Uncemented hip replacements require a tightly fitting prosthesis with a surface into or onto which, bone grows.
One advantage over cemented replacements is that the uncemented variety is easier to revise - and thus should be considered in a young patient who may require a series of hip replacements with increasing age.
The principal drawbacks are that weight-bearing is not allowed for 6 weeks to 3 months after the operation, and that in the long term, the prosthesis may loosen more rapidly than a cemented one.
1-5% of patients complain of significant hip pain after an uncemented joint replacement; there may be a correlation between this and ingrowth of bone into the prosthesis - more growth causing more pain.
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