, for the diagnosis of an MMPRT. Study Design: Cohort study (diagnosis); Level of evidence, 2. Methods: In this study, we prospectively enrolled patients aged 18 to 55 years who were scheduled for arthroscopic surgery after a diagnosis of medial meniscal lesion at a single institution between January 2016 and January 2018. All of the patients underwent preoperative examination for the Akmese sign. All surgeries were performed by a single surgeon with more than 5 years of experience in sports injury surgery, who was blinded to the Akmese sign results. Results: A total of 273 patients with a mean age of 42.4 ± 5.3 years met the study criteria. The Akmese sign was identified as positive in 33 patients, and MMPRT was confirmed during arthroscopy in 36 cases. The performance parameters of the Akmese sign were a sensitivity of 86.1%, specificity of 99.1%, Youden index of 0.85, and kappa index of 0.88. Conclusion: This study showed that the Akmese sign is a useful new physical examination test that can help clinicians distinguish MMPRTs from other meniscal medial meniscal pathology.
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