The authors and the journal apologise for errors that appeared in Figure 2 of this article published in the January issue, Vol 166, pp 87-97. The errors relate to the number of asterisks given to represent the P-values for odd ratios (OR) of the comparisons with 0 to !6 months interval. In Figure 2a

In this commentary we provide a selective overview of the kinds of insights that a sociology of expertise can provide in better articulating the stakes of current politico-epistemic conflicts catalysed by COVID-19. In doing so, we argue that one of the ways that sociology can fruitfully engage with the pre-, intra- and post-pandemic societal responses is through its distinctive perspective on expertise. To exemplify the potential of this perspective, we present three dimensions of the pandemic that a sociology of expertise opens up avenues for exploring: (a) the formation of expert publics; (b) transnational expert dynamics; and (c) expert moral authority. Together these three dimensions show how expertise constitutes a crucial nexus for understanding how contemporary societies respond to global crises.

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Careful technique of examination of the knee joint allows to establish the diagnosis of the most frequent knee joint injuries already through simple clinical and radiological evaluation: Recurrent dislocation of the patella with the Apprehension sign; meniscal injuries with the test of McMurray, pain on the joint line and pain on passive hyperextension; the anterior cruciate ligament tear with Lachman's sign and the Pivot Shift test and posterior cruciate injury with the Sag sign. Further imaging techniques allow to establish a definite diagnosis, which has replaced in many cases the classical, purely diagnostic arthroscopy. Thanks to careful aspiration of the knee joint the patient can be referred with a more precise diagnosis to the traumatologist and orthopaedic surgeon. Meniscal lesions don't have to be treated as emergencies with exception of the locked knee. Equally, in presence of a fresh tear of the anterior cruciate ligament a delay of surgery for eight weeks may be beneficial, be it only to rehab and prepare the knee joint for surgery. Posterior cruciate ligament tears should only be treated by a few centers, since they demand a high degree of experience. The same accounts for the new techniques for the treatment of cartilage lesions like the mosaicplasty or the autologous chondrocyte implantation.

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