Axial plane coverage and torsion measurements in primary osteoarthritis of the hip with good frontal plane coverage and spherical femoral head.
BACKGROUND
Mechanical factors play a role in pathogenesis of primary osteoarthritis of the hip. Torsion measures were made to detect whether there is a causal relationship between increase or decrease of femoral anteversion, acetabular anteversion, and osteoarthritis. There are no studies in the literature indicating a relationship between axial plane coverage and osteoarthritis of the hip. Deficient axial plane coverage of femoral head may also play a role in pathogenesis of osteoarthritis.


METHODS
Thirty patients with primary osteoarthritis of the hip and 29 control cases were included in the study. We used the method of Anda et al. (Acta Radiol Diagn 27:443-447, 1986; Comput Assist Tomogr 15:115-120, 1991) to measure axial plane anterior, posterior coverages in patients with primary osteoarthritis of the hip. The computerized tomography sections and pelvic radiographs indicated good frontal plane coverage and spherical femoral head. In addition to anterior acetabular sector angle, posterior acetabular sector angle, horizontal acetabular sector angles for axial plane coverage detection, femoral anteversion, acetabular anteversion, and McKibbin instability index were also measured.


RESULTS
Posterior coverage was lower at osteoarthritic hips than the control group's hips (96.0 ± 16.7, 104.2 ± 10.6) (p < 0.05).


CONCLUSIONS
The results may indicate that in addition to other mechanical factors, axial plane coverage, especially the posterior coverage deficiency, may play a role in the pathogenesis of hip osteoarthritis.
Department of Orthopaedics and Traumatology, Mustafa Kemal University, Antakya, Hatay, Turkey. onurhapa@gmail.com
Onur
O
Hapa
Halil Yalçın
HY
Yüksel
Hasan Hilmi
HH
Muratlı
Ertuğrul
E
Akşahin
Serap
S
Gülçek
Levent
L
Celebi
Ali
A
Biçimoğlu
D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D005260:Female; D005270:Femur Head; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology; D014057:Tomography, X-Ray Computed; D019415:Torque