The Official journal of the China Association of Rehabilitation of Disabled Persons and the 88^th Hospital of PLA

Composite Impact Factor:

0. 948 (2015)

Total citation frequency: 3868 (2015)

ISSN 1005-8478

CN 37-1247/R

Abstract:

Objectives

To explore significance of 3-dimensional canal occupied ratio by the ossified posterior longitudinal ligament£¨OPLL£©for prognosis evaluation of anterior surgery.

Methods

From January 2012 to December 2015, 39 patients with OPLL underwent anterior approach surgery including 22 males and 17 females with an average age of 58.0 years£¨range, 37-85 years£©. The JOA scores£¨17-score-method£©were used for outcome evaluation in all the patients. A 3D model was reconstructed from axial computed tomographic images using MIMICS17.0 software to obtain the 3D volume of the OPLL, 3D canal occupied ratio by OPLL, and 2D canal occupied ratio by the OPLL.

Results

In term of the improvement rate£¨IR£©of JOA scores, 19 patients with IR¡Ý75% were defined as the excellent group, whereas the remaining 20 patients with IR<75% were termed as the nonexcellent group. The 3D canaloccupied ratio by the OPLL proved£¨6.85¡À1.55£©% intheexcellent group,while £¨10.97¡À3.22£©% in the nonexcellent group, with a statistical difference between the two groups£¨P<0.001£©. In addition, the 2D canal occupied ratio by the OPLL£¨40.80¡À9.78£©% and£¨52.77¡À14.54£©% respectively in the twog roups, also with a significant difference£¨P=0.005£©.There was a statistically negative correlation between the 3D canaloccupied ratio by OPLL and the JOAIR £¨r=-0.789,P<0.001£©, however, no significant correlation was noted between 2D canal occupied ratio by the OPLL and the JOAIR£¨r=-0.030,P=0.800£©.

Conclusions

The 3D canaloccupied ratio by the OPLL is superior to the 2D measurement technique for evaluation of prognosis after the anterior surgery for ossification of posterior longitudinal ligament.