Fig. 5.

Photographs and illustrations depicting provocative (L) and safe (R) landing position. These figures demonstrate the average joint angles at initial contact for athletes at risk of sustaining NC-ACLI and healthy controls. The average hip angles were obtained from the study by Sheehan et al.¹⁶. The average ankle and knee angles were obtained from the study by Boden et al.¹⁷. It should be noted that the images are still frames (not obtained from video) and were manipulated to place the athlete in the average provocative and safe positions. (Reprinted, with modification, from: Boden BP, Breit I, Sheehan FT. Tibiofemoral alignment: contributing factors to noncontact anterior cruciate ligament injury. J Bone Joint Surg Am. 2009 Oct;91[10]:2381-9.)