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33 Cards in this Set

  • Front
  • Back
what are the 2 joints of the knee complex?
tibiofemoral joint
patellofemoral joint
what ligaments resist movement in the frontal plane? and what motion do they prevent?
LCL and MCL
varus and valgus
what ligaments primarily resist translation?
ACL and PCL
tibia on femur motions are what kind of system?
open chain system
femur on tibia motions are what kind of system?
closed chain system
what kind of joint is the tibiofemoral joint? and how many degrees of freedom?
double condyloid joint
2 degrees of freedom
what are the motions of the TFe joint?
flex/ext = mediolateral axis thru femoral condyles

medial/lateral rotation = vertical axis through medial femoral condyle
arthrokinematics of TFe joint flexion in an open chain system?
roll and slide posterior
arthrokinematics of TFe joint extension in a closed chain system?
roll and slide anterior
what ligaments limit flexion?
PCL
what ligaments limit extension?
ACL and 2ndary is MCL and LCL
arthrokinematics of TFe joint during medial rotation?
Tibia rotates medially
femur rotates laterally
arthrokinematics of TFe joint during lateral rotation?
Tibia rotates laterally
femur rotates medially
what are the loose and close packed positions for the TFe joint?
loose = ~25 flexion

close = full extension
how many degrees of freedom does the patellofemoral joint have?
6 degrees
there is minimal what in the PF joint?
minimal joint congruency which does not allow us to follow the normal arthrokinematic guidelines
what are the loose and close packed positions of the PF joint?
loose = fully extended with minimal muscle contractions

close = ~25 flexion
what influences flexion and extension of the knee joints?
knee position
medial/lateral rotation is max when?
~ 90 knee flexion
what muscles are the knee flexors (medial rotators)?
1. semimembranosus 2
2. semitendinosus 2
3. sartorius 2
4. gracilis 2
5. popliteus 1
which muscles are the knee flexors?
1. biceps femoris 3
2. biceps femoris (short) 2
3. gastrocnemius 2
contraction of the knee flexors in a closed chain position will cause?
femur to flex on tibia
contraction of the knee flexors in an open chain position will cause
knee flexion
what phase of running can the tibia still move while femur remains relatively stationary?
swing phase of running
when turning what occurs involving the femur and tibia?
femur externally rotates while tibia relatively stationary
how could you increase hip flexion range of motion?
flex the knee
what muscles are the knee extensors?
1. vasti lateralis, medialis and intermedius - 1
2. rectus femoris - 2
contraction of the knee extensors will cause what in a closed chain system?
femur to extend on tibia
contraction of the knee extensors will cause what in an open chain system?
tibia to extend on femur
what is the optimal length of the vasti?
~45 knee flexion
rectus femoris length will affect?
knee strength and flexibility
RF is shortened by?
hip flexion
knee extension
RF is lengthened by?
hip extension
knee flexion