Written Flashcards
What is knee extension rom actively?
0
What is the knee extension prom?
5-10
What is knee flexion rom?
130-140
What is knee internal rotation rom?
0-30
What is knee external rom?
0-40
When is knee rotation the greatest?
90 flexion
What are the femoral condyles separated by?
Intercondlyar fossa posteriorly
What do the femoral condlye bend to for?
Concave trochlear groove
What plane has the greatest surface area for the femoral condlyes?
Sagittal plane
Which femoral condlye lip is longer?
Lateral condlye
Which femoral condlye is larger and longer?
Medial
What is the tibial plateau in the frontal plane?
Concave
What is the medial femoral condlye in the sagittal plane?
Concave
What is the lateral femoral condlye in the sagittal plane?
Convex
Why is the femoral condlye axis oblique?
Femoral condlyes are larger than tibial plateaus
Medial condlye is larger than lateral condlye
What is the medial tibiofemoral angle?
Femoral head hangs over femoral shaft
Femoral shaft doesn’t coincide with the leg
Creates an obtuse angle
What is normal for middle tibiofemoral angle?
185-190
Physiologic valgus
What is an increased medial tibiofemoral angle?
Greater than 195
What is genu valgum?
Knock knee
Coxa vara of knee
What is lower than normal medial tibiofemoral angle?
Less than 180
What is genu varum?
Bow legged
Coxa valga
What is the q angle?
Line from Asis to midline intersecting with mid patella
What is a normal q angle?
15
Open chain knee flexion arthrokinematics?
Concave tibia on convex femur
First 25 minimal movement
After posterior bone motion roll and glide
Open kinetic knee extension arthokinematics?
Concave tibia on convex femur
Anterior
Close chain arthokinematics for knee flexion?
Sit to stand
Bone motion roll posterior glide anterior
25 minimal gliding
What is the arthrokinematics for closed kinetic chain knee extension?
Sit to stand
Bone motion roll anterior glide is posterior
What is the screw home mechanism closed kinetic chain?
Internal rotation of femur on tibia
What is the screw home mechanism open kinetic chain?
External rotation of tibia on femur
When does the 20 of rotation occur in the screw home mechanism?
During the last 30 of extension
In the open kinetic chain the medial plateau is bigger so it moves_______ causing __________ rotation.
Anterior, external rotation
In the closed kinetic chain the medial femoral condlye moves ________ causing ___________ rotation.
Posterior,internal rotation.
Unlocking the knee from full extension starts with?
Log posterior to knee
Popliteaus muslce
In closed kinetic chain unlocking cause?
External rotation of femur
In open kinetic chain unlocking knee causes?
Internal rotation of femur
Limits knee extension
Varus and valgus stress
Anterior posteior transition of tibia on femur
Medial and lateral rotation of tibia on femur
General ligament function
This ligament attaches to the joint capsule and medial meniscus
Tight in knee extension
Resist valgus stress
Lateral rotation of tibia
Medial femoral condlye slope ant to medio prox tib
Mcl
No joint or menisci attachment
Tight in knee extension
Resist varus stress
Medial rotation of tibia
Lcl
Postlat- tight knee extension
Antmed- tight knee flexion
Extra synovial
Resist ant transition, prevent hyperextension
Limit internal rot of tibia
Ant tib to med and lateral menisci to post lat prox knee
ACL
Postlat tight in extension Antmed tight in flexion Extra synovial Resist post displacement of tibia Post tib to sup and ant inner knee
PCL
Acruate ligament y shaped
Tight in full knee extension
Prevent hyperextension
Run post to med tibial plAteau
Posterior capsular ligament
Lax and allow great amount of motion
Vertical fibers that Attach above margins of femoral condlye
Joint capsule
Affects patellar tracking
Cylinder invaginated post
Innervated by mechano receptors
Extensor retinaculae
Synovial fluid that is not re absorbed when an adult?
Police
Biconcave fibrocartilagious tissue between femur and tibia
Menisci
Medial menisci is_____ compared to lateral menisci
Wider
Menisci attaches to tibia by
Coronal lig
Menisci attach to patella by
Patellamensici lig
Attach to
Pcl
Popliteaus
Medial femoral condlye
Lateral menisci
Attach to
Mcl
Semimembranous
Medial menisci
Increase stability by increasing
Congruency
Concavity of plateaus
Surface area
Menisci increased stability by