The association between posterior-inferior tibial slope and anterior cruciate ligament insufficiency.

Purpose: The purpose of this study was to determine whether an increased posterior-inferior tibial slope (PITS) is associated with anterior cruciate ligament (ACL) rupture and whether an increased PITS results in worse pivot-shift grades in ACL-insufficient patients. This study also examined the difference in PITS between men and women.

Methods: We radiographically measured the PITS angle of 100 ACL-insufficient patients and 100 patients with patellofemoral pain (control patients).