Trendelenburg's Siga Fig. I These drawings demonstrate what Trendelenburg described as a positive and negative sign. Note that both hands are held by an assistant and the alignment of the pelvis with respect to the ground is observed.

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The action of fast bowling in the game of cricket is known to cause injuries to the lumbar spine. We studied a group of 16-to 18-year-old fast bowlers, selected for special fraining in Western Australia. All 24 had MR scans of the spine, 22 had radiographs and CI' scans; in 20 the bowling technique was analysed biomechanically.There was a high incidence of back pain and this was always associated with a radiological abnormality.Pars interarticularis defects were diagnosed in 54% and intervertebral disc degeneration in 63%. Bowling actions which involved counter-rotation were associated with a higher incidence ofboth injuries.

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