Spinal fusion: A surgical procedure in which two or more of the vertebrae in the spine are united together so that motion no longer occurs between them. Spinal fusion may be done to treat a number of conditions, including scoliosis, deformity, fracture, and disc disease. Bone grafts are usually placed around the section of the spine to be fused. The body then heals the grafts over several months, which joins the vertebrae together. The bone for the graft may be taken from another bone in the patient (autograft) or from a bone bank (allograft).
Main article: Weather in Madrid in May. The average maximum temperature in Madrid in May is 72Â°F/22Â°C and the average minimum temperature is 48Â°F/9Â°C.
Madrid has a cold semi-arid steppe climate. The temperature typically varies from 33Â°F to 92Â°F over the course of the year, and is rarely below 23Â°F or above 99Â°F. The hot season lasts for 89 days, from June 14 to September 11, with an average daily high temperature above 83Â°F.