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January 11, 2018. BW: Label the bones (#2, 4, 6, & 7). The Knee. Chapter 18. Objectives. Describe the functions of the knee Describe some of the ligament structure of the knee Explain the function of the patellofemoral joint List and define some sports-related injuries of the knee.
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January 11, 2018 BW: Label the bones (#2, 4, 6, & 7)
The Knee Chapter 18
Objectives • Describe the functions of the knee • Describe some of the ligament structure of the knee • Explain the function of the patellofemoral joint • List and define some sports-related injuries of the knee
The Knee • The knee joint is one of the most complex joints in the body • The knee is composed of 3 major bones and muscle groups
Bones of the Knee • The end of the femur flares at its distal end into a pair of rounded prominences called condyles (these are labeled as medial and lateral) • The proximal end of the tibia is flat and is referred to as the tibial plateau • The joint where the femur and tibia come together is called the tibiofemoral joint
Tibiofemoral Joint • Weight-bearing, hinged joint held together with a joint capsule and several important ligaments • The motions at this joint are limited to flexion, extension, and a few degrees of rotation of the tibia on the femur
Cartilage • There are 2 types of cartilage found in the knee joint • The ends of both the tibia and femur are coated with a protective layer of smooth articular cartilage • Provides a smooth surface for gliding of the joint
Cartilage • Between the tibia and femur are 2 crescent-shaped wedges of cartilage called menisci • The medial meniscus: lies between the medial femoral condyle and the medial tibial plateau • The lateral meniscus: lies between the lateral femoral condyle and the lateral tibial plateau
The Menisci • Play several very important roles in the health and function of the tibiofemoral joint • They aid in shock absorption, distribute forces, and improve stability of the femur as it rides on the tibia • They are bathed with synovial fluid
January 22, 2018 • Matching the correct letter to the best description. A. Condyle B. Tibial plateau C. Sesamoid D. Crepitus 1.The rounded prominence found at the point of articulation with another bone 2. A grinding noise or sensation within a joint 3. The top, flat portion of the tibia 4. A small bone formed in a tendon where it passes over a joint **New bell work procedure**
Ligaments of the Knee • There are 4 major ligaments that connect the femur and tibia together • Together they provide stability during walking, running, jumping, or any movement involving the lower extremities
Ligaments of the Knee • Two ligaments are found on the outside of the knee • They are aligned vertically connecting the lateral and medial femur and tibia • These ligaments are called the medial collateral ligament (MCL) and the lateral collateral ligament (LCL)
Ligaments of the Knee • Medial Collateral Ligament (MCL) • Connects the medial femur and the medial tibia • This ligament is in place to help provide stability to the medial knee during activity
Ligaments of the Knee • Lateral Collateral Ligament (LCL) • Connect the lateral femur and the lateral tibia and fibula • Provides stability to the lateral knee during activity
Ligaments of the Knee • There are 2 more ligaments that are located within the knee joint • These ligaments are called the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL) • Cruciate comes from the Latin word meaning “cross” • These 2 ligaments cross each other in the knee joint
Ligaments of the Knee • Anterior Cruciate Ligament (ACL) • Attaches to the anterior aspect of the tibial plateau • It crosses the PCL anteriorly and runs from the lateral femur and attaches on the medial tibia • Becoming a fairly common injury in athletics and with the general public
Ligaments of the Knee • Posterior Cruciate Ligament (PCL) • Attaches to the posterior aspect of the lateral tibia • It crosses posteriorly to the ACL and runs from the medial femur and attaches to the lateral tibial plateau
January 24 • Draw a diagram labeling the following knee structures… • Femur • Tibia • Fibula • Patella • ACL,MCL, LCL, PCL
Knee Injuries • Patellofemoral Problems • Not always easy to identify this region as the source of the athlete’s complaints, or to isolate the causative factors from the many possible causes • Understanding the biomechanics of the knee and entire lower extremity is essential for successful management of patellofemoral problems
Knee Injuries • Patellar Tendonitis • Inflammation of the patellar tendon is often seen in sports that involve jumping • Often referred to as jumper’s knee • High force and repetitive strain frequently causes tendonitis of the patellar tendon
Knee Injuries • Medial Collateral Ligament Sprain • Usually caused by a blow to the outside of the knee or a high-energy twisting maneuver • Results in a valgus force on the medial tibiofemoral joint • Pain and tenderness are felt on the medial aspect of the knee • These sprains are categorized by either Grade I, II, III
Knee Injuries • Lateral Collateral Ligament Sprain • Located on the lateral side of the knee and is not frequently involved in sports injuries • Can be injured by a blow to the medial knee which results in a varus stress to the knee joint
Knee Injuries • Anterior Cruciate Ligament Tear: • Usually occurs due to a blow to the posterior knee or a sudden violent twist in the knee during activity • ACL is in place to restrict excessive movement of the tibia during rotation and too much movement of the tibia anteriorly
ACL • ACL tears have become increasingly more common in female athletes over the past couple of decades • Research shows that female athletes who participate in basketball and/or soccer are 4 – 6 times more likely to sustain an ACL injury than males who play the same sport • 70% of ACL injuries in females come from noncontact situations
ACL Tear in Females • Biomechanical Factors: females tend to use their quad muscles more than males. Females tend to land on a flat foot, rather than the toes, which contribute to the increased injury rate • Hormonal Influences: Research is being done to determine if there is an increased chance for tear during menstrual cycle
ACL Tear in Females • Environmental Factors: shoes worn during participation may increase risk of a tear • Anatomical risk factors: the space allowed for the ACL may be smaller than those of male athletes
ACL Tear in Athletes • An example would be a basketball player making a rapid change of direction • Once an ACL is stretched or ruptured, it will not heal • ACL tears are often accompanied by a meniscus and/or MCL sprain • ACL injuries do not follow the same grade scale as MCL or LCL; they are either damaged or not damaged
Posterior Cruciate Ligament Tear • There has not been a lot of research done on PCL injuries because it is injured far less often than other ligaments • Most athletic PCL injuries occur during a fall on the flexed knee with the foot plantar flexed • Another common cause of injury is in motor vehicle accidents
Meniscus Tears • The menisci help make a more concave surface for the condyles to rest and glide on, and thus make the knee joint more stable • The medial meniscus is more easily torn because it is attached more securely than the lateral meniscus • Both menisci can be torn with sudden twist that catches between the femur and tibia and over time due to lack of rubbery consistency
Medial Meniscus Surgery • Stone Clinic :: Videos: Lateral Meniscus Replacement
Osgood-Schlatter Condition • A group of symptoms involving the tibial tubercle epiphysis • The tibial tubercle is a small bump on the tibia where the patella tendon of the quads muscle attaches • This condition effects males ages 12-16 and females ages 10-14
Osgood-Schlatter Condition • The layer under the hard bone of the tibial tubercle is fibrocartilage and is different from any of the body’s other growth cartilage areas • Repetitive traction of the quads may cause disruption and inflammation in the layers of the tubercle • The femur is growing faster than the quads
Define the following: A. Condyle F. Sesamoid B. Valgus G. Synovial fluid C. Tibial plateau H. Effusion D. Patellofemoral joint I. Varus E. Crepitus J.Epiphyseal plate • The medial meniscus lies between? • The menisci are in place to aid in? • The collateral ligaments of the knee are found? • The MCL adds stability during? LCL? • What 2 types of cartilage are found in the knee? • The ACL runs from _________ to __________? PCL? • A MCL sprain often occurs during? • Osgood-Schlatter Condition is a disorder to the? • ACL tears are most often the result from? PCL? • What are some possible reasons why female athletes have a greater incidence of ACL injuries? • Why is Osgood-Schlatter Condition painful?