Knee ligamentous issues Flashcards
Which are considered stronger, the cruciate ligaments or the collateral ligaments?
- cruciate
Are the cruciate ligaments intra/extra capsular and/or synivoal?
- they are intracapsular and extra-synovial
What structures is the MCL connected to?
- medial meniscus and the joint capsule
T or F;
The MCL has a poor blood supply, healing slowly.
- F
Has a rich blood supply, healing relatively well
The LCL connects to which structure?
- joins with the biceps femoris muscle to form a conjoined tendon, attaching into the proximal fibular head
Which ligament is the most commonly injured?
- ACL
The ACL becomes taut during ____ and is responsible for the which accessory motion?
- taut during flexion
- responsible for the glide after the knee rolls
The anteromedial bundle (AMB) of the ACL prevents _______ translation in ______, and the posteromedial bundle of the ACL prevents _______ translation in ________
o Anteromedial band (AMB) prevents anterior translation in flexion
o Posteromedial band (PMB) prevents posterior translation in extension
Which ligament resists hyperextension of the knee?
- ACL
The ACL acts as a secondary restraint against which motions?
- varus and valgus
ACL is more likely a ______ injury, compared to teh PCL which is more likely a _______ injury
- ACL more likely non-contact
- PCL more likely contact
The PCL becomes taut during ______ and is responsible for which accessory motion?
- becomes taut in extension; as femoral condyles roll forward, becomes taut and then causes a glide
MCL primarily restricts which motion(s)?
- valgus and lateral rotation
The MCL is most taut in which position?
- full extension
In full extension, the MCL accounts for ___% of the restraining force against valgus. At 25* of flexion, the MCL accounts for ____% of the restraining force agianst valgus.
- 57%
- 78%
What is a weird paradox about the MCL?
- the MCL is most taut in full extension, however is more responsible for stabilizing valgus load in slight flexion. May be taking on greater loading when slightly lax.
LCL primarily restricts which motion(s)?
- varus
- also limits external and internal rotation
The greatest strain on the LCL occurs in which position and with which force?
- full extension with tibial external rotation
What ligament helps limit anterior and internal rotation forces in an ACL deficient knee?
- LCL
Which ligament is the least often injured?
- LCL
T or F:
The knee is the most commonly injured joint
- T
Which ligaments are most often injured?
- ACL has highest rate, followed by MCL
Ligamentous injury is more likely in what demographic?
- younger female athletes (14-18 yo)
- more often in athletics in general
Some studies have shown as high as a ___:___ ratio for ______ (gender) for ligamentous knee injury
10:1, female to male ratio