Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Ortho - Knee
Knee biomechanics
| Question | Answer |
|---|---|
| What is the largest joint in the body? | knee |
| What is the most frequently injured joint in the body? | knee |
| What are the three joints of the knee joint? | tibial-femoral, patello-femoral, superior tib-fib |
| What kind of joint is the knee? | modified hinge joint |
| How many degrees of freedom does the knee have? | 2 |
| The primary motion of the knee is what? | flexion and extension |
| The knee has some rotation possible but only in what position? | knee flexion |
| What is the normal ROM for flexion extension? | 0-140 |
| Range of motion or internal and external rotation is influenced by the amount of knee _________. | Flexion |
| In full knee extension rotation is almost completely restricted due to what? | interlocking of femoral and tibial condyles |
| Rotation is at a maximum at __ degrees of knee flexion. | 90 |
| Normal external rotation ROM is? | 0-45 |
| Normal IR ROM is? | 0-30 |
| ___ prevents excessive internal rotation, guides the knee in flexion, resists posterior translation of the tibia on the femur | PCL |
| ___ stops excessive internal rotation, stabilizes the knee in full extension and prevents hyperextension | ACL |
| What is the purpose of the meniscus? | It deepens tibial plateau and lends stability to the knee |
| The meniscus Decreases friction by __% | 20 |
| The meniscus increases contact area by __% | 70 |
| Removing the meniscus can do what to the joint? | Increase wear on articulating surfaces, and increase chance of developing degenerative joint disease |
| Which menisci is C-shaped, thicker posteriorly, and has a firm attachment to the deep layers of the MCL? | medial meniscus |
| Which menisci is o-shaped, has uniform thickness, and a loose attachment to the lateral capsule? | lateral meniscus |
| What is the red-red zone of the meniscus? | Outer 1/3 of meniscus that has good potential to heal due to better blood supply |
| What is the red-white zone of the meniscus? | Middle 1/3 that may have healing potential but less blood supply that outer portion |
| What is the white-white zone of the meniscus? | Inner 1/3 that has no blood supply and won’t heal |
| The MCL prevent what motion and what stress? | motion=abduction & ER, stress=valgus |
| The LCL prevents what motion and what stress? | motion=adduction, stress=varus |
| The MCL assists in _____ translation of the tibia. | anterior |
| What is the origin of the ACL? | posteromedial aspect of lateral femoral condyle |
| What is the insertion of the ACL | anterior intercondylar eminence of the tibia |
| The ACL works to prevent ______ translation of the tibia on the femur and also stabilizes against _____ stress as well. | anterior, valgus |
| What becomes more active in stabilizing the knee when there is an ACL deficiency? | the hamstrings |
| The anteromedial bundle of the ACL functions with the knee in a _____ position. | flexed |
| The posterolateral bundle functions with the knee in ________ position | extended |
| From __ to __ degrees of motion the ACL is under the most stress. | 30-0 |
| From __ to __ degrees the ACL is under the least amount of stress. | 110-50 |
| The ___ is one of the strongest ligaments in the body. | PCL |
| The PCL prevents ________ translation of the tibia on the femur. | posterior |
| Is the PCL often injured in athletics? What is the most common MOI of the PCL? | no, hitting dashboard in MVA |
| What exercises might a physical therapist want to avoid while treating a patient with a PCL injury? | hamstring exercises as they can posteriorly translate the tibia on the femur |
| How do you measure the q-angle? | make a line from the ASIS to the middle of the patella, make another line from the middle of the patella to the tibial tuberosity and measure the angle between the two lines. |
| What the typical q-angle for a male? A female? | 10-14 degrees, 15-17 degrees |
| The greatest compressive force at PF joint will be at approximately __ degrees. | 90 |
| As the Q-angle increases, the resultant “sideways” vector will ________. | increase |
| What is PLICA? | Synovial thickening present in ~ 50% population |
| People with this syndrome typically have pain medially and it may be caused by overuse or trauma. | PLICA syndrome |
Created by:
txst sum 2009
Popular Physical Therapy sets