© 2010 Delmar, Cengage Learning 1 © 2011 Delmar, Cengage Learning The Knee

© 2010 Delmar, Cengage Learning 2 © 2011 Delmar, Cengage Learning Objectives Upon completion of this chapter, 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 2

© 2010 Delmar, Cengage Learning 3 © 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 3

© 2010 Delmar, Cengage Learning 4 © 2011 Delmar, Cengage Learning The Knee (cont’d.) Two types of cartilage in the knee joint: –Articular cartilage –Menisci 4

© 2010 Delmar, Cengage Learning 5 © 2011 Delmar, Cengage Learning The Knee (cont’d.) Ligaments –Medial collateral ligament (MCL) –Lateral collateral ligament (LCL) –Anterior cruciate ligament (ACL) –Posterior cruciate ligament (PCL) 5

© 2010 Delmar, Cengage Learning 6 © 2011 Delmar, Cengage Learning The Knee (cont’d.) Patellofemoral joint –Allows knee flexion and extension to occur with a lesser amount of quadriceps force 6

© 2010 Delmar, Cengage Learning 7 © 2011 Delmar, Cengage Learning Knee Injuries Patellofemoral problems –Articulation of the patella with the femur Symptoms: Treatment: 7

© 2010 Delmar, Cengage Learning 8 © 2011 Delmar, Cengage Learning 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 8

© 2010 Delmar, Cengage Learning 9 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Fat pad syndrome –Infrapatellar fat pad is a region of fatty tissue that lies underneath the patellar tendon Symptoms: Treatment: 9

© 2010 Delmar, Cengage Learning 10 © 2011 Delmar, Cengage Learning 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: Treatment: 10

© 2010 Delmar, Cengage Learning 11 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Torn anterior cruciate ligament –Females are now more susceptible –Can occur from contact or noncontact causes Symptoms: Treatment: 11

© 2010 Delmar, Cengage Learning 12 © 2011 Delmar, Cengage Learning Animation - ACL Click Here to Play ACL Animation

© 2010 Delmar, Cengage Learning 13 © 2011 Delmar, Cengage Learning 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 13

© 2010 Delmar, Cengage Learning 14 © 2011 Delmar, Cengage Learning 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: Treatment: 14

© 2010 Delmar, Cengage Learning 15 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Epiphyseal (growth-plate) injuries –Knee is subject to sports-induced trauma at the centers of bone growth in skeletally immature athletes –May alter the length of the affected bone Serious injury for a growing athlete 15

© 2010 Delmar, Cengage Learning 16 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Osgood-Schlatter condition –Group of symptoms involving the tibial tubercle epiphysis Symptoms: Treatment: 16

© 2010 Delmar, Cengage Learning 17 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Iliotibial band syndrome –Occurs when there is inflammation of the iliotibial band Irritation usually occurs over the outside of the knee joint, at the lateral epicondyle Treatment: rule out mechanical problems or training errors, proper footwear, ice, and stretching 17

© 2010 Delmar, Cengage Learning 18 © 2011 Delmar, Cengage Learning Knee Injuries (cont’d.) Fractures –Result of high-energy trauma –Vary in location and severity Patella fracture is usually the result of direct impact to the anterior knee Distal femoral and proximal tibial fractures may occur from violent twisting injuries 18

© 2010 Delmar, Cengage Learning 19 © 2011 Delmar, Cengage Learning Conclusion The knee is the largest joint in the body, and one of the most prone to injury –Made up of the femur, tibia, and patella –Also contains large ligaments that help control motion These ligaments connect bones and brace the joint against abnormal types of motion Other parts of the knee, like cartilage, cushion the joint and help it absorb shock during motion 19