Knee Flashcards
Characteristics of tibial-femoral articulation
-convex femur on concave tibia
-bicondylar joint
-synovial joint
Purpose and characteristics of meniscus
-purpose: cushion and promotes joint surface congruency
-intra articular
-poor blood supply
Which femoral condyle is longer? What does it cause?
Medial; causes normal valgus
Which femoral condyle is higher? What does it do?
Lateral; offsets lateral tracking of extensor mechanism
How much anteversion are you born w/? Adult range?
30-35 degrees; 10-15 degrees
What does excessive anteversion lead to?
-excessive IR
-in toeing
-lateral tracking concerns
What is osteokinamatics?
Physiologic motion; flex/ext, abd/add etc.
What is arthrokinematics?
Joint motion; roll, slide, glide etc.
What is the screw home mechanism?
-tibial ER w/ last 30 degrees of ext (think LAQ)
Lateral tracking
Quad muscles pull patella laterally. If VMO or medial muscles are strong and lateral quads aren’t, then patella will be pulled laterally
Joint play - glides and in regards to ant/post glide
-Translator if motion between two joint surfaces
-Anterior glide: ACL is primary restraint
-Posterior glide: PCL is primary restraint
Joint play - tilts
-valgus stress; primary restraint MCL
-varus stress; primary restraint LCL
Levels of stability
Bone, ligament, muscle
Pes ansirene (muscles)
-sartorius, gracillis, semitendonosis
-creates internal tibial rotation
Screw home mechanism - closed chain
IR of femur on tibia during extension
