Lecture Quiz 9

Knee complex

comprised of the tibiofemoral and patellofemoral joints

Femoral condyles and tibial plateau

landmarks that form the tibiofemoral joint

Patellar surface and medial & lateral patellar facets

landmarks that form the patellofemoral joint

MCL, LCL, ACL, PCL, patellar, menisci

ligaments and structures of the knee complex

Patellar excursion

movement wherein the patella slides up and down the surface of the femur as the knee bends and straightens, up to 7cm total

Quads more efficient

function of the patella; makes the ___, longer arm

Lateral

the ___ condyles are more round

Medial

the ___ condyles are more “C” shaped

Femur in knee extension medially rotates on tibia

FEMR

Locking mechanism

created in the last 20 degrees of knee extension

Unlocking mechanism

created in the first 20 degrees of knee flexion

First, last

knee rotation occurs in the ___ 20 degrees of knee flexion and ___ 20 degrees of knee extension

Femur

in weight-bearing movements, the ___ is the more moveable bone

Tibia

in non weight-bearing movements, the ___ is the more moveable bone

Medial/lateral patellar retinaculum, medial/lateral patellofemoral ligaments

structural anatomy that supports the patella

Q angle

angle that measures the deviation of quad LOP compared to their continuation to the patellar tendon

Step 1

draw a line between ASIS and middle of patella

Step 2

draw a line between the tibial tuberosity and middle of patella (extend line superiorly)

10-18 degrees

normal q-angle

Gastrocnemius and plantaris

muscles that function at the ankle but assist in knee flexion

Ligaments

primary stability factor in the knee

FEMR

weight-bearing knee extension

TELR

non weight-bearing knee extension

FFLR

weight-bearing knee flexion

TFMR

non weight-bearing knee flexion

Vastus medialis

functions to prevent lateral displacement of the patella

Vastus lateralis

functions to pull the patella up and lateral in knee extension