Chapter 120 - Anatomy and Biomechanics of the Knee Flashcards
what is the blood supply to the cruciate ligament?
middle geniculate artery
ACL is composed of what types of collagen?
90% type I
10% type III
Identify the anteromedial and posterolateral bundles of the ACL in the below photo
red = anteromedial
yellow = posterolateral
named after where they go on the tibia
Laprades medial side of the knee bony landmarks
Laprade’s medial side of the knee ligamentous/tendinous structures
posteromedial corner
Posterior oblique ligament
isertions of the semimembranosis
oblique popliteal ligament
posterior horn of the medial meniscus
Laprade’s lateral side of the knee bony anatomy
Laprade;s lateral side of the knee ligamentous/tendinous structures
medial meniscus characteristics
c-shaped
coverd 50% of medial plateau
firmly attached to medial joint capsule thru coronary and meniscotibial ligaments
lateral meniscus characteristics
o-shaped
covers 75 of lateral meniscus
anterior and posterior horns are close to one another and close to the ACL fibers
loosely attached to the capsule via popliteomeniscal fasicle, coronary ligaments, and meniscotibial ligaments
distal femur is in how much valgus compared to the anatomic axis?
6degrees
Dial test for Posterolateral corner vs PCL
positive dial test at 30 degrees - posterolateral corner
positive dial test at 30 and 90 degrees, posterolteral corner AND PCL
with knee flexion, what happens to the tibial point of contact?
most posteriorly and internally rotates
(conversely it moves anteriorly and externally rotates when extending)
what type of medial meniscus tears accompany chronic acl tears
degenerative root/posterior horn tears - the medial meniscus serves as the primary restraint to anterior translation of the tibia in acl deficient knees
blood supply to the menisci
medial and lateral geniculate aa
