What is dislocation of kneecap due to hypoplasia?

MY 4 YEAR SON KNEECAP GOES OUT TO THE LEFT WHEN HIS KNEE IS BENT HE ALSO SEEMS TO HAVE ONE LEG SHORTER THAN THE OTHER

First of all I found a site that has the definitions of these types of things and if you'll notice to the left side of that page, there are specific areas in which you can click on to check them out. This would be the first link I have included.

The second link is a sort of detailed explanation ....

The third link is the actual site in which it list various links to read about this and other disorders.

I really hope this helps.

it means that your son's knee cap is underdeveloped.... commonly called small patella syndrome

hypoplasia and hyperplasia most commonly occur before the tissues have reached maturity and are then development defects, often unknown origin.
Hypoplasia means a decreased number of cells or fibres and may be a result of disturbance of the ductless glands controlling growth and development.

I woul like to point out I am not a doctor! But I did study physiology...
Basically 'dislocation' is where a joint connecting two bones (in this case, it is the joint in the knee) goes out of place. This can be very painful, although a lot of people have conditions where their joints dislocate for no apparent reason and then 'click back' almost immediately, which usually just causes a mild discomfort.
If you have been told it is caused by hypoplasia then this means it is happening because the joint, the kneecap itself, or the muscles/tendons supporting the joint haven't formed properly.
Hypoplasia is when a certain tissue in the body does not develop properly. If your son has one leg shorter than the other and it is noticeable then maybe he has hypoplasia in one of the bones in his leg- either his thigh bone (femur) or the ones in the lower leg (tibia and fibia).

You should seek out a specialist orthopedic doctor (one who deals with bones) or a rheumatologist (muscles and tissues surrounding the bones) to discuss treatment.

I hope your son is well and that this helps!

LJ x

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