knee anatomy review Flashcards
what are the three joints of the knee region
tibiofemoral
patella-femoral
proximal tibiofibular
what is larger on the patella the medial or the lateral facet
the lateral facet
what kind of joint is the tibiofemoral joint
a bicondaylar synovial joint
what movement do we see at the tibiofemoral joint
flex/ext
ER/IR
what is a open pack position for the tibiofemoral joint
30 flex
what is the closed pack position for the tibfemoral joint
full ext
what is the capsular pattern for the knee
flex > ext
is some valgum at the knee normal
yes
0-15
with valgum is the knee going in or out
the knee is going in
with varum is the knee going in or out
out
bowed leg
open chain kinematics of the knee
same direction
tibia moving on the femur
extension kinematics - open
anterior roll
anterior glide
flexion kinematics - open
posterior roll
posterior glide
closed chain kinematics
opposite direction
when does the screw home mechanism occur
moving from flexion to ext
what is happening in the screw home mechanism
10-15 deg of lateral tibia rot in non-WB (ER)
10-15 of medial femoral rots in WB
what muscle unlocks the knee from full extention
popliteus
what kind of joint is the patella-femoral joint
modified plane joint
where does the patella sit
in the trochlear groove of the femur
what is the function of the patella femoral joint
to protect the front of the knee and to provide the mechanical advantage for the quad muscle
what direction does the patella glide with flexion
inf
with flexion the patella comes in more contact
what muslce stablizes the patella on all side
the quad tendon
what is the purpose of the meniscus
deepens the joint surface and increases the congruency and contact area
absorbs shock
distributes WB load
provides stability and lubrication
is the MCL attached the men
yes the medial men
terrible tirad
with a men tear what happens to the shock absorption
shock absrobtion decreases
what part of the men is vascularized
the outside, there is less blood supply as we go more medial
what makes up the hamstring
semitendinous, semi-membranous, and biceps femoris
what attaches the two men anterior
the transverse ligament
what direction does the men glide with flex
post
what direction does the men glide with ext
inf
where does the the joint capsule run from
the femoral condyles to the below the men
the cruciate ligaments joint capsule
in the fibrous joint capsule but not in the synovial capsule
what is the plica
synovial membrane that is folded over
often not a problem
patella tendon and the patella
helps to maintain the alignment of the patella
the medial collateral ligament blends with what
med men
what the MCL resist
valgus stress
lateral tib rot
medial femoral rot
is the LCL attached to any other structures
no
not to capsule or men
what does the LCL resist
varus stress
lateral tib rot
medial femoral rot
ACL attches where on the tib
anterior on the tib
