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A. WILLIAMS
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It was a surprise, however, that the ACL was
only important in resisting internal rotation
close to extension. For the rest of the range of
knee motion tested, the ITB with its femoral
attachments was the primary restraint to
internal rotation and a simulated pivot shift by
some way, whereas the ALL and capsule
contributed only little.
Fig. 4:
Contribution of tested structures in restraining a 5-N·m internal rotation torque at 0°, 30°, 60°, and
90° of flexion. There is only 1 result each for the medial collateral ligament (MCL) and the posteromedial
corner (PMC) because they were only tested at 30° of flexion on 4 knees. Crosshatched areas indicate
results from the ACL-deficient group. Shown as mean + SD; n=8 (apart from the MCL and PMC: n=4).
Statistically significant change from the initial knee state (bracket indicates significant difference between
ACL intact vs deficient): *
P
<.05, **
P
<.01, and ***
P
<.001.
ACL
, anterior cruciate ligament;
ALL
, anterolateral
ligament;
Cap
, anterolateral capsule;
dcITT
, deep and capsulo-osseous layer of the iliotibial tract;
sITT
,
superficial layer of the iliotibial tract.
(Courtesy of Am J of Sports Med)
.