RESULTS: Two hundred nineteen (10.4%) of all first revisions (2153 cases in 2107 patients) were for dislocation, which was the fifth cause of revision. There were 135 men and 84 women, mean age 65.9years old (24.3-92.4) at primary THA and 72.9years old (31.9-98.8) at revision. Revision surgery was performed a mean 7.1years (±7.1) after primary THA. The predictive risk factors for dislocation were: a 22.2mm diameter femoral head (risk×2.4), a posterolateral approach (risk×1.7), older age (risk×1.1), an elevated rim liner for primary THA (risk×6.6). The use of a dual mobility cup did not influence the rate of revision for dislocation (8.8%) compared to the use of a flat rim liner (9.1%).
DISCUSSION: The 10.4% rate of revision of THA for dislocation seems markedly lower than the results in the literature both for frequency and ranking. The use of elevated rim or constrained liners designed to decrease the risk of dislocation does not improve results compared to standard liners.
LEVEL OF EVIDENCE: Level IV, prospective prognostic study without a control group.
PMID: 23890966 [PubMed - as supplied by publisher]
Read more... http://www.ncbi.nlm.nih.gov/pubmed/23890966?dopt=Abstract
