two types of joint inclusions are demonstrated in the lumbosacral facetal joints -- a large , fat-filled , vascular intra-articular synovial protrusion projecting into the medial part of the joint from below , and a dense , fibrous , intra-articular synovial protrusion projecting from the joint capsule into the upper medial part of the joint .
C0022417
joint
C0206207
synovial