Assessing precision and accuracy of false-profile hip radiographs.
Hip Int
; 31(2): 258-263, 2021 Mar.
Article
in En
| MEDLINE
| ID: mdl-31547722
ABSTRACT
PURPOSE:
The purpose of this study was to assess the accuracy and precision of pelvic rotation in existing false-profile (FP) radiographs and to devise a method to improve accuracy and precision of FP radiographs.METHODS:
An imaging protocol was developed to obtain FP radiographs. Pelvic rotation was calculated using the described method for FP images obtained in the 3 months prior to and after implementation of this protocol. Student's t-test and variance ratio tests were used to determine differences in mean and variance of pelvic rotation between the 2 cohorts. Pelvic rotation calculation methodology was validated by using fluoroscopic C-arm to obtain AP and rotated images of 10 osteologic pelvises. The ratio of the distance between hip centres of each rotated image and AP image (WP/W) was determined. Intraclass coefficient correlation (ICC) was used to verify the relationship between WP/W and pelvic rotation.RESULTS:
Mean WP/W was 0.47 (95% CI, 0.45-0.49). There were significant differences in mean pelvic rotation of the pre-protocol group (47.6°; 95% CI, 45.6-49.5°) and the post-protocol group (60.0°; 95% CI, 58.7-61.3°, p < 0.0001). Additionally, there was a significantly wider distribution of measurements in the pre-protocol group (SD = 7.9°) compared to the post-protocol group (SD = 5.7°, p = 0.0035).CONCLUSIONS:
The quality of FP radiographs obtained in the clinical setting may be inconsistent. Standardising FP imaging produces more accurate images. Appropriate FP radiographs should have a distance between hip centres that is approximately 0.5 times the same distance found on an anteroposterior (AP) radiograph.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pelvis
/
Hip Joint
Type of study:
Diagnostic_studies
/
Guideline
Limits:
Humans
Language:
En
Journal:
Hip Int
Year:
2021
Document type:
Article
Affiliation country: