Accuracy of a portable accelerometer-based navigation system for cup placement and intraoperative leg length measurement in total hip arthroplasty: a cross-sectional study

Table 1 Group characteristics

	Previous version group (from our previous study [24])	New version group	P value
No. of hips/patients	55 hips (54)	60 hips (58)
Gender, Male/Female	10/44	13/45	0.610
Age (years)	65.7 ± 11.0	64.3 ± 15.5	0.981
Height (cm)	154.3 ± 7.4	155.8 ± 10.8	0.834
Weight (kg)	58.6 ± 11.2	62.3 ± 14.8	0.325
Side affected, left/right	28/27	31/29	0.935
Type of femoral component, CMK/S-ROM	51/4	49/11	0.079
Preoperative diagnosis ^a			0.725
OA	48	51
ON	5	9
RA	2	0
Operation time (minutes)	79.8 ± 13.0	78.7 ± 12.0	0.564

OA Osteoarthritis, ON Osteonecrosis of the femoral head, RA Rheumatoid arthritis
Values are given as the mean and the standard deviation, except for number of hips/patients and preoperative diagnosis
No data missing
^a The preoperative diagnoses were categorized into 2 classes: 1) OA or 2) ON and RA for statistical analysis

ISSN: 1471-2474