Background
Methods
PD group | Non-PD group | p value | |
---|---|---|---|
N of patients | 26 | 296 | – |
Age at operation (years) median, [IQR] | 76.0 [8.0] | 75.0 [10.8] | 0.3343 |
Sex [male/female] (N of patients) | 3/23 | 66/230 | 0.1999 |
BMI (kg/m2) median, [IQR] | 22.1 [6.3] | 22.5 [4.7] | 0.1600 |
Vertebral level (N of patients) | T11: 3 | T10: 16 | 0.6112 |
T12: 8 | T11: 25 | ||
L1: 11 | T12: 116 | ||
L2: 4 | L1: 103 | ||
L2: 36 | |||
Surgical procedure (N of patients) | APSF: 2 | ASF: 19 | 0.7176 |
PSF: 3 | APSF: 27 | ||
3CO: 9 | PSF: 37 | ||
VP + PSF: 12 | 3CO: 84 VP + PSF: 129 | ||
Number of fused segment (segment) median, [IQR] | 4.0 [2.0] | 4.0 [2.0] | 0.9534 |
BMD YAM (%) median, [IQR] | 73.0 [25.0] | 69.0 [19.8] | 0.9295 |
Number of patients with existing vertebral fracture [fx/no fx] (N of patients) | 8/18 | 108/188 | 0.7338 |
Number of comorbidity (disease) median, [IQR] | 1.0 [0.0] | 1.0 [1.0] | < 0.0001 |
Follow-up period (month) median, [IQR] | 37.0 [19.0] | 44.0 [28.0] | 0.1787 |
Surgical procedure
Evaluation
Statistical analysis
Results
PD group | Non-PD group | p value | |
---|---|---|---|
Operation time (min.) median, [IQR] | 214.0 [100.0] | 237.0 [130.5] | 0.4193 |
Intraoperative blood loss (ml) median, [IQR] | 450.0 [627.0] | 402.0 [575.5] | 0.2761 |
Perioperative complication [complication/ no complication] (N of patients) | 10/16 | 45/251 | 0.0063 |
Local kyphosis angle (°) median, [IQR] | |||
Preop. | 27.0 [21.0] | 26.0 [19.0] | 0.9965 |
Postop. | 6.0 [18.0] | 8.0 [13.4] | 0.8072 |
Final | 18.7 [18.0] | 14.0 [18.0] | 0.3357 |
Amount of kyphosis correction | 10.8 [26.1] | 10.0 [16.0] | 0.6611 |
Mechanical failure (%) | 26.9 | 17.9 | 0.7464 |
JOA score improvement rate (%) median, [IQR] | 50.0 [38.5] | 53.8 [39.2] | 0.1074 |
Walking ability (N of patients) | |||
Preop. | Grade1: 2 | Grade1: 16 | 0.1030 |
Grade 2: 1 | Grade 2: 44 | ||
Grade 3: 4 | Grade 3: 86 | ||
Grade 4: 19 | Grade 4: 150 | ||
Final | Grade1: 3 | Grade1: 114 | 0.0007 |
Grade 2: 5 | Grade 2: 92 | ||
Grade 3: 12 | Grade 3: 70 | ||
Grade 4: 6 | Grade 4: 19 | ||
Subsequent vertebral fracture (%) | 38.4 | 35.1 | 0.7338 |
Surgical invasion
Perioperative complication | PD group (N of patients) | Non-PD group (N of patients) |
---|---|---|
Overall [incidence] | 10 [38.5%] | 45 [15.2%] |
Intraoperative complication | ||
Surgical site infection | 0 | 7 |
Neurological deficit | 1 | 6 |
Dural tear | 0 | 5 |
Epidural hematoma | 0 | 3 |
Massive hemorrhage (> 5000 ml) | 0 | 1 |
Postoperative complication | ||
Delirium | 6 | 10 |
Cardiac disease | 0 | 4 |
Gastrointestinal disease | 0 | 4 |
Deep venous thrombosis | 1 | 2 |
Urinary tract infection | 1 | 0 |
Pneumonia | 0 | 2 |
Electrolyte abnormality | 0 | 1 |
Decubitus | 1 | 0 |
Radiographic sagittal alignment
MF
Mechanical failure | PD group (N of patients) | Non-PD group (N of patients) |
---|---|---|
Overall [incidence] | 7 [26.9%] | 53 [17.9%] |
Pedicle/vertebral screw pull-out | 4 | 24 |
Intervertebral cage migration | 0 | 9 |
Uppermost vertebral fracture | 2 | 11 |
Lowermost vertebral fracture | 1 | 4 |
Hook dislodgement | 0 | 3 |
Rod fracture | 0 | 2 |