sacroiliac (SI) joint

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Figure 1: The nervous system.
Figure 2: The brain viewed from the left showing the lobes of the cerebral hemisphere, the cerebellum and the lower parts of the brain stem in continuity with the spinal cord. Coloured area: the position of the ventricles, lying deep in the brain, containing cerebrospinal fluid and continuous with the central canal of the spinal cord.

sacroiliac (SI) joint

the joint between the sacrum and the ilium of the pelvis. A synovial plane joint with very limited movement. The SI joint facilitates the torsional or twisting movement of the pelvis as the lower limbs move. Often involved in inflammatory arthritis, seen in sport in athletes with lower limb biomechanical problems. Figure 1, Figure 2.