Knee Anatomy & Biomechanics Flashcards
T/F: the knee is one of the most injured joints in the body
T
what are the 3 categories of knee injuries?
sprain, strains, tendinopathies
contusions
meniscal or ligamentous
which femoral condyle is longer? what does this cause?
medial
valgus (slight)
which tibial plateau is smaller and more mobile?
lateral
the patello-femoral joint is dependent on BOTH ______ and ____ restraints for function and stability
dynamic and static
the patella is embedded in the ____ tendon
quad
which meniscus is more tightly bound and C shaped?
medial
which meniscus is O shaped and more mobile?
lateral
purpose of menisci?
stability
shock absorption
lubrication
what portion of the menisci are innervation and have blood supply?
outer 1/3
anterior and posterior horns
which ligaments are inside the capsule and which are outside?
inside - ACL & PCL
outside - MCL & LCL
which ACL bundle is taut in flexion? extension?
flexion - anteromedial
extension - posterolateral
what are the main motions checked by the ACL?
anterior tibial translation
posterior femoral translation
TIBIAL IR (valgus moment)
most of the PCL is taut in _____
flexion
what are the main motions checked by the PCL?
posterior tibial translation
anterior femoral translation
TIBIAL IR
secondary for varus/valgus forces
if the PCL is injured, pt will lose motion!!! about _____ deg
15
T/F: the MCL has good blood supply
T
which position isolates the MCL?
25-30 deg knee flexion
what motions does the MCL resist?
valgus stress
tibial ER
anterior tibial translation
which mm does the LCL blend with?
biceps femoris
what motions does the LCL check?
varus stress, esp. at 35 deg flexion
tibial ER
what is in the posterior acuate complex/posterior corner?
arcuate ligament
LCL
popliteus tendon
which bursa of the knee has a fat pad that can restrict motion when swollen?
infrapatellar
what is a plica?
loose synovial fold from fetal development
