ACL Flashcards
The ACL passes from the anterior medial side of the tibial plateau and passes _______, ______ and _______ to the posterior notch of the femur
upward, backward, laterally
ACL resists ______ translation of the tibia on the femur
anterior
The ACL resists ______ of the femur on the tibia
rotation
ACL acts in conjunction with ______ ligaments to resist valgus forces
collateral
ACL assists with _____ -_____ mechanism
screw-home
Do ACL injuries occur more in contact or non contact situations ?
non-contact (70%)
What ROM do most ACL injuries take place in ?
0-30 degrees
4 MOI’s for ACL?
- planted food + rapid direction change (PIVOT)
- excessive anterior tibial translation
- hyper flexion or hyperextension
- direct trauma to the knee
What are 2 intrinsic factors that lead to higher incidence of ACL injuries in females?
- anatomic
2. hormonal
What are 3 anatomic factors that may lead to a higher incidence of ACL injuries in females?
- limb posture
- joint laxity
- size of intracondylar notch
What are 4 extrinsic factors that lead to higher incidence of ACL injuries in females?
- leg dominance
- ligament dominance
- quads dominance
- trunk dominance
When there is a _____ collapse, supporting muscles do not adequately absorb GRF and more forces are imparted through _______ restraints
valgus; static
____-____ landing posture, rather than flexed, = more risk for ACL tear
stiff-legged
Impaired core proprioception predicted knee injury in female, but not male athletes (T/F).
TRUE
4 factors in pt’s history that indicate an ACL injury?
- pain that is poorly localized 2. unable to continue to play on
- swelling (if it comes on within a few hours, most likely torn blood vessels in ACL)
- complaints of instability
4 special tests in examination for ACL tear?
- anterior drawer
- lachman
- lever sing or lelli’s test
- pivot shift