Decreased Quadriceps Activation Measured Hours Prior to a Noncontact Anterior Cruciate Ligament Tear

Anterior cruciate ligament injury alters preinjury lower extremity biomechanics in the injured and uninjured leg: the JUMP-ACL study

“…These results have important clinical implications, as this investigation provides the first evidence—other than case reports16 17—to describe how ACL injury and ACLR may increase the risk for recurrent ACL injury via increased medial displacement of the hip and knee 15 23. The altered movement patterns were consistent across our injured population despite not controlling for injury mechanism, graft type or rehabilitation protocol.…”

“…There is, however, no substantial evidence to demonstrate that ACL injury and ACLR induce these deleterious changes, as previous reports of biomechanical measures collected prior to and following ACL injury have been limited to case reports 16 17. Therefore, it is presently unknown if altered biomechanics following ACL injury and ACLR are the result of the injury and surgery, or if these alterations were present prior to injury and may have contributed to the initial injury.…”

Biomechanical Deficiencies in Women with Semitendinosus‐Gracilis Anterior Cruciate Ligament Reconstruction During Drop Jumps

“…In order to ensure a maximal effort upward jump, participants were instructed to try to touch the ceiling of the laboratory [24]. Each participant performed five trials of this task, and was required to rest at least 30 seconds between trials in order to avoid fatigue [8]. …”

Longitudinal Gait and Strength Changes Prior to and Following an Anterior Cruciate Ligament Rupture and Surgical Reconstruction: A Case Report

“…15 Increased knee abduction angles and moments during jump-landing tasks were found in women who later sustained an ACL rupture, compared to women who remained uninjured. 17,28 Increased trunk displacement after a sudden force release has been associated with ACL injury in female athletes.…”