Poster 268: The Relation Between Posterior Tibial Slope Angle and Bilateral ACL Tear

Objectives: Increased posterior tibial slope (PTS) is a risk factor for primary anterior cruciate ligament (ACL) tear, as well subsequent ACL graft tear. Prior literature has shown conflicting relationships between an increased PTS and bilateral tears. The purpose of this study to compare angles patients who had tears those only sustained unilateral Methods: Retrospectively we identified at our institution over the last 10 years. Those surgery were matched on ratio 1:1 based age, sex, BMI. Patients with reconstruction excluded if they revisions or less than 5 years post-operative. Lateral knee radiographs used measure slope. axis was found using circles measurement method which consisted drawing along shaft placing line through center each estimate anatomical axis. then defined angle perpendicular plateau tangent line. Three blinded orthopedic residents performed these measurements. In addition comparison mean cohorts, both cohorts stratified into “high slope” “low 10-degress cutoff. An interclass correlation coefficient (ICC) calculated. Results: Fifty-three successfully 53 average in be significantly higher (11.17 vs. 9.72, p = 0.005). intraclass calculated 0.80 (95% confidence interval: 0.75 – 0.85). These by aforementioned sub-groups, finding that 69.8% cohort more 10-degrees PTS, while true 46.4% (p 0.006). Conclusions: results demonstrate have Clinicians should consider routinely assessing newly-presenting patient initial marked deviations from general population could predisposing contralateral Further prospective research necessary determine present radiographic are greater