BMJ 2007; 334 doi: https://doi.org/10.1136/bmj.39164.781389.791 (Published 29 March 2007) Cite this as: BMJ 2007;334:702

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Getting the acetabular “cup” component position “just right” in total hip replacement is essential to reduce risk of dislocation and loosening and to optimise the range of motion. A comparison of imageless computer assisted navigated insertion with freehand positioning showed that computerised navigation improved performance by significantly reducing the number of outliers—that is, cups placed outside the defined safety zone (Journal of Bone and Joint Surgery 2007;89B:494-9, doi: 10.2106/JBJS.F.00529). The downside is that computerised navigation took about 20 minutes longer than manual positioning.

Older versions of the BCG vaccine may offer better protection against tuberculosis than some of the newer ones, according to a study in the Proceedings of the National Academy of Sciences of the USA (2007 Mar 19, doi: 10.1073/pnas.0700869104). Scientists compared the entire genetic sequence of several BCG strains and found many differences introduced as the microbe has …

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