Cementless total hip arthroplasty for three different degrees of hip involved secondary to ankylosing spondylitis: an analysis of 195 hips

Table 1 Perioperative demographics and component information of all included patients

Variable	Group A	Group B	Group C	P value
Demographic characteristics
M/F	58/11	38/2	24/4	0.342
L/R	54/40	22/27	26/26	< 0.001*
Age (years)	42.2 ± 13.8	40.6 ± 13.3	38.8 ± 8.5	0.311
Height (cm)	163.5 ± 7.9	165.6 ± 7.2^a	161.0 ± 6.7	0.016*
Weight (kg)	60.4 ± 8.7	61.6 ± 8.4	58.1 ± 8.0	0.155
BMI (kg/m²)	22.6 ± 2.8	22.4 ± 2.4	22.4 ± 2.8	0.916
HLA B27 positive	58 (84.1%)	35 (87.5%)	24 (85.7%)	0.885
Average follow-up time (months)	79.4 ± 29.5	80.6 ± 28.9	79.1 ± 28.9	0.966
Bearing surfaces (no. of hips)				0.132
CoC bearing	64 (68.1%)	41 (83.7%)	37 (71.2%)
CoP bearing	30 (31.9%)	8 (16.3%)	15 (28.8%)

Values are expressed as mean ± SD or number or number of cases (percentage)
P values with statistical significance are marked with *
M male, F female, L left, R right, BMI body mass index, HLA B27 human leukocyte antigen B27, CoC ceramic-on-ceramic bearing, CoP ceramic-on-polyethylene bearing
^aSignificantly different from group C

ISSN: 1749-799X