[Effect of morphological changes in proximal femur on prosthesis selection of total hip arthroplasty in patients with ankylosing spondylitis].
OBJECTIVE
To investigate the effect of the morphological changes in the proximal femur on the prosthesis selection in the total hip arthroplasty in the patients with ankylosing spondylitis.


METHODS
The experimental group was composed of 13 patients (16 hips) with ankylosing spondylitis, which was treated with the total hip arthroplasty, and the control group was composed of 16 patients (19 hips) with non-ankylosing spondylitis, which was also treated with the total hip arthroplasty. In the two groups, the measurements of Singh index, canal flare index, morphological index of the cortex and cortical index were performed in the two groups.


RESULTS
The results of the statistical analysis on Singh index, canal flare index, morphological index of the cortex and cortical index in the experimental group were 3.81 +/- 0.54, 2.63 +/- 0.41, 2.02 +/- 0.38 and 1.69 +/- 0.69, respectively, but 4.63 +/- 0.62, 3.03 +/- 0.27, 2.76 +/- 0.28 and 2.12 +/- 0.24, respectively in the control group. There was a significant difference in Singh index, canal flare index, and morphological index of the cortex between the two groups (P < 0.05), while there was no statistical difference in cortical index between the two groups (P > 0.05). The patients with ankylosing spondylitis had more serious osteoporosis in their proximal femur.


CONCLUSIONS
Cemented femoral prosthesis should be used in the total hip replacement in patients with ankylosing spondylitis, and the revision total hip arthroplasty should be performed on patients with more serious osteoporosis.
Yang
Pei
P
Department of Orthopedics, Second Hospital of Xi'an Jiaotong University, Xi'an Shaanaxi, 710004, PR China. ypbone@163.com
Wang
Chunsheng
C
Wang
Kunzheng
K