Tibiofemoral 1
What is the arthrokinematic motion of the tibiofemoral joint during OKC motion?
In order to improve a patients knee extension, what kind of joint mobilization would you do? Show us!
anterior glide
What is the direction of the glide of the patella during knee flexion?
inferior glide
In full extension, what part of the patella is in contact with the femur?
Apex
During weight bearing flexion, what ligament is taut?
ACL
During weight bearing extension, what ligament is taut?
PCL
True or False: in knee flexion, there is decreased contact and stress of the patella.
False- there is increased contact and stress with flexion. there is decreased contact and stress with extension
When your knee is in flexion, does your patella sit more medially or laterally?
medial in knee flexion, lateral in full extension
The femur and tibia form a normal valgus angle of ______. If it is more than _______ it is genu valgum. If it is less than ______ it is genu varum.
180-185°, 185°, 175°
What is the pivot point for flexion/extension?
femoral epicondyle, the pivot point moves throughout the range
Is patella baja associated with more or less stability?
More stability. Patella baja (lower patella) results in a shorter patellar tendon, creating more stability but higher stresses on the joint
What is Q-angle measuring? Show us!
varus/valgus of the knee
What position of the knee will lead you to have the greatest IR/ER?
knee flexed to 90°
What is the normal value for total arc of motion for IR/ER?
50-70°
Name at least 3 factors that influence Q-angle
Name at least 3 factors that influence patellofemoral stability
patella alignment, genu recurvatum (hyperextension), laxity of MPFL, depth of lateral femoral condyle, patellar hypermobility, muscle contraction
Describe the screw home mechanism when going into open chain extension
In the last 5-10 degrees of knee extension, there will be tibial ER. This is because the medial articulation surface is longer
In weight bearing knee flexion, describe the motion of the femur and tibia
Femur ER, tibia IR
At what degree of knee flexion is there peak moment arm and torque of the patellofemoral joint?
45-60° of knee flexion
In seated knee extension, where is increased quad force required? in standing knee extension?
In seated knee extension, increased quad force is required near end range ext. In standing knee extension, increased quad force is required near end range flexion.