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Stem subsidence after total hip revision: 183 cases at 5.9 years follow-up
J Girard1, O Roche, G Wavreille
1Sports and Medicine Unit, North Lille University, 59000 Lille, France. j_girard_lille@yahoo.fr
Introduction:
Secondary subsidence of a revision femoral stem is often a negative predictive sign for successful osseointegration and perfect long-term stability.
Materials And Methods:
We performed a retrospective study in a series of 183 revision total hip replacements between 1996 and 2000 to evaluate the importance and risk factors of secondary subsidence with a cementless press-fit design femoral stem as well as this subsidence's consequences to osseointegration.
Results:
Secondary subsidence did not occur in 80 cases (53%), was between 0 and 4mm in 41 cases (27%); between 5 and 10mm in 17 cases (12%) and was greater than 10mm in 12 cases (8%). Mean subsidence of all patients was 3mm (0-30). There was a statistically significant negative correlation between subsidence and the quality of osseointegration (P=0.03). There was no significant relationship between component diameter and stem subsidence (P=0.9). The presence of preoperative bone deficiencies did not increase the risk of secondary subsidence (P=0.2).
Conclusion:
In the case of revision with press-fit stems, the importance of secondary subsidence should not be overestimated, because it usually does not negatively affect satisfactory osseointegration.