Bones and Injuries

7/27/2019 Bones and Injuries

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Types of Bones in the Human Body

There are 5 types of bones in the human body. These are longbones , short bones , flat bones , irregular bones and sesmoid bones .

Long Bones

Long bones are some of the longest bones in the body, such as the Femur, Humerus and Tibia but are also some of the smallest including the Metacarpals, Metatarsals and Phalanges. The classification of a long bone includes havinga body which is longer than it is wide, with growth plates (epiphysis) at either end, having a hard outer surface of compact bone and a spongy inner known an cancellous bone containing bone marrow. Both ends of the bone arecovered in hyaline cartilage to help protect the bone and aid shock absorbtion.

The femur - a long bone

Short Bones

Short bones are defined as being approximately as wide as they are long and have a primary function of providingsupport and stability with little movement. Examples of short bones are the Carpals and Tarsals - the wrist and footbones. They consist of only a thin layer of compact, hard bone with cancellous bone on the inside along withrelatively large amounts of bone marrow.
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Flat Bones

Flat bones are as they sound, strong, flat plates of bone with the main function of providing protection to the bodiesvital organs and being a base for muscular attachment. The classic example of a flat bone is the Scapula (shoulder blade). The Sternum (breast bone), Cranium (skull), os coxae (hip bone) Pelvis and Ribs are also classified as flatbones. Anterior and posterior surfaces are formed of compact bone to provide strength for protection with the centreconsisiting of cancellous (spongy) bone and varying amounts of bone marrow. In adults, the highest number of redblood cells are formed in flat bones.

The scapula - a flat bone

Irregular Bones

These are bones in the body which do not fall into any other category, due to their non-uniform shape. Goodexamples of these are the Vertebrae, Sacrum and Mandible (lower jaw). They primarily consist of cancellous bone,with a thin outer layer of compact bone.

Vertebrae - irregular bones


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Sesamoid Bones

Sesamoid bones are usually short or irregular bones, imbedded in a tendon. The most obvious example of this is thePatella (knee cap) which sits within the Patella or Quadriceps tendon. Other sesamoid bones are the Pisiform(smallest of the Carpals) and the two small bones at the base of the 1st Metatarsal. Sesamoid bones are usuallypresent in a tendon where it passes over a joint which serves to protect the tendon.

The patella - a sesamoid bone

Types of joints in human body

A Ball and Socket

B Pivot

C Hinge

D Gliding

A joint is the point where two or more bones meet. There are three main types of joints; Fibrous (immoveable), Cartilaginous (partially moveable) and the Synovial (freely moveable) joint.

Fibrous joints

Fibrous (synarthrodial): This type of joint is held together by only a ligament. Examples are where the teeth are heldto their bony sockets and at both the radioulnar and tibiofibular joints.

Cartilaginous

Cartilaginous (synchondroses and sympheses): These joints occur where the connection between the articulatingbones is made up of cartilage for example between vertebrae in the spine.


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A cartilagenous joint between two vertebrae

Synchondroses are temporary joints which are only present in children, up until the end of puberty. For examplethe epiphyseal plates in long bones. Symphesis joints are permanant cartilagenous joints, for example the pubicsymphesis.

Synovial Joints

Synovial (diarthrosis): Synovial joints are by far the most common classification of joint within the human body. Theyare highly moveable and all have a synovial capsule (collagenous structure) surrounding the entire joint, a synovialmembrane (the inner layer of the capsule) which secretes synovial fluid (a lubricating liquid) and cartilage known ashyaline cartilage which pads the ends of the articulating bones. There are 6 types of synovial joints which areclassified by the shape of the joint and the movement available.

Types of Synovial Joint

Joint Type Movement at joint Examples Structure

Hinge Flexion/Extension

Elbow/Knee Hinge joint
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PivotRotation of one bone aroundanother

Top of the neck (atlas and axis bones)

Pivot Joint

Ball andSocket

Flexion/Extension/Adduction/

Abduction/Internal & ExternalRotation

Shoulder/Hip Ball and socket joint

SaddleFlexion/Extension/Adduction/

Abduction/Circumduction

CMC joint of the thumb Saddle joint

CondyloidFlexion/Extension/Adduction/

Abduction/Circumduction

Wrist/MCP & MTP joints Condyloid joint


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Gliding Gliding movements

Intercarpal joints Gliding joint

Sports Injuries The aim of this lesson is to learn about common sporting injuries and

prevention techniques (Equivalent to UK GCSE Physical Education)

Suffering an injury as a result of playing sport is not uncommon. There are two types of injury:

Acute Injuries

Acute injuries happen as a result of a sudden trauma to the body, for example in a football or rugby tackle, or beinghit with a hockey ball. They can cause lots of damage to bones, muscles, tendons and ligaments and result inimmediate pain, and usually swelling with a loss of function. They can be a result of:

Colliding: with another player (as in a tackle) or with an object (such as a goal post) Being hit: usually by a ball (as in cricket or squash), a stick or racket (as in hockey or lacrosse) or

sometimes an opponent (boxing) Falling: usually either at speed (like when cycling) or from a height (rock-climbing)

Chronic Injuries

Chronic injuries are also known as overuse injuries and are a result of continuous stress on an area. Examples of overuse injuries are achilles tendonitis, shin splints or tennis elbow. These injuries tend to come on gradually over aperiod of time and the athlete often can't recall when it first started hurting.

To try to avoid chronic overuse injuries you should make sure you get enough rest, don't train too hard, make sureyou wear the right footwear, have the right equipment for you and develop good techniques.

Soft Tissue Injuries

Soft tissue is basically anything that isn't bone! So muscles, ligaments, tendons, skin, cartilage etc. Soft tissue injuriescan be either chronic or acute. They can also be open or closed:

Open

Open injuries are when the skin is broken through cuts, grazes etc


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Closed

Closed injuries happen when the skin stays intact, and the injury is underneath the skin. Here are some examples:

Sprains - ligament damage. Ligaments attach bones to bones and keep a joint together. Sprains can occur as a result of a violent twisting or side-ways movement to the joint (such as when you roll the ankle over andsprain it)

Strains - muscle damage. These are also known as pulled muscles and can vary in severity with some onlycausing minor damage and other tearing the whole muscle (a rupture)! These are usually caused byoverstretching. The hamstrings are the most common example

Bruising - bleeding underneath the skin. This usually happens as a result of an impact such as being hitwith a cricket ball

Dislocations - a bone is pulled away from the normal joint position. The most common example is theshoulder, where the humerus (arm bone) is pulled out of the socket. This can cause damage to thesurrounding soft tissues and must be scanned with an MRI before being repositioned

Cartilage tears - cartilage within the knee is most commonly injured. This happens through violent twistingor impacts which force the knee out of line

FracturesFractures are breaks or cracks in the bone. A broken bone is the same as a fracture! They can also be either open or closed.

Closed fractures are more common and mean that the skin isn't broken Open fractures involve the broken end of the bone coming through the skin All fractures usually cause bruising and swelling because of associated damage to surrounding blood

vessels They are also very painful because nerves within the bone are damaged A stress fracture is a thin crack in a bone, which can be caused by overuse and continuous stress to the

bone. These are common in the legs of runners and soldiers. Stress fractures are the only form of chronicbone injury, all other fractures are acute

Injury Prevention

It is possible to prevent a large number of injuries. Just follow these tips to help you stay injury free!

Preparation

Remove any jewellery, watches or loose clothing that could get caught Make sure you have the right equipment and that its all in good condition Inspect the playing area to make sure its in good condition - fill in any divots and remove any debris or litter Warm-up thoroughly before you start

Whilst playing

Make sure you know the rules of the game and stick to them Use good technique to avoid overuse injuries Only play with people who are of the same ability, size and strength as you Wear the right footwear for the sport and the conditions Wear any protective equipment where possible Make sure you have a referee or umpire to ensure everyone sticks to the rules
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