© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints 1 Joints

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system What you will learn about in this topic: 1.Definition of a joint 2.Types of joints 3.Cartilage 4.Synovial joints 5.Ligaments 6.Inflammatory cascade Joints 2

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints 3 Learning objectives By the end of this presentation you should be able to: Understand how synovial joints work Describe the different joints of the body Explain how a joint works and the importance of them in sport

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Definition of a joint A joint is the place where two or more bones meet. There does not have to be movement at a joint, but where there is, it is more significant to the actions of the sportsperson. Joints 4

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Three types of joint There are three types of joint In the body. They differ according to how much movement they allow. Joints 5 1. Immovable joints 2. Slightly movable joints 3. Freely movable joints

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Immovable joints are fixed so there is no movement at the joint. Joints 6 Any place where the bones are fused together is an immovable joint; for example, the crown of the cranium and the coccyx.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Slightly movable joints have gaps between the bones, which allow a small amount of movement. These gaps are usually filled with cartilage. Joints 7 Examples include the bones of the vertebral column and the joint of the ribs and the sternum.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Freely movable joints are designed for movement. Keeping them in good order is essential to a healthy active life, and are most important to the sportsperson. Joints 8 Examples include the joints at the wrist, hip and knee.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Examples of joints Joints 9 Pivot In the neck – rotates and tilts the head – assists the rotation of the body.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Hinge In the knee – extends and flexes – tucks knees for style and aerodynamics. Joints 10 In the arm – flexing and extending with a slight amount of rotation – used to swing and apply topspin on a ball.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Ball and socket In the shoulder – full range of movement – used when throwing a ball. Joints 11 In the hip – full range of movement – used when avoiding a tackle.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Gliding In the ankle – forward and back with slight sideways movement – used when a footballer passes the ball. Joints 12

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Condyloid/gliding In the wrist – moves forward and backwards with some slight sideways movement – used by a golfer at the ‘wrist break’ phase of swing. Joints 13

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Cartilage Cartilage acts as a shock-absorber. It protects the bone, acts as a cushion and provides almost friction-free movement in a joint. It is a smooth, sheet-like coating, present at the end of the articulating surfaces of bone and forms a barrier between the bones, stopping them wearing each other away. Joints 14

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system This is especially important in activities like long-distance running, where there is continued use of the knee joint. If the cartilage was not there, pain would occur at the joint due to the friction of the bones rubbing together. Joints 15

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Cartilage damage is common in sportspeople. A frayed cartilage decreases the efficiency of the joint and is extremely painful. Joints 16

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Synovial joints Joints 17 Synovial joints are the most movable joints in the body.

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Synovial fluid acts as packing, preventing friction between the moving parts and lubricating the joint. Like oiling the chain of a bike or putting oil in the car, synovial fluid allows all of the parts to move against each other smoothly. Synovial fluid also keeps the joint free from infection. Joints 18

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system The fluid is produced in the synovial membrane. The synovial capsule is a tough fibre that surrounds the joint holding the fluid in place. Joints 19

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Ligaments The stability of a joint relies on the strength of the ligaments – tough elastic fibres that attach bone to bone – and on the muscles supporting the joint. Running, stopping and changing direction all put pressure on the joint. If the ligaments are stretched too far, they tear and the joint dislocates. Joints 20

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Inflammatory cascade Inflammation of joints can occur after injury or short-term overuse. After an injury there is a series of events called the inflammatory cascade… Joints 21

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Call out for white blood cells to clean up the damage and clear infection Causing the area to go red Pro-inflammatory hormones triggered Injury Leading to swelling Pain occurs Joints 22

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system A healthy joint will react to injury when required. The inflammatory cascade will do its job then disappear. If it persists then it is a more chronic condition. An unhealthy joint will not be able to turn off the immune system and so will appear red and sore without reason. To avoid inflammation, wear appropriate sports wear to prevent injury. Joints 23

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Task Choose a sport and explain how four different joints are used. Describe how each of the joints helps to produce movement in the chosen sport. Joints 24

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints 25 Exam questions 1. Which of the following best describes a joint? A.A place where bones are close B.Where several bones and muscles meet allowing movement C.Where the production of movement occurs D.Where two or more bones meet but where there is not necessarily movement

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints Which joint is mainly involved in the action of kicking a football? A.Pivot joint B.Hinge joint at the elbow C.Ball and socket joint at the hip D.Hinge joint at the knee

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints 27 What you have learnt in this topic: 1.Definition of a joint 2.Types of joints 3.Cartilage 4.Synovial joints 5.Ligaments 6.Inflammatory cascade

© Folens 2009 FOR EDEXCEL A healthy, active lifestyle and your skeletal system Joints 28 Learning objectives You should now be able to: Understand how synovial joints work Describe the different joints of the body Explain how a joint works and the importance of them in sport