Concave-Convex Rules for LE- NPTE Review

What surfaces are concave and convex in the hip joint? How does this affect the arthrokinematics?

Convex femur moving on concave acetabulum; roll and slide in opposite directions

In hip flexion, name the direction of the roll and slide of the femur

roll anterior

slide posterior

T/F In hip flexion, the femur will roll anteriorly and slide posteriorly

TRUE

T/F In hip flexion, the femur will roll posteriorly and slide anteriorly

FALSE

T/F In hip flexion, the femur will roll and slide posteriorly

FALSE

Describe the arthrokinematics involved in hip extension

roll posterior

slide anterior

T/F In hip extension, the femur will roll posteriorly and slide anteriorly

TRUE

T/F In hip extension, the femur will roll anteriorly and slide posteriorly

FALSE

Describe the arthrokinematics of hip ABD

roll laterally

slide medially

Describe the arthrokinematics of hip ADD

roll medially

slide laterally

Describe the arthrokinematics of hip IR

roll anteriorly

slide posteriorly

Describe the arthrokinematics of hip ER

roll posteriorly

slide anteriorly

What surfaces in the tibiofemoral joint are convex and concave. How does this affect the arthrokinematics?

IF OPEN CHAIN: concave tibia moves on convex femur; roll and slide are the same

IF CLOSED CHAIN:

convex femur moves on concave tibia; roll and slide are opposite

Describe the arthrokinematics of open chain knee flexion

roll posterior

slide posterior

Describe the arthrokinematics of open chain knee extension

roll anterior

slide anterior

Describe the arthrokinematics of closed chain knee flexion

roll posterior

slide anterior

Describe the arthrokinematics of closed chain knee extension

roll anterior

slide posterior

T/F In OKC knee flexion, the tibia rolls posterior and slide posterior

TRUE

T/F In OKC knee flexion, the tibia rolls posteriorly and slides anteriorly

FALSE

T/F In OKC knee extension, the tibia rolls anteriorly and slides anteriorly

TRUE

T/F In OKC knee extension, the tibia rolls posteriorly and slides anteriorly

FALSE

T/F In OKC knee extension, the tibia rolls posteriorly and slides posteriorly

FALSE

T/F In CKC knee flexion, the femur rolls posteriorly and slides anteriorly

TRUE

T/F In CKC knee flexion, the femur rolls anteriorly and slides posteriorly

FALSE

T/F In CKC knee flexion, the femur rolls posteriorly and slides posteriorly

FALSE

T/F In CKC knee extension, the femur rolls anteriorly and slides posteriorly

TRUE

T/F In CKC knee extension, the femur rolls posteriorly and slides posteriorly

FALSE

T/F In CKC knee extension, the femur rolls anteriorly and slides anteriorly

FALSE

In what direction does the patella slide on the femur during knee flexion

inferior

In what direction does the patella slide on the femur during knee extension

superior

What surfaces are concave and convex in the talocrural joint? How does this affect the arthrokinematics?

convex talus moving on concave tib-fib; roll and slide are opposite

Describe the arthrokinematics at the talocrural joint during DF

roll anterior

slide posterior

Describe the arthrokinematics at the talocrural joint during PF

roll posterior

slide anterior

T/F During ankle DF, the talus rolls anteriorly and slides posteriorly

TRUE

T/F During ankle DF, the talus rolls posteriorly and slides anteriorly

FALSE

T/F During ankle PF, the talus rolls posteriorly and slides anteriorly

TRUE

T/F During ankle PF, the talus rolls anteriorly and slides posteriorly

FALSE

Describe the arthrokinematics at the subtalar joint during inversion

roll anterior

slide posterior

Describe the arthrokinematics at the subtalar joint during eversion

roll posterior

slide anterior

T/F During ankle eversion, the calcaneus rolls posteriorly and slides anteriorly

TRUE

T/F During ankle eversion, the calcaneus rolls anteriorly and slides posteriorly

FALSE

T/F During ankle inversion, the calcaneus rolls anteriorly and slides posteriorly

TRUE

T/F During ankle inversion, the calcaneus rolls posteriorly and slides anteriorly

FALSE