%0 Case Reports %T Intraoperative Identification and Mosaicplasty in a Case of Femur Subchondral Osteoid Osteoma. %A Patil VS %A Aggarwal R %A Gupta A %A Kumar S %A Nair V %J Cureus %V 15 %N 10 %D 2023 Oct %M 38021561 暂无%R 10.7759/cureus.47393 %X Osteoid osteomas (OOs) are non-malignant primary bone abnormalities marked by a central nidus surrounded by reactive sclerosis. They typically manifest as aggravated nocturnal pain that responds to non-steroidal anti-inflammatory drugs (NSAIDs). These growths are most frequently found within the intracortical bone and the diaphysis of elongated bones. Within the realm of uncommon conditions, intra-articular OOs (IAOOs) exhibit distinctive presentations, often leading to postponed or inaccurate diagnoses. We present a patient with OO at the distal femur, accessible through the knee joint, which was intraoperatively identified and localized using a needle pricking technique and treated by arthrotomy and mosaicplasty.