Fig.17.
Three-dimensional superficial reconstruction of L3-S1 vertebrae of the same patient. A saggital slice. Marked ossification at the level of attachment of the posterior longitudinal ligament of L3-L4 with deformity of the vertebral canal (1), narrowing and deformity of the intervertebral foramen of L5-S1 on the right (2).
Fig.18.
Three-dimensional superficial reconstruction (a view from the above) of a patient with acquired relative central stenosis. There are fragments of the calcified yellow ligament in the lumen of the vertebral canal (1). Osteophytes of articular processes (2) on both sides and hypertrophy of intervertebral joints (3).