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- [Voiceover] Like every other system,

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there's problems of disease and disorders

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that go with the skeletal.

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Probably one of the most
common is going to be a sprain.

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Now sprains are stretched
or torn ligaments.

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So it's not really the bone being damaged

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but it's what holds the bones together.

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If you end up stretching
out a ligament too far

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or even partially tearing it,

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it will not be able to
perform the original function.

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If you completely tear
it then all bets are off.

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Bursitis and tendinitis,

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both of these are going
to be inflammations.

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Bursitis is when a bursa becomes inflamed.

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Now a bursa is going to
be this fluid-filled sac

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found in your joints.

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Its purpose to help to
cushion and can help protect

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some of the components of the joints.

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So bursitis inflammation.

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Tendinitis also inflammation,

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but is now when a tendon
has become inflamed.

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Arthritis.

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There are many different
types of arthritis.

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It's not just one single,

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here is arthritis.

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But in general all the
various types of arthritis

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deal with inflammation of joints,

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whether it's minor inflammation,

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major inflammation something
is causing a problem.

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Some examples are Osteoarthritis,

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Rheumatoid arthritis.

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Now Rheumatoid's kind of interesting

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because in Rheumatoid arthritis

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it's your body's own cells
attacking your body's joints.

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Your own immune cells
are attacking the joints

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causing inflammation and
damage in Rheumatoid arthritis.

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Now we have Osteoporosis.

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Osteoporosis is characterized
by excessive bone loss.

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You can see the figure
on the right is figure A.

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That is healthy bone.

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The figure on the left that is figure B,

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that is Osteoporotic bone.

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You can see how in the Osteoporotic bone

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you have all these little opens,

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or channels or holes in there.

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It's making the bone that much weaker.

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That means the Osteoclast cell is working

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faster than the Osteoblast cell.

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So Osteoporosis the
calcium's being pulled out

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of the bone making the bone weaker.

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Now what's the most common age
group or gender to have this?

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Unfortunately the most common grouping

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is going to be post-menopausal females.

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Because of all the
hormone changes going on,

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those hormone changes upset
the balance of the bones

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causing the bones to have
excessive bone mass loss.

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So losing mass that losing strength

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and the bones can get
progressively weaker.