What is the difference between AMA & total hip replacement?

Specialties Orthopaedic


I used to work in a medical ward & I just rotate to an orthopedic ward this week

however, I have never been to an orthopedic ward before (even when I was a student) and so I have knowledge deficit about orthopedic nursing.:crying2:

I want to ask what the difference between AMA and THR is (I have searched information on the internet but still cannot understead:confused:)

Moreover, can anyone introduce some useful websites or nexkbooks to me?

Thanks a lot:yeah:

Specializes in OR.

I want to help you distinguish between AMA & THA. I do have some understanding of ortho and would be able to help but I don't know that AMA stands for anything other than the American Medical Association.

Total Joint Arthroplasty can be performed using a number of hip replacement systems.

The implants vary according to the medical manufacturer. Some examples of the various ones are Depuy, Stryker, Zimmer and so on.

When you put in a total joint, the implants may vary in material, eg you can have a chromium cobalt femoral head, a ceramic femoral head and so on. Each hip system has a different set of instruments that are taylored to implant these components.

Now, you can do a hemi arthroplasty where you implant the femoral component of the hip and you find the patient's acetabulum is still adequate to leave alone for the time being.

You have various hip systems for fractures, and various hips for when there is just some much Osteo arthritis that the patient can't mobilize any more with the pain.

I would be happy to describe AMA if I knew what the letters stood for, I don't, but I am happy to say if you look up Depuy, Stryker, Zimmer, etc. and look for ( surgical technique) you will see the various types of implant systems that are out there.

I am in Canada, therefore, I won't be as much help to you as someone from the USA, but would love to answer your question.

Specializes in OR.

I forgot to mention that when you do a THA it involves replacing each aspect of the hip.. 1) femoral stem 2) femoral head 3) acetabulum

Hope this helps:lol2:

AMA-against medical advise

AMA is austin moore arthroplasty


Specializes in OR.

Austin Moore Arthroplasty is one component. Femoral stem & Head (All in one piece) The femoral head on this prothesis is large and snaps into the acetabulum once the surgeon has pushed the stem portion down the femur. The head is pushed down with what we call an "ice cream cone" then the hip is reduced. The ice cream cone or pusher fits in the surgeons hand, is slightly hour glass in shape and has a white plastic part that is concave so that it fits onto the rounded part of the femoral head and hence "ice cream cone" The femoral part is pushed into the femur, the patients leg is rotated and the large "ball" part of the Austin Moore, fits into the patients' acetabulum.. The hip is now reduced and ready to suture closed.

Total Hip Arthroplasty is separate components. There is an acetabular shell, an acetabular liner, a femoral stem, and a femoral head.. these components are individual pieces. They all fit together.

The acetabular shell usually goes in first, then the liner snaps into the acetabular shell.

Next the femoral stem (either cemented or uncemented) is inserted.

Finally the femoral head is snapped onto the top of the femoral stem and then the surgeon reduces the hip.

The choice of hip is surgeon specific, he/she makes the choice for each patient depending on the patient's fracture, the patients health etc. Also, the type of hip may be selected because that is the surgeon's preference (eg. the hip system he/she trained on)

Hope this helps,

OR is fun... come on down...

P.S. there are more hip systems than you can imagine!!!

Specializes in Operating Theatre and Occ. Health.

Oh these acronyms! Bane of life! If you'd Googled Austin Moore, you might have had better luck! wink-1.gif

Okay: Insertion of an Austin Moore prosthesis is more correctly known as a hemi-arthroplasty and is performed for fractured necks of femur of the subcapital variety, meaning those in which the head has been deprived of a blood supply and begun to suffer avascular necrosis (death from no blood supply).


A total hip replacement is performed on hips destroyed by osteo-arthritis and therefore both the femoral head and the acetabulum have to be replaced.


Hope this has helped!

Specializes in Operating Theatre and Occ. Health.

And here's some educational websites that might help!


Total Hip Replacement

Plus there's heaps of vids on YouTube!

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