Flashcards in Knee 3 Deck (30):
What shapes of the patella will make it less stable?
Too small or facet angle is too flat.
Will patella baja or alta make the patella less stable?
What rotation of the tibia will make the patella less stable?
What foot position will make the patella less stable?
What position of the knee will make the patella more stable? Why?
Flexed knee. Due to deeper groove and increased compression force.
What muscle if strong will make the patella more stable?
What will genu varum do to patellar stability?
What patellar shapes will increase patellar stability?
Normal, large lateral lip.
What will patella baja do to patellar stability?
Increase it but wil lead to increase wear and tear due to excessive compression.
What foot position will make the patella more stable?
Normal or under pronated.
What type of large force is placed on the patellofemoral joint?
Cartilage compression of the patellofemoral joint will increase with what knee position?
What will the comprssion forces be like on the patellofemoral joint with; walking, joggin, stair climbing (walking), Descending stairs (walking), 90 degree squat?
Walking- half of BW, jogging- 4 X BW, Stair climbing- 2.5 X BW, descending stairs- 3.5 X BW, 90 degree- 7.5 BW.
What will the compression forces on the patellofemoral joint be like with jumping?
10 X BW.
What are the compression forces on the patellofemoral joint like with full extension of the knee?
No compression force through this joint.
During flexion of the knee what direction will the patella travel?
It glides inferior and posterior in the patellar sulcus.
What part of the patella will contact the femur with; zero degrees of flexion, 20 degrees, 45 degrees, 90 degrees, 135 degrees?
zero- no direct contact, 20- distal or apex, 45- central, 90- proximal or base, 135- Lateral and medial part of patella.
How much will the extensor leverage of the patella increase with 90-120 degrees and 0-5 degrees flexion?
90-120- 13%. 0-5- 31%.
With a 5, 15, 30, 45, 75 degree squat how much of the body weight will the quadraceps be able to lift?
5- 30%. 15- 100%. 30- 200%. 45- 300%. 75- 500%.
Walking on a level surface produces _____ x BW on quadraceps tendon, jogging produces about ____ X BW on quadraceps tendon, and jumping produces about ____ X BW on Quadraceps tendon.
1, 5, more than 10.
What muscle would respond faster to tension and faster to stress the VMO or Vastus lateralus and why?
Tension- Vastus lateralus. Stress- VMO due to faster twitch.
What are the ligaments of the anterior compartment of the knee?
Medial and lateral retinaculum.
What will the medial and lateral retinaculum allow for with a quadraceps tendon injury?
Allow patient to still extend the knee.
What could cause a tear of the medial retincaulae of the knee?
Valgus sprains and patellar dislocations.
A medial retinacular tear would lead to what?
Lateral patellar instability.
What would a weak or stretched medial retinaculum or a tight lateral retinaculum cause?
Lateral patellar tracking.
Where will the ITB be located at and what compartment of the knee?
Lateral knee and is included in the anterior compartment.
What are the 2 parts to the ITB and where will it insert at?
Smaller patellar band, larger tibial band, and inserts on patella and Gerdy's tubercle.
What would happen with a tight ITB?
Rubs on the lateral epicondyle of the femur and pulls on the patella. Leading to lateral tracking dysfunction.