Joints, Ligaments & Muscles of Knee Flashcards
Patellofemoral joint open and closed pack
O: Full knee extension
C: Full knee flexion
Tibiofemoral joint open & closed pack
Open: 25 degrees
Closed: full extension and lateral rotation of tibia
Patella increases mechanical advantage of quads by:
Increases quads moment arm
> 5 degrees of knee hyperextension is known as
Genu recurvatum
Screw home mechanism open and closed chain description
Open: ER of tibia on femur at end range knee extension
Closed: IR of femoral surface on tibia at end range knee extension
Normal Q angle is _____ and formed by:
13 - 19 degrees
Measured by ASIS line to middle of patella and middle patella to tib tub
Is a condition in which the tib tub bc more pronounced at an older age
Osgoodslaughter
This ligament prevents tibia moving fwd and femur from moving bkwd
Anterior cruciate ligament
This ligament prevents tibia moving bkwd and femur moving fwd
posterior cruciate ligament
This knee ligament is more commonly injured
ACL more commonly injured, usually more commonly injured in females, usually noncontact injury - cutting, land flat on heels
This force stresses the MCL
Valgus
This force places stress on the LCL
Varus
LCL attaches to
lateral condyle of femur and fibular head
This meniscus is torn more frequently
Medial
How many bursae att knee
13
These three muscles attach to Pes Anserine
Sartorius, Gracilis, Semi-tendinosus
These two tendons are frequently used for autographs to repair ACL
Semitendinosus and Gracilis
N & NR Rectus Femoris
Femoral Nerve; L2, L3, L4
O, N & NR for Vastus Lateralis
O: Linea Aspera
N: Femoral Nerve
NR: L2, L3, L4
This muscle fires most at end range knee extension
Vastus Medialis
O, N & NR Vastus Medialis
O: Linear Aspera
N: Femoral Nerve
NR: L2, L3, L4
O, N, NR of Vastus Intermedialis
O: Anterior femur
N: Femoral nerve
NR: L2, L3, L4
I, N, NR of Semi-membranosus
I: Posterior surface of medial condyle of tibia
N: Sciatic Nerve
NR: L5, S1, S2
N & NR of Semitendinosus
N: Sciatic Nerve
NR: L5, S1, S2
O, N & NR of short head Biceps Femoris
O: Lateral lip of linea aspera
N: Common Peroneal Nerve
NR: L5, S1, S2, S3
N & NR of Biceps Femoris
N: Sciatic nerve
NR: L5, S1, S2, S3
This muscle unlocks the knee
Popliteus
The popliteus unlocks the knee how?
external rotation
N, NR of Popliteus
N: Tibial Nerve
NR: L4, L5, S1
O, I, A, of Popliteus
O: Lateral condyle of femur
I: Posterior medial condyle of tibia
A: initiates knee flexion
This muscle can help hold knee in extension if pt does not have quad function
Gastrocnemius
Muscle contributes to lateral stability
TFL
These two muscles contribute to medial stability
Gracilis & Sartorius
These two muscles provide posterior stability - both medially and laterally
Gastroc & Hamstrings
Provides anterior stability to knee
Quads
Knocking knees
Genu Valgum
Genu varum
bowleged
Terrible Triad
ACL, MCL, Medial Mensicus
Pronounced tib-tub
Osgood-Schlatter disease
Patellofemoral pain syndrome
happens in younger people; athletes: knee may give way unexpectedly: usually result of roughening, overuse,: felt when knee bent,
