Ortho II: Knee (PFPS) Flashcards
What is the typical long term outcome for people with PFPS?
Most have continued pain or experience pain again
What are the facets of the patella covered with?
3-5 mm of aneural hyaline cartilage
What is in contact at the PFJ at 0 degrees knee flexion?
No contact
What is in contact at the PFJ at 15-20 degrees knee flexion?
Inferior pole
What is in contact at the PFJ at 45 degrees knee flexion?
Middle pole
What is in contact at the PFJ at 90 degree knee flexion?
All facets
What is in contact at the PFJ at full knee flexion?
Odd facet and lateral aspect of patella
What two factors lead to increased PFJRF?
Decreased articulation
Increased lateral vector
What two factors increase the magnitude of force of the quad?
Increase contraction
Increased knee flexion
When is the EMG ratio between the VMO and VL 1:1?
From 0-30 degrees knee flexion
When is the WMO least active?
at 0 degrees knee flexion
How does Q-angle increase risk of PFPS?
No effect
What motions at the hip are typically altered in individuals with PFPS?
-4 things
Increased hip adduction
Altered hip internal rotation
Reduced hip extension moments
Contralateral pelvic drop
What muscle changes are often seen in individuals with PFPS?
-2 things
Delayed and shorter activation of Glute Med
Altered quad activation
What motions are common in the foot and tibia in individuals with PFPS?
-2 things
Greater rearfoot eversion
Greater tibial IR
How does exercise affect PFPS?
Exercise improves pain in short medium and long term and improves function in medium and long term
What exercises should be prescribed to individuals with PFPS?
Hip and knee exercises
How do foot orthoses affect PFPS?
Reduce pain in short term
How do joint mobilizations affect PFPS?
Not recommended
How do modalities affect PFPS?
Not recommended
What are the potential pain generators in PFPS?
Subchondral bone
Med/Lat retinaculum
Synovium
Patellar ligaments
Infrapatellar fat pad
Elevated H2O in bone
What history is typically associated with PFPS?
Chronic idiopathic
Young, physically active
Females
Pain with squatting/jumping
