© 2010 Delmar, Cengage Learning 1 © 2011 Delmar, Cengage Learning PowerPoint Presentation to Accompany

© 2010 Delmar, Cengage Learning 2 © 2011 Delmar, Cengage Learning The Knee

© 2010 Delmar, Cengage Learning 3 © 2011 Delmar, Cengage Learning Essential Question What is the basic structure of the knee joint? 3

© 2010 Delmar, Cengage Learning 4 © 2011 Delmar, Cengage Learning Objectives You should be able to: –Describe the functions of the knee –Describe the ligament structure of the knee –Explain the function of the patellofemoral joint –List and define various sports-related injuries of the knee 4

© 2010 Delmar, Cengage Learning 5 © 2011 Delmar, Cengage Learning The Knee One of the most complex joints in the body –Most movements and activities depend on it for support and mobility –There is risk of overuse and traumatic injury in both contact and noncontact sports 5

© 2010 Delmar, Cengage Learning 6 © 2011 Delmar, Cengage Learning 6

© 2010 Delmar, Cengage Learning 7 © 2011 Delmar, Cengage Learning The Knee (cont’d.) Two types of cartilage in the knee joint: –Articular cartilage –Menisci 7

© 2010 Delmar, Cengage Learning 8 © 2011 Delmar, Cengage Learning The Knee (cont’d.) 4 main Ligaments –Medial collateral ligament (MCL) –Lateral collateral ligament (LCL) –Anterior cruciate ligament (ACL) –Posterior cruciate ligament (PCL) 8

© 2010 Delmar, Cengage Learning 9 © 2011 Delmar, Cengage Learning The Knee (cont’d.) Patellofemoral joint –Allows knee flexion and extension to occur with a lesser amount of quadriceps force 9

© 2010 Delmar, Cengage Learning 10 © 2011 Delmar, Cengage Learning The knee is one of the most commonly injured joints in the body 10

© 2010 Delmar, Cengage Learning 11 © 2011 Delmar, Cengage Learning Common Knee Injuries Patellofemoral problems –Articulation of the patella with the femur Symptoms: aching pain in the front or behind the knee, knee is giving way, crepitus, patellofemoral joint pain, and mild swelling Treatment: correct suspected causes, shoe inserts, taping and bracing, and stretching 11

© 2010 Delmar, Cengage Learning 12 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Patellar tendonitis –Inflammation of the patellar tendon –Caused by high-force, repetitive strain Symptoms: anterior knee pain and local tenderness Treatment: activity modification, stretching, ice, bracing, and taping 12

© 2010 Delmar, Cengage Learning 13 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Fat pad syndrome –Infrapatellar fat pad is a region of fatty tissue that lies underneath the patellar tendon Symptoms: pain just below the patella, tenderness, and swelling Treatment: special strengthening exercises, taping, icing, and anti-inflammatory medications 13

© 2010 Delmar, Cengage Learning 14 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Medial collateral ligament (MCL) sprain –Caused by a blow to the outside of the knee or a high-energy twisting Symptoms: limited motion, swelling of the medial knee, tenderness, and pain Treatment: PRICE, protective wrap, a brace or crutches, rehabilitation 14

© 2010 Delmar, Cengage Learning 15 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Torn anterior cruciate ligament –Females are now more susceptible –Can occur from contact or noncontact causes Symptoms: hearing a “pop” followed by effusion, knee buckling, nausea Treatment: splinting, icing, and compressive wrapping, crutches, reconstructive surgery, rehabilitation 15

© 2010 Delmar, Cengage Learning 16 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Posterior cruciate ligament tear –Most occur during a fall on the flexed (bent) knee with the foot plantar flexed or hyperflexion (bending too far) of the knee Symptoms: positive “sag test” Treatment: PRICE, physical therapy and rehabilitation 16

© 2010 Delmar, Cengage Learning 17 © 2011 Delmar, Cengage Learning Common Knee Injuries (cont’d.) Meniscus tears –Occur when the knee is twisted suddenly and one or both menisci become trapped between the femur and tibia or ligaments in and around the knee are torn Symptoms: slow and mild knee swelling, pain, popping, locking, or giving way of the knee Treatment: compressive wrap, crutches, knee supports, activity modification, medications, and physical therapy 17