BACKGROUND: Recent investigations have described the structural and functional behavior of the @entity18564 ( @entity18564 ) of the knee through pull-apart and isolated sectioning studies. However, the secondary stabilizing role of the @entity18564 in the setting of a complete @entity1347 ( @entity1347 ) tear has not been fully defined for common simulated clinical examinations, such as the pivot-shift, anterior drawer, and internal rotation tests. HYPOTHESIS: Combined sectioning of the @entity18564 and @entity1347 would lead to increased internal rotation and increased axial plane translation during a pivot-shift test when compared with isolated sectioning of the @entity1347 . STUDY DESIGN: Controlled laboratory study. METHODS: Ten fresh-frozen @entity1 cadaveric knees were subjected to a simulated pivot-shift test with coupled 10-N  m valgus and 5-N  m internal rotation torques from 0   to 60   of knee flexion and a 5-N  m internal rotation torque and an 88-N anterior tibial load, both from 0   to 120   of knee flexion via a 6 degrees of freedom robotic system. Kinematic changes were measured and compared with the intact state for isolated sectioning of the @entity1347 and combined sectioning of the @entity1347 and @entity18564 . RESULTS: Combined sectioning of the @entity1347 and @entity18564 resulted in a significant increase in axial plane tibial translation during a simulated pivot shift at 0  , 15  , 30  , and 60   of knee flexion and a significant increase in internal rotation at 0  , 15  , 30  , 45  , 60  , 75  , 90  , 105  , and 120   when compared with the intact and @entity1347 states. Based on the model results, @entity18564 sectioning resulted in an additional 2.1 mm (95% CI, 1.4-2.9 mm; P < .001) of axial plane translation during the pivot shift when compared with @entity1347 -only sectioning, when pooling evidence over all flexion angles. Likewise, when subjected to IR torque, the @entity1347 + @entity18564 state resulted in an additional 3.2   of internal rotation (95% CI, 2.4  -4.1  ; P < .001) versus the intact state, and the additional sectioning of the @entity18564 increased internal rotation by 2.7   (95% CI, 1.8  -3.6  ; P < .001) versus the @entity1347 state. CONCLUSION: The results of this study confirm the @entity18564 as an important lateral knee structure that provides rotatory stability to the knee. Specifically, the @entity18564 was a significant secondary stabilizer throughout flexion during an applied internal rotation torque and simulated pivot-shift test in the context of an @entity1347 knee. CLINICAL RELEVANCE: Residual internal rotation and a positive pivot shift after @entity1347 reconstruction may be attributed to @entity130 . For these @entity1 , surgical treatment of an @entity18564 tear may be considered.

An In Vitro Robotic Assessment of the Anterolateral Ligament, Part 1: Secondary Role of the Anterolateral Ligament in the Setting of an XXXX .

@entity1 :: ('9606', 'Species') :: ['human', 'patients'] @entity1347 :: ('MESH:C537775', 'Disease') :: ['ACL', 'anterior cruciate ligament', 'ACL-deficient'] @entity130 :: ('MESH:D014947', 'Disease') :: ['ALL injury'] @entity18564 :: ('MESH:D056988', 'Disease') :: ['anterolateral ligament', 'ALL', 'ALL-deficient']
@entity130 :: (MESH:D014947,Disease) :: ['Anterior Cruciate Ligament Injury']
