Introduction and Objectives: Currently ACL reconstruction is one of the most frequent procedures in Trauma and Orthopedic Surgery. The aim of our study is to analyze the epidemiology of this lesion in the workplace.

Materials and Methods: We retrospectively reviewed 268 cases of ACL reconstruction using autologous semitendinosus and rectus medialis muscles. All these surgeries were performed at Fremap Majadahonda during 2005–2006. We excluded patients with concomitant lesion of the PCL and revision surgeries of ACL plasties. We compared the findings of the preoperative MRI and findings during surgery with respect to existent meniscal and chondral lesions.

Results: We found that the median time elapsed between the occurrence of the lesion and surgery was 2.2 months and from the lesion to MRI was 1.7 months. On MRI we found 47% of meniscal lesions and 9.5% of chondral lesions, in comparison with 56% and 13% found during surgery.

Discussion and Conclusions: More than half our patients had meniscal lesions associated with their ACL tear. We found more meniscal and chondral lesions during surgery than in the preoperative images. We present a stratified statistical study of the differences seen.