Table 2.
The comparison of clinical and radiological characteristics between the AP and PA groups
| Clinical and radiological characteristics | Group AP (n=10) | Group PA (n=17) |
|---|---|---|
| Age | 61.70±6.18 | 61.00±8.16 |
|
| ||
| Sex (M/F) | 9/1 | 13/4 |
|
| ||
| OPLL type | ||
| Continuous | 2 | 4 |
| Mixed | 6 | 11 |
| Segmental | 2 | 1 |
| Circumscribed | 0 | 1 |
|
| ||
| Interval between the initial and repeat surgeries (months)* | 102.80±60.08 | 61.44±43.04 |
|
| ||
| Change of the main OPLL lesion between surgeries* | ||
| (−) | 2 | 15 |
| (+) | 8 | 2 |
|
| ||
| Occupying ratio on the main OPLL lesion (at the time of repeat surgery) (%) | 52.22±11.51 | 44.67±12.82 |
|
| ||
| Canal anterior-posterior diameter on the main OPLL lesion (at the time of repeat surgery)* (mm) | 10.75±0.79 | 16.27±2.33 |
|
| ||
| Cobb’s angle on C2–7 (at the time of repeat surgery)* (°) | 7.44±5.54 | −3.38±11.08 |
|
| ||
| Segmental angle on the main OPLL lesion (at the time of repeat surgery)* (°) | 2.71±4.24 | −3.52±6.20 |
*
p<0.05.
group AP: patients were approached anteriorly at the initial surgery and underwent posterior approach at the repeat surgery, group PA: patients were approached posteriorly at the initial surgery and underwent anterior approach at the repeat surgery, M: male, F: female, OPLL: ossification of the posterior longitudinal ligament, negative angle: kyphotic curve, positive angle: lordotic curve