This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The multi-center orthopaedic outcomes network (MOON) group has prospectively collected comprehensive preoperative and intra-operative data on over 2,000 anterior cruciate ligament (ACL) reconstructions at eight medical institutions over the past two years. The purpose of this study is to assess the variability of ACL tunnel aperture location and ACL tunnel placement amongst experienced knee surgeons in the MOON group performing primary ACL reconstructions. Graft tunnel placment will first be evaluated in a group of 20 randomly selected patients who have undergone an ACL reconstruction procedure by one of the two Orthopaedic surgeons in this study at the University of Iowa within the last six months, and are part of the MOON registry. This will serve as a pilot study prior to a future multi-institutional study. Three standard view x-rays and a CT scan (Computed Axial Tomography) of the ACL reconstructed knee will be obtained and evaluated to determine tunnel placement. Tunnel placement will be documented and compared to randomly selected patients at other participating sites. The main hypothesis is that minimal tunnel aperture location variability will be demonstrated amongst experienced knee surgeons performing ACL reconstructions despite differences in surgical techniques and graft
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