Post-traumatic meniscal ossicle due to avulsion fracture of medial meniscus was very rare. They were often associated with meniscal tear, but caused symptoms without a tear, by mass effect from protruding meniscal contour. so it had to be differential diagnosised with free loose body in the knee joint. We experienced a symptomatic meniscal ossicle due to post-traumatic avulsion fracture of the posterior horn of medial meniscus, and managed with open reduction, internal fixation with screw and washer after arthroscopic examination. We report a rare case of meniscal ossicle in detail with literature