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Review of the Knee Joint Name the ligament Name the muscle and its action(s) Semitendinosus • Action: – Flexion of the knee – Internal rotation of the knee 1. Vastus Medialis 1. 2. Rectus Femoris 2. 3. Vastus Lateralis 3. Tibia & Fibula ? = Medial condyle ? = Lateral condyle ? = Head of fibula What tendons are part of the pes anserinus? • sartorius, • gracilis, • semitendonosus Name the muscle and its action Sartorius Action: Flexion at the knee Name the muscle and one action • Gastrocnemius • Flexion of the knee Posterior Name the muscle and its action(s) Semimembranosus • Action: – Flexion of the knee – Internal rotation of the knee 1. Anterior cruciate ligament 2. Lateral collateral ligament 3. Lateral meniscus 4. Posterior cruciate ligament 5. Medial collateral ligament 6. Medial meniscus 1. 4. 2. 5. 3. 6. Name the muscle and its action Popliteus • Action: – Flexion of knee – Internal rotation of the knee 1 = Lateral Meniscus 2 = Patella 3 = Medial meniscus 1. 3. 2. Name the colored muscles • Vastus medialis • Rectus femoris 2 1 • Vastus lateralis 3 Femur ?= ?= ?= Lateral condyle Medial condyle Intercondylar fossa Name the muscle and its action Gracilis Action - flexion at the knee 2. 1. 3. 1. = Vastus lateralis 2. = Rectus femoris 3. = Vastus medialis What is the Q angle? • The angle between the line of pull of the rectus femoris and the patellar ligament. Review • Define “screw home” movement. – Locking of the knee during full extension and external rotation. • Which type of rotation occurs during “unlocking” of the knee? – Internal rotation and flexion 1. 2. 3. 3. 4. 1. = Anterior cruciate ligament 2. = Lateral collateral 3. = Lateral meniscus 3. = Medial collateral 4. = Medial mieniscus Name the muscles. 1 = Vastus lateralis 1. 2 = Vastus intermedius 2. 3 = Vastus medialis 3. ? = Head ?= Lateral malleolus Fibula Name the muscles 1. Semitendonosis 2. Biceps femoris 3. Semimembrano sis 1. 2. 3. Name the muscle and its action Biceps femoris • Action: – Flexion of knee – External rotation of the knee Tibia ?= ?= ?= Medial condyle Lateral condyle Tibial tuberosicty Name two functions of the menisci. 1. Stabilization 1. Shock absorption 2. Lubrication Name the muscle and its action(s) Sartorius Action: Flexion at the knee Questions • What is a uniarticulate muscle? – A muscle that crosses one joint • What is a biarticulate muscle? – A muscle that crosses two joints. • What is a disadvantage of a biarticulate muscle? – They are weaker during movement at both of the joints. 1. 2. 1 = Lateral meniscus 2 = Medial meniscus Femur 1. Medial condyle 2. Lateral condyle 3. Intercondylar fossa Name the muscle and its action(s) Popliteus • Action: – Flexion of the knee – Internal rotation of the knee Tibia 1. 2. 1. 2. Lateral condyle Medial condyle Name the muscle and its action Biceps femoris Action: Flexion of knee External rotation of the knee Fibula Head Proximal Distal Head Name the muscles and its action 1. Vastus lateralis 1. 2. Vastus intermedius 3. Vastus medialis • Action: – Extension of the knee 2. 3. LIGAMENTS 1. 2. 3. 4. 5. 6. 1. 2. 3. 4. 5. ACL Lat. Collat. Lat. Men. PCL Med. Collat. 6. Med. Men. Meniscus 1 4 2 3 1. 2. 3. 4. ACL Lateral men. PCL Medial men. Name the muscle and its action Rectus femoris • Action: – Extension of knee Name the muscle and its action(s) Muscle: Sartorius Action: Flexion at the knee Name the muscle and its action(s) • Semimembranos\us • Action: • Flexion of the knee 1. Anterior cruciate ligament 2. Lateral collateral ligament 3. Lateral meniscus 4. Posterior cruciate ligament 2. 5. 5. Medial collateral ligament 3. 6. 6. Medial meniscus 1. 4. Name the muscle and its action(s) • Rectus femoris • Actions: • Extension of the knee 1 = PCL 2 = Lateral meniscus 3 = ACL 4 = Medial meniscus 1. 4. 2. 3 Name the colored muscles 2 = Vastus lateralis 1 = Rectus femoris 4 = Vastus medialis ?= ?= ?= Lateral condyle Medial condyle Intercondylar fossa Name the muscle and its action(s) Gracilis Action - flexion at the knee 1. Biceps femoris 2. Biceps femoris 3. Semitendonosis 4. Semimembranosis ? = Medial condyle ? = Lateral condyle ? = Medial Malleolus 2. 1. 3. 1. = Vastus lateralis 2. = Rectus femoris 3. = Vastus medialis Name the muscle and its action(s) • Semitendinosus • Action: • Flexion of the knee 1. = Anterior cruciate ligament 2. = Lateral collateral 3. = Lateral meniscus 3. = Medial collateral 4. = Medial mieniscus 1. 2. 3. 3. 4. Name the muscles. 1 = Vastus lateralis 2 = Vastus intermedius 3 = Vastus medialis 1. 2. 3. ?= ?= Head Lateral malleolus Name the muscle and its action(s) • Biceps femoris • Action: • Flexion of knee ?= ?= ?= Medial condyle Lateral condyle Medial Malleolus Name the muscle and its action(s) • Action: • Flexion of the knee 1 = Medial meniscus 2 = PCL 3 = ACL 4 = Lateral meniscus 3. 1. 4. 2. QUESTIONS?