There's plenty of measures you can take to reduce the risk - but first you need to be clear about the process that creates the risk.
Obviously, if you change the content on a page, then Google (and the others) will re-evaluate it's relevance compared to other sites.
If the core of the site is the same - in this case, orthopedic care - then, over time, on balance, things will be much the same. But in the short term, there could be major damage, and some individual pages will, of course, be damaged forever (while new stars may appear!).
Which brings up the next point. Provided both old and new sites use domain.com, then few of your links will be damaged. Changing the home page's URL is a pretty good guarantee of losing SEO value. But even being commonsensical with domain.com doesn't protect everything; you are guaranteed to lose some deeplinks if page names are changed, but that may not matter much.
All in all, a major change is sure to cause some short term damage, and no amount of 301s will avoid that completely.
And any SEO who says different is probably just after your money.
All the above can be minimised, and that's what you need to review before a decision is made.
Be thinking about:
1. Careful planning
2. 301s
3. Incremental change.
4. Updating links
5. Compensatory SEO
6. Finding the UP Side - fixing old errors, etc.
The biggest damage is done by new file names; Cool URIs Don't Change
[ Message was edited by: Quadrille 01/10/2008 03:07 pm ]
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