title: Can MRI predict the clinical instability and loss of the screw home phenomenon following ACL tear?
abstract: Our purpose was to determine the relationship between tibiofemoral translation on magnetic resonance imaging and clinical instability of the knee following anterior cruciate ligament (ACL) injury. Within 66 patients (43 males, 23 females, mean age 30.25 years), 15 of 19 patients (80%) with an intact ACL had a demonstrable normal screw home movement, while 24 of 47 patients (51%) with an ACL tear had absence of the screw home movement. Patients with clinical instability had greater tibial translation and excursion at the lateral compartment (P=.0001). Following ACL injury, there is demonstrable absence of the normal screw-home movement with anterior tibial translation and excursion related to presence of clinical instability.
authors.affiliation: Department of Imaging and Interventional Radiology, Prince of Wales Hospital, Chinese University of Hong Kong, Hong Kong. alex@sunghim.com
authors.forename: Alex Wing Hung
authors.initials: AW
authors.lastname: Ng
authors.forename: James Francis
authors.initials: JF
authors.lastname: Griffith
authors.forename: Esther Hiu Yee
authors.initials: EH
authors.lastname: Hung
authors.forename: Kan Yip
authors.initials: KY
authors.lastname: Law
authors.forename: Eric Po Yan
authors.initials: EP
authors.lastname: Ho
authors.forename: Patrick Shu Hang
authors.initials: PS
authors.lastname: Yung
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000473:pathology*; D000070598:Anterior Cruciate Ligament Injuries; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology* / Q000473:pathology*; D007718:Knee Injuries / Q000150:complications* / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055815:Young Adult