基于CT检查的预椎人工同盤置換木后 椎旁骨化長期迸展讠平价.

Objective To observe the long-term progress of paravertebral ossification (PO) of adjacent segments and normal segments following cervical artificial disc replacement (CADR) based on CT examination. Methods Forty-five patients who underwent CADR were included. The segments were divided into the following groups: operative level, ad 」acent level, or non-adjacent level groups (control group). Preoperative and final follow-up CT images (range 57-108 months) were collected. We took the center of each segment of the vertebral body as the center of a circle and divided each segment into four areas: left Luschka joint area (L), right Luschka」oint area (R), anterior area (A), posterior area (P). PO from the C2/3 to C7/T1 segments in each patient was graded based on CT images. Results The proportion of high-level PO (grades 2 and 3) in every areas in the operative level group, adjacent level group, and control group was higher than that before surgery (P < 0. 05). Progression of PO in Land R areas in the operative level group was significantly more severe than that in the control group (P < 0. 05). There was no significant difference in PO progression in the A and P areas between the operative level group and the control group, and there was no significant difference in PO progression between the adjacent level group and the control group (both P > 0. 05). C . Conclusions The incidence of PO after CADR is significantly higher in comparison with that in the preoperative status. Progression of PO with CADR at the operative level is concentrated in areas of the Luschka Jointsrather than A and P areas. CADR has little influence on the progression of PO development in the adjacent segments. [ABSTRACT FROM AUTHOR]