steplight 12 - LECTURE 14 Knee(Anatomy • Large synovial...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: LECTURE # 14: Knee (Anatomy) • Large synovial joint • Modified hinge joint due to size differences of femoral condyles (medial larger than lateral) • “screw-home” mechanism – unlocked by popliteus o Knee locked out in full extension o Most stable o Medial femoral condyle continues to role and slides posterior after lateral condyle has stopped Ligaments • ACL – Anterior Cruciate Ligament – injured by deceleration; work on hamstring after injury o Main stabilizer o 2 bundles twisted together o O: anterior, medial aspect of intercondular notch (shallower in females) of tibia o I: lateral femoral condyle o A: resist anterior displacement of tibia in relation to femur, hyperextension and internal rotation • PCL – Posterior Cruciate (cross) Ligament – injured by getting hit below knee or falling with plantarflexion o O: posterior tibia o I: medial femoral condyle o A: resist posterior displacement of tibia in relation to femur ACL and PCL are intracapsular…means you get effusion swelling. MCL and LCL are capsular…means you get edema swelling. • MCL – Medial Collateral Ligament (on the meniscus) o O: medial epicondyle of femur o I: medial tibial plateau (3 fingers below the joint line) o A: resist valgus stress; if you have severe valgus stress…can injure meniscus) • LCL – Lateral Collateral Ligament o O: lateral epicondyle of femur o I: fibular head o A: resist varus stress Meniscus • Fibrocartilage discs (lie on tibial condyles) • Medial is more C shaped, larger in diameter, and firmly attached to tibia (more commonly torn) • Lateral is more O shaped, thicker, and more mobile • Change shape through ROM • Will not heal itself • Functions: cushion, shock absorption, stability Patella (Anatomy) • Patella – increases the pull of the patellar tendon allowing for greater force production; sesamoid and intertendonous o Position maintained laterally by the retinaculum o Position maintained medially by VMO o Poor tracking occurs when there is an imbalance • Patella Positioning o Patella Alta – high riding patella o Patella Baja – low riding patella – more prone for patella tendonitis...
View Full Document

This note was uploaded on 04/05/2011 for the course PSYCH 4280 taught by Professor Staff during the Fall '09 term at Georgia State.

Page1 / 6

steplight 12 - LECTURE 14 Knee(Anatomy • Large synovial...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online