We examined the reliability of a 2D video measurement technique as an assessment tool for non-contact ACL injury
risk, particularly as it pertains to valgus knee motion during high risk sports movements. From the results, we conclude
the following.
(1) The 2D-Cam method provides reliable descriptions of frontal plane knee motion for movements in which joint centres can easily be identified.
(2) The 2D-Cam method provides similar potential to current 3D methods for the screening of ACL injury risk in elite
level male and female basketball players stemming from dynamic valgus during side step and side jump move-
ments.
(3) The 2D-Cam method may be useful for evaluating the effectiveness of training programmes aimed at reducing
dynamic knee valgus motions, particularly if large modifications in valgus are possible.