Robot-assisted orthopedic surgery in the treatment of adult degenerative scoliosis: a preliminary clinical report

Table 1 Patient demographics in two groups

Characteristics	RA group	FH group	P value
Characteristics	N = 31	N = 66
Age (yrs)	69.8 ± 3.8	69.3 ± 5.1	0.66
Sex (M/F)	12/19	25/41	0.94
Mean BMI (kg/m²)	24.5 ± 1.9	24.5 ± 2.1	0.89
Type of scoliosis (SRS classification)			0.92
Type L	20	44
Type T	7	16
Type D	3	4
Type N	1	2
Nash-Moe classification			0.49
Grade 1	18	47
Grade 2	8	13
Grade 3	4	4
Grade 4	1	2
Mean no. of fixed segment	6.2 ± 1.4	6.2 ± 1.3	0.93
Screw parameter
Total number of screws	378	786
Average number of screws/case	12.2 ± 2.6	11.9 ± 2.4	0.60

RA group robot-assisted group, FH group freehand group, BMI body mass index, SRS classification: type L TL/lumbar only with thoracic curve < 30°, type T thoracic only with lumbar curve < 30°, type D double curve with at least one T and one TL/L both > 30°, type N bo coronal curve, all coronal curves < 30°. Nash-Moe classification: grade 1 the pedicle in the concave side starts disappearing, grade 2 the pedicle disappears, grade 3 the contralateral pedicle (pedicle in the convex side) is in the midline of the vertebra, grade 4 the contralateral pedicle crosses the midline of the vertebra

ISSN: 1749-799X