Article Details

Posterior medial meniscal root (PMMR) tears compromise meniscal hoop stresses and can accelerate joint degeneration if untreated. While common in older adults and often linked to ligament injuries in youth, isolated PMMR tears in skeletally immature athletes are rare. We report a 15-year-old baseball player who sustained an acute, isolated PMMR avulsion during a hyperflexion injury while sliding into base. Examination revealed pain with deep flexion and a positive McMurray test without instability. MRI confirmed a full-thickness PMMR avulsion with mild extrusion. Arthroscopic transtibial pullout repair and deep MCL imbrication were performed. Rehabilitation was uneventful, and the patient returned to competitive baseball. This case highlights the importance of maintaining a high index of suspicion for PMMR tears in adolescents with deep flexion pain, as early diagnosis and repair may prevent premature osteoarthritis and optimize functional outcomes.

Keywords: Posterior medial meniscal root tear; Meniscal root repair; Skeletally immature athlete; Adolescent knee injury; Arthroscopic transtibial pullout repair