Spontaneous Osteonecrosis of the Knee - SONK. Also known as: Ahlbackâs disease. A condition of unknown aetiology characterized by the development of an area of osteonecrosis on the weight-bearing surface of the medial femoral condyle.
Friday 8 November 2013 09.16 EST First published on Friday 8 November 2013 09.16 EST. When 33 Chilean miners were hauled to the surface after 69 days trapped in a collapsed copper mine in 2010, more than a billion people around the world tuned in to watch as the rescue was broadcast live on television.
Image: A Valdivia street after the earthquake of 22 May 1960. The temblor caused localised tsunamis that severely battered the Chilean coast, with waves up to 25 metres. Image: Aerial view of coastal area on Isla Chiloe, Chile, showing tsunami damage and wave extent.