Surface Hippy Home       Contact Patricia Walter

« previous next »
Pages: [1]   Go Down

Author Topic: Should acetabular cups move as part of bedding in process?  (Read 988 times)

0 Members and 1 Guest are viewing this topic.

chimera191

  • Newbie
  • *
  • Posts: 4
Should acetabular cups move as part of bedding in process?
« on: March 28, 2012, 05:20:31 PM »
Following some very sage advice from Pat & co I've been trying to find out a lot more about the underlying cause of my ASR resurfacing situation that results in need for THR.  So apologies if I'm about to ask some very stupid questions.

I'd reported on another post that both cup and head had moved, they have, and that I thought they were cemented.  Common opinion was the cup wouldn't have been and the surgeon has confirmed this, but that the head was. 

However he also said something that struck me as odd and that I've been reflecting upon.  He confirmed that my cup had moved from a placement of 45 degrees to 52-3 degrees, but that this happened initially and then stabilised.  I quote him as saying " Hips often "bed-in" in this manner but most cups don't move as much as seen in Metal on Metal hips."

I guess I would have thought, particularly given the precise nature of DePuy's ASR placement instructions and the reliance and development of computer aided placement, that such products wouldn't be subject to such vagaries subsequently, but I would welcome any guidance and experience in this area please?
Logged

obxpelican

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1400
  • ~Welcome to SixBurgh~
Re: Should acetabular cups move as part of bedding in process?
« Reply #1 on: March 28, 2012, 05:30:35 PM »
Cups are press fit, actually pounded in and then with the acetabular component firmly in place the cup should not move. 

It's almost always surgical error, at least everything I've ever read.


Chuck
Logged
Chuck
RH/Biomet U/C Dr. Gross/Lee Webb
8-6-08

Dannywayoflife

  • Hero Member
  • *****
  • Posts: 1953
Re: Should acetabular cups move as part of bedding in process?
« Reply #2 on: March 28, 2012, 06:57:05 PM »
I've read that cups do migrate in the first few weeks but your talking tenths of a mm not the degree that yours seems to of moved. I aggree with chuck sounds like poor surgery to me.
Logged
Train hard fight easy LBHR 10/11/2011 Mr Ronan Treacy Birmingham England
60mm cup 54mm head

obxpelican

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1400
  • ~Welcome to SixBurgh~
Re: Should acetabular cups move as part of bedding in process?
« Reply #3 on: March 28, 2012, 07:16:33 PM »
Danny,

If you see Treacy ask him what he thinks about the quote Hips often "bed-in" in this manner but most cups don't move as much as seen in Metal on Metal hips  I think Treacy would have a good chuckle.

I read that and scratch my head, I'm like, HUH????  What is this doc smoking?  They move the whole range where the inclination should be?  Heck, 52 degrees you could actually have a chance at keeping your HR if it were not an ASR of course.  But a cup that is loose and shifts that far?

Chimera, your doctor made a mistake on the cup, any doctor can do that, it has happened to the best of doctors.  On top of it all you got a recalled device which of course is not his or your fault, but the cup, he did that and if he believes that a cup could/should migrate that far you should run don't walk and find another surgeon to do your revision.  And for the record there is no difference in how a cup is seated be it MOM or any other material it's all the same general method. 

All this is IMHO. 

I hope the revision goes well and you are walking straight, painless lines again.


Chuck
Logged
Chuck
RH/Biomet U/C Dr. Gross/Lee Webb
8-6-08

Pat Walter

  • Patricia Walter
  • Administrator
  • Hero Member
  • *****
  • Posts: 2977
  • Owner/Webmaster of Surface Hippy
    • Surface Hippy
Re: Should acetabular cups move as part of bedding in process?
« Reply #4 on: March 28, 2012, 07:26:23 PM »
Hi

I wanted to also comment that if you watched surgeons pound the acetabular cups into place, you would realize that they don't move.  That is part of placing the cup, the surgeons will take the tool and wiggle and try to move it.  Each surgeon has his own test to make sure the cup is properly placed.  I never heard of cups migrating during a break-in period.  Of course, I am not a doctor and don't know everything.  I have watched live surgeries and know the cups are placed very securly.  You can watch videos which give you the same view of how cups are pounded and placed in the acetabulum.

I wish you good luck with your upcoming revision.

Pat
Logged
Webmaster/Owner of Surface Hippy
3/15/06 LBHR De Smet

John C

  • Hero Member
  • *****
  • Posts: 595
Re: Should acetabular cups move as part of bedding in process?
« Reply #5 on: March 28, 2012, 07:47:35 PM »
I got the impression from my surgeon that the rough surface on the cup caused what he called a "scratch fit", meaning that the rough surface dug into the bone, and created a solid fit. He also said that any micro motion during the initial healing period could cause the bone to not ingrow, and cause later loosening of the cup. I got the impression that if he saw any movement in the cup from where he initially hammered it in place, it would be cause for concern.
Logged
John/ Left uncemented Biomet/ Dr Gross/ 6-16-08

Dannywayoflife

  • Hero Member
  • *****
  • Posts: 1953
Re: Should acetabular cups move as part of bedding in process?
« Reply #6 on: March 28, 2012, 09:04:17 PM »
Ha I'll ask Treacy that when I see him chuck  ;D I know what his answer will be though! He seems to have a low tolerance for surgeon incompetence and bull s##ting! ;D
Logged
Train hard fight easy LBHR 10/11/2011 Mr Ronan Treacy Birmingham England
60mm cup 54mm head

Hip Talk About Hip Resurfacing

Re: Should acetabular cups move as part of bedding in process?
« Reply #6 on: March 28, 2012, 09:04:17 PM »
Pages: [1]   Go Up
« previous next »
 

Advertisement

Dr. Gross Cementless Hip Resurfacing Dr. Kusuma Hip Resurfacing Surgeon


View My Stats

The opinions expressed on Hip Talk belong to each individual member. Patricia Walter is the Webmaster/Owner of Surface Hippy® . She is not a doctor or medically trained. She provides information about hip resurfacing and expresses her opinion about many hip resurfacing topics. She does not provide medical advice since only a qualified hip resurfacing surgeon can provide a patient with medical advice.

Hip Talk Moderation

Authority

The Hip Talk Discussion Group or forum is moderated on a Daily basis.
The moderators and administrators are volunteers. Patricia Walter and obxpelican.

The moderators and forum members are not regarded as health professionals.

Complementarity

The information provided on this forum is designed to support, not replace, the direct relationship between patients and health professionals.

Privacy

We remind you that any message can be read, used, reproduced and cited by all.
You do have the option to delete your messages. However, under exceptional circumstances, you can contact the moderators to do so. Thus, please take care regarding the information that you post.

Messages

The moderators and members should conduct themselves at all times with respect and honesty.

By using our forums, you agree to post information that is true and correct to the best of your knowledge and is of your personal experience. If the information you post is not personal experience, we request you to provide sources (references, links, etc..) whenever it is relevant and possible.

You are not allowed to post advertisements, whether in the form of text links or banners, for example.

Please keep your comments positive and polite. If you have a disagreement with another forum member, moderator or the site owner; please use the the private message feature of this forum or email the member. We try to avoid emotional conflicts on the discussion group and we will do so by removing posts and banning those that cause problems.

The moderators reserve the right to delete any messsages deemed inappropriate without notifying the author. In cases of abuse, the moderators reserve the right to ban a member of the forum. In both instances, an explanation will be provided if user requests.

Last date of modification: 10/26/2012