Diagnostic Efficiency of MRI in Child and Adolescent Lateral Discoid Meniscus.

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Abstract

[Indexed for MEDLINE] Conflict of interest statement: The authors declare no conflicts of interest. 18. BMJ Case Rep. 2025 Oct 31;18(10):e264900. doi: 10.1136/bcr-2025-264900. Cyclops lesion post-meniscal repair. Almeida J(1), Morais AI(2), Oliveira P(1)(3), Serdoura F(1), Torres J(1)(3). Author information: (1)Orthopedics and Traumatology Department, Unidade Local de Saúde São João, Porto, Portugal. (2)Orthopedics and Traumatology Department, Unidade Local de Saúde São João, Porto, Portugal anamorais.isabel@gmail.com. (3)FMUP, Porto, Portugal. An adolescent with a knee sprain was submitted to meniscoplasty for a discoid meniscus with anterior horn detachment and posterior horn rupture, achieving a pain-free full range of motion at 5 months. However, he developed knee pain and extension deficit after a year. An MRI indicated anterior arthrofibrosis despite an intact ACL (anterior cruciate ligament), confirmed and treated with arthroscopic debridement. The patient fully recovered.This case underscores the rare incidence of anterior arthrofibrosis post-meniscal repair, indicating it can develop even without ACL reconstruction (ACLR). Its formation may be related to the surgical creation of an anterior working space, similar to that in ACLR procedures, and highlights the importance of considering anterior arthrofibrosis in differential diagnoses for postoperative knee pain and extension loss. Effective management and awareness of potential risk factors are crucial for preventing such lesions. © BMJ Publishing Group Limited 2025. No commercial re-use. See rights and permissions. Published by BMJ Group. DOI: 10.1136/bcr-2025-264900