1201 25. Running Knee Injury (Articulation of the Knee Joint) Ellen is a recreat

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1201 25. Running Knee Injury (Articulation of the Knee Joint) Ellen is a recreational runner. She averages 20 to 30 miles per week and has been running for 20 years. She participates in occasional marathons but is mostly motivat- ed to run for cardiovascular, pulmonary, and muscular months, Ellen noticed a clicking sound in her right knee. She ignored the clicking and continued to run since she had no pain, loss of motion, or strength conditioning. For the past few One day as she was getting ready to run after a warm up stretch, Ellen felt a pop in her right knee. She could not bear weight on it, felt a sharp pain, and was unable to straighten her leg. She crawled into her house. Her husband drove her to the office of their friend David, an orthopedic surgeon. After examining Ellen, David ruled out a torn anterior cruciate ligament by doing the drawer test. He suspected a lar cartilage or meniscus. Ellen was torn articu- sent to a radiologist for an MRI of the knee. This test confirmed David's suspicions and an arthroscopic procedure was performed Several pieces of torn cartilage, "joint mice," were removed from Ellen's knee. was pleased to report that all of the ligaments were intact. After a recovery of four weeks, Ellen resumed her training regime. David 1. Describe the knee joint and the movements associated with this type of joint.

Explanation / Answer

Knee joint-

This joint is hinge type of synovial joint.

It mainly allows flexion and extension. And very small degree of medial and lateral rotation.

This joint made by articulation with patella, femur and tibia

There are 2 articulation present : tibiofemoral, patellofemoral

Tibiofemoral is main weight bearing joint of knee.

3 ligaments seen in knee joint they are:patellar ligament, collateral ligament(tibial collateral ligament,fibular collateral ligament) cruciate ligament(anterior and posterior)

Blood supply to genicular anastomosis around knee which is supplied by genicular branches of femoral and popliteal artery.

Movements:

1.flexion-produced by hamstring, gracilis, sartorius, popliteus

2.extension-produced by quadricep femoris, which inserts into tibial tuberosity

3.lateral rotation-produced by biceps femoris,

4.medial rotation-produced by semimembranous, semitendinous, sartorius, popliteus,garcilis

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