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33 Cards in this Set

  • Front
  • Back
What ligaments restrict excessive lateral rotation of the tibia?
What ligaments restrict excessive medial rotation of the tibia?
Describe the arthrokinematics of knee flexion in an CKC.
The femoral condyles roll posteriorly and glide anteriorly
What nerve roots innervate the biceps femoris (long head)?
What nerve roots innervate the biceps femoris (short head)?
Describe the shapes of the tibial condyles.
The medial tibial plateau is concave, but the lateral is convex
How does the lateral facet on the lateral femoral condyle differ from the medial facet?
The lateral is higher thereby adding more stability as the patella tracks laterally during extension.
Does the lateral meniscus attach to the LCL?
Which meniscus is more firmly attached to the tibial plateau?
What part of the meniscus has a blood supply?
Lateral one third
What role do the menisci play?
Increase joint congruency, shock absorbance, they decrease friction
What are the ramifications of a genu valgum deformity?
MCL is stretched and the lateral meniscus is subjected to increase compression forces, increased lateral tracking of the patella
What kind of force causes the LCL to become taut?
What kind of translation does the ACL control?
Open kinetic chain-excessive anterior tibial Closed kinetic chain-excessive posterior of the femur
At what degree does tibial rotation occur?
90 degrees
Describe the normal sequence of contact forces that occur at the patella.
During knee flexion the contact forces progress from a superior to inferior direction.
Describe the screw home mechanism.
During knee extension in an open kinetic chain, the tibial rotates laterally
What three factors contribute to the screw home mechanism?
Shape of the MFC, Tension in the ACL, and lateral pull of the quads
What is the Q angle and how is measured?
The net lateral pull exerted on the patella by the quads. Axis-mid patella, proximal reference point- ASIS, distal reference point-tibial tuberosity
What is a low positioned patella called?
Patella baja
What is the closed position of the knee?
What path does the patella normally take when doing from full flexion to extension?
Lateral to medial to lateral
What is the role of the patella?
Increases the moment arm of the quads
What structures apply lateral directed forces on the patella?
IT band, Lateral patellar rectinaculum, quads
What mechanism would cause the PCL to tear?
Hyperflexion or dashboard injury
What six factors contribute to excessive lateral tracking of the patella?
Tight lateral structures, Excessive laxity in the medial structures, Bony dysplasia, abnormal patella position, knee malalignment, muscle weakness
What muscle is considered the "key" to the knee?
What happens to the compression forces across the PF joint with squatting?
They increase as the amount of squatting increases
What is hyperextension of knee called?
Genu recurvatum
What structure is taut with genu recurvatum?
Posterior capsule
How would you actively insufficient the hamstrings?
Ask the patient to actively extend the hip and flex the knee concurrently.

What is an Extensor lag?

The patient has full passive ROM but is unable to actively extend the knee from 30 to 0 degrees

How many degrees of motion can ocurr at the knee?
3 Flex/ext, Varus/Valgus and Rotation