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33 Cards in this Set
- Front
- Back
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what are the 2 joints of the knee complex?
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tibiofemoral joint
patellofemoral joint |
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what ligaments resist movement in the frontal plane? and what motion do they prevent?
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LCL and MCL
varus and valgus |
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what ligaments primarily resist translation?
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ACL and PCL
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tibia on femur motions are what kind of system?
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open chain system
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femur on tibia motions are what kind of system?
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closed chain system
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what kind of joint is the tibiofemoral joint? and how many degrees of freedom?
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double condyloid joint
2 degrees of freedom |
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what are the motions of the TFe joint?
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flex/ext = mediolateral axis thru femoral condyles
medial/lateral rotation = vertical axis through medial femoral condyle |
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arthrokinematics of TFe joint flexion in an open chain system?
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roll and slide posterior
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arthrokinematics of TFe joint extension in a closed chain system?
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roll and slide anterior
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what ligaments limit flexion?
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PCL
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what ligaments limit extension?
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ACL and 2ndary is MCL and LCL
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arthrokinematics of TFe joint during medial rotation?
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Tibia rotates medially
femur rotates laterally |
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arthrokinematics of TFe joint during lateral rotation?
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Tibia rotates laterally
femur rotates medially |
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what are the loose and close packed positions for the TFe joint?
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loose = ~25 flexion
close = full extension |
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how many degrees of freedom does the patellofemoral joint have?
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6 degrees
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there is minimal what in the PF joint?
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minimal joint congruency which does not allow us to follow the normal arthrokinematic guidelines
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what are the loose and close packed positions of the PF joint?
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loose = fully extended with minimal muscle contractions
close = ~25 flexion |
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what influences flexion and extension of the knee joints?
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knee position
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medial/lateral rotation is max when?
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~ 90 knee flexion
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what muscles are the knee flexors (medial rotators)?
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1. semimembranosus 2
2. semitendinosus 2 3. sartorius 2 4. gracilis 2 5. popliteus 1 |
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which muscles are the knee flexors?
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1. biceps femoris 3
2. biceps femoris (short) 2 3. gastrocnemius 2 |
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contraction of the knee flexors in a closed chain position will cause?
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femur to flex on tibia
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contraction of the knee flexors in an open chain position will cause
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knee flexion
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what phase of running can the tibia still move while femur remains relatively stationary?
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swing phase of running
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when turning what occurs involving the femur and tibia?
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femur externally rotates while tibia relatively stationary
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how could you increase hip flexion range of motion?
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flex the knee
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what muscles are the knee extensors?
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1. vasti lateralis, medialis and intermedius - 1
2. rectus femoris - 2 |
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contraction of the knee extensors will cause what in a closed chain system?
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femur to extend on tibia
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contraction of the knee extensors will cause what in an open chain system?
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tibia to extend on femur
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what is the optimal length of the vasti?
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~45 knee flexion
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rectus femoris length will affect?
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knee strength and flexibility
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RF is shortened by?
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hip flexion
knee extension |
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RF is lengthened by?
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hip extension
knee flexion |
