There is a pair on joints, one right, one left, to the side of the spinal canal (the channel for the nerves to and from the legs).
They are behind the disk and vertebral bodies (biggest part of spinal bone). Arthropathy is degeneration, or wear & tear. It is sometimes called arthritis
, but arthrosis is more accurate. It can be painful; it can also cause nerve
pressure, that is leg pain