L6 Knee Flashcards
Knee Anatomy
-hinge joint
-largest in the body
-patella slides superior during extension and inferior in flexion
-screw home mechanisms is necessary for stability
Capsular pattern of knee
Flexion > Extension
Open packed = 25° flexion
Closed packed = full extension
Intra-articular problems of knee
ACL/PCL
meniscus
chrondral surface of tibiofemoral and patellofemoral
Extra-articular problems of knee
contractile
non-contractile = lcl, mcl, MPFL
Referred problems of knee
L3
peripheral nerve
systemic
Younger children
more likely to be developmental, epiphyseal, fractureT
Teen to middle aged
more. likely to be soft tissue
Older adults
more likely to be degenerative or fracutre
Peak incidence of knee trauma is at age
15 to 19
Prevalence of Knee pain
25% of population will have significant episode of knee pain
400,000 ACL reconstructions a year
790,000 TKA a year
patellar dislocations is the least common
Most common injured ligament in isolation
ACL
ACL MOI
valgus force with foot firmly planted
axial rotation torque
severe hyperextension of knee
ACL History
usually non-contact
landed awkwardly
felt pop
immediate effusion
PCL MOI
fallin flexed knee w/ankle in PF
dashboard contact
severe hyperextension of knee
PCL History
often posterior pain
immediate effusion