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Sonographic evaluation of hip effusion in children. Improved visualization with the hip in extension and abduction
Y L Chan1, J C Cheng, C Metreweli
1Department of Diagnostic Radiology and Organ Imaging, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong.
Insights
Placing the hip in an extended and abducted position improves ultrasound detection of hip effusions. This specific hip positioning enhances visualization of joint fluid and capsule-femoral-neck distance, aiding diagnosis.
Area of Science:
- Pediatric Orthopedics
- Diagnostic Imaging
- Musculoskeletal Ultrasound
Background:
- Hip effusions in children can be challenging to diagnose sonographically.
- Optimal hip positioning is crucial for accurate ultrasound assessment of hip effusions.
Purpose of the Study:
- To evaluate the sonographic differences in hip effusions when the hip is positioned in extension and abduction versus a neutral position.
Main Methods:
- Ultrasound examination of 21 children (aged 2-14 years) with hip pain or limping.
- Comparison of capsule-femoral-neck distance, joint fluid presence, and anterior capsule shape in extended/abducted vs. neutral hip positions.
Main Results:
- The capsule-femoral-neck distance was significantly greater (mean difference 1.6 mm, p < 0.005) in the extended and abducted position.
- Improved confidence in diagnosing anterior capsule bulging and better visualization of fluid were noted in this position.
Conclusions:
- The extended and abducted hip position enhances sonographic detection of hip effusions.
- This positioning technique offers improved diagnostic accuracy for pediatric hip effusions.
Purpose:
To assess the difference in the sonographic appearance of hip effusions when the hip was placed in the extended and abducted position as compared to a neutral position.
Material And Methods:
Twenty-one consecutive children (aged 2-14 years) with hip pain or limping were examined for hip effusions by means of ultrasound. The capsule-femoral-neck distance, the presence of joint fluid, and the shape of the anterior capsule were compared in hips in slight extension and abduction with those in hips in a neutral position.
Results:
Of the 11 positive hip effusions, the maximal distance between the capsule and femoral neck was significantly larger (p < 0.005) in the extended and abducted hip position than in the neutral hip position, with a mean difference of 1.6 mm. Convex bulging of the anterior capsule was more confidently diagnosed in 3 hip effusions in the extended and abducted hip, and better visualization of fluid between the capsule and femoral neck was achieved in 4 joint in this posture.
Conclusion:
The study demonstrated an improvement in the sonographic detection of hip effusion in the extended and abducted position compared to the neutral position.