Table 2: Subject Characteristics and results of analysis for the factors influencing nerve palsy.

All Patients
(N = 6123)
Palsy Patients
(N = 14)
Non-Palsy Patients
(N = 6109)
P Value
Age (year)
(mean ± SD)
62.0±10.9 58.5± 8.0 62.1± 10.9 0.11
Gender (Male: Female) 959:5164 0:14 959:5150 0.11
Body Height (cm)
(mean ± SD)
153.6±46.0 151.5± 6.2 153.6± 46.2 0.24
Body Weight (Kg)
(mean ± SD)
55.7±10.3 52.0± 7.8 55.8± 10.4 0.04
Body Mass Index (Kg/m2)
(mean ± SD)
24.7±11.9 22.7± 3.0 24.7± 12.0 0.04
Affected side (left: right) 2980:3143 8:6 2972:3137 0.53
Pre-operative Range of Motion (degree)
Flexion (mean ± SD) 77.5±25.5 75.7± 29.9 77.6± 25.5 0.82
Extension (mean ± SD) -5.3±10.1 -7.9± 11.6 -5.2± 10.1 0.40
Abduction (mean ± SD) 17.3±11.6 16.4± 9.1 17.3± 11.6 0.72
Adduction (mean ± SD) 12.6±8.4 12.9± 11.9 12.6± 8.3 0.94
External Rotation
(mean ± SD)
24.3±15.9 22.5± 21.6 24.3± 15.8 0.77
Internal Rotation
(mean ± SD)
7.1±20.8 15.0± 24.2 7.0± 20.7 0.24
Diagnosis (number of joint)
Osteoarthritis for subluxation 4752 7 4745 0.01
Primary Osteoarthritis 234 1 233 0.52
Completely Dislocated Hip 359 3 356 0.01
Osteoarthritis for Perthes disease 18 0 18 0.84
Osteoarthritis for trauma 129 1 128 0.19
Rheumatoid Arthritis 93 0 93 0.64
Osteonecrosis of the femoral head 235 2 233 0.04
Rapidly Destructive Coxarthropathy 175 0 175 0.81
Ankylosed Hip Joint 107 0 107 0.61
Skeletal Dysplasia 14 0 14 0.86
Previous piogenic arthritis 38 0 38 0.77
Previous hip Osteotomy 528 1 527 0.84
Pre-operative JOA Hip score
Total (mean ± SD) 47.0± 13.8 49.1± 8.8 47.0± 13.8 0.42
Pain (mean ± SD) 15.7± 8.5 16.9± 8.5 15.7± 8.5 0.62
Gait (mean ± SD) 9.2± 3.9 9.6± 3.8 9.2± 3.9 0.69
ROM (mean ± SD) 10.9± 4.8 10.4± 4.8 10.9± 4.8 0.67
ADL (mean ± SD) 24.3±15.9 12.2± 3.9 11.4± 3.1 0.51
Surgical Factors
Operation time (min)
(mean ± SD)
44.4± 19.2 50.2± 16.0 44.3± 19.2 0.19
Operation bleeding (g)
(mean ± SD)
240.3± 153.0 267.7± 216.5 240.2± 152.9 0.64
Post-Operation bleeding (g)
(mean ± SD)
467.8± 275.2 524.8± 323.7 467.7± 275.1 0.52
Total bleeding (g)
(mean ± SD)
682.4± 329.4 792.5± 417.9 682.3± 329.3 0.34
leg delongation (cm)
(mean ± SD)
1.34± 1.37 1.96± 1.22 1.33± 1.37 0.08

SD: Standard Deviation.
JOA: Japan Orthopaedic Association
ROM: Range of Motion
ADL: Activities of Daily Living