Second Look–Clinical News and Views

If you missed these Headline News Now items the first time around, AAOS Now gives you a second chance to review them. Headline News Now—the AAOS thrice-weekly, online update of news of interest to orthopaedic surgeons—brings you the latest on clinical, socioeconomic, and political issues, as well as important announcements from AAOS.

Planning acetabular labral repairs
A review of 100 consecutive patients who received both a conventional 3-tesla magnetic resonance imaging (MRI) scan and a magnetic resonance (MRA) arthrogram finds that MRI can be sufficient for preoperative planning for acetabular labral repair. MRA detected acetabular labral tears in 72 of the 100 patients, while MRI discovered acetabular labral tears in 71 of the 100 patients. Conventional MRI recorded sensitivity of 97 percent and specificity of 100 percent for acetabular labral tears compared to arthroscopy; MRA scored 100 percent in both sensitivity and specificity.

New method for tracking MRSA
Researchers have developed a new method to track how methicillin-resistant Staphylococcus aureus (MRSA) is transmitted. A new genomics approach can compare individual MRSA isolates to precisely show genetic relatedness. The method is able to spot single-letter changes in the genetic code and to identify differences between even the most closely related of MRSA isolates. By identifying single letter changes in the individual genomes and making calculations based on the dates at which the samples were taken, the team was able to derive a mutation rate and develop an evolutionary tree of MRSA. European isolates were concentrated around the base of the evolutionary tree. The study was published in the Jan. 22 issue of the journal Science (Jan. 22, 2010).

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