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Quantitative assessment of joint space width with an electronic caliper
P Hilliquin1, E Pessis, J Coste section sign
1Service de Rhumatologie, Centre Hospitalier Sud-Francilien, Corbeil-Essonnes, France. hilliquin@webmails.com
Osteoarthritis and Cartilage
|July 20, 2002
Summary
An electronic caliper accurately measures joint space width (JSW) in osteoarthritis (OA) hip X-rays. This reproducible and simple technique is suitable for routine evaluation of OA progression.
Area of Science:
- Radiology
- Orthopedics
- Rheumatology
Background:
- Joint space narrowing (JSN) is a key marker for osteoarthritis (OA) progression.
- Accurate measurement of JSN is crucial for monitoring OA.
- Existing techniques for JSN measurement have limitations.
Purpose of the Study:
- To evaluate the accuracy and reproducibility of an electronic caliper for measuring joint space width (JSW) in hip osteoarthritis (OA).
Main Methods:
- An electronic caliper was used to measure JSW on 100 hip radiographs.
- Measurements included joint space width and femoral head diameter.
- Intraclass correlation coefficients were calculated for intraobserver and interobserver reliability.
Main Results:
- High intraobserver reliability for JSW (0.96-0.99) and femoral head diameter (0.84-0.98).
- Strong interobserver reliability for JSW (0.88-0.96) and femoral head diameter (0.74-0.96).
- Measurements by senior radiologists and rheumatologists showed the highest reliability.
Conclusions:
- The electronic caliper technique provides accurate and reproducible JSW measurements in hip OA.
- This method is simple and suitable for routine clinical evaluation.
- Further validation with serial radiographs is recommended.