Knee RMSK Flashcards
Two anterior bursae that don’t communicate with knee joint
Pes anserine and semimembarnosus tibial collateral ligament. bursa
ACL and PCL location
within intercondylar notch from femur to proximal tibia (intraccapsular) extra synovial
quadriceps fibers extending over patella are called
prepatellar quadriceps continuation
reinforcement of medial patellar retinaculum
medial patellofemoral ligament ( medial tibia to adductor tubercle)
Biceps femoris long head 2 parts
direct arm and anterior arm
Insertion of Biceps femoris long head
direct arm- lateral fibula with LCL
anterior arm- anterior to fibula
BIceps femoris short head 2 parts
direct arm and anterior arm-
Insertion of biceps femoris short heads
direct arm- proximal fibula medial to long head .. anterior arm- inserts to proximal tibia
Normal thickness of PCL
less than 1 cm. Abnormal if greater
Criteria for MCL ligament injury
> 6mm thick at femoral, >3.6mm at tibial attachment
appearance of grade 1 sprain of MCL
intact fibers, <5mm widening
criteria for repair of posterolateral corner
lateral joint space >10.5mm
when ACL is injured also look for what structure?
anterolateral ligament and check for AVULsion fracture of tibia (Segond Fracture)
LCL insertion
with biceps femoris at lateral fibula
Other causes of synovial hypertrophy
inflammation, chronic infection, RA, seronegative arthritis, crystal deposition, particle disease
Localized nodular synovitis
hypoechoic, non-compressible with possible increased through transmission
Most common site of tears for medial meniscus?
posterior horn
Characteristics of parameniscal cysts
multilocular and non-compressible, at jointline at base of meniscus
COmmon location of gout in the knee
popliteus, patellar tendon
extrusion of anterior horn of lateral meniscus
can be normal variant
What is a Pelligrini-Stieda lesion?
calcification/ossification at proximal part of MCL
Signs of of posterolateral injury
LCL tear, abnormal widening of lateral joint space of >10.5mm
Indirect sign of ACL tear
dynamic stress view - Identify abnormal anterior tibial translation
What causes baker cyst at 50 yrs old
degenerative weakening of intervening capsule and increased intra-articular pressure and joint fluid
Hypoechoic or anechoic fluid outside baker cyst indicates?
rupture
