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Radiographic grading for knee osteoarthritis. A revised scheme that relates to alignment and deformity.
1Department of Orthopaedics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
The Journal of Rheumatology
|March 25, 1999
Summary
A new radiographic grading scheme for knee osteoarthritis demonstrates excellent reliability and correlates well with limb alignment, aiding in tracking disease progression and deformity.
Area of Science:
- Orthopedics
- Radiology
- Rheumatology
Background:
- Osteoarthritis (OA) of the knee is a significant cause of disability.
- Accurate radiographic assessment is crucial for understanding OA progression and deformity.
Purpose of the Study:
- To develop and validate a revised radiographic grading scheme for knee osteoarthritis.
- The scheme aims to correlate with disease progression and joint deformity.
Main Methods:
- The grading scheme was revised from Scott et al., incorporating Tibial Erosion and Subluxation, and excluding Tibial Osteophytes and Sclerosis.
- Scoring was performed on frontal Standardized Knee Images, focusing on the most affected compartment.
- Knee alignment variables were defined using these images.
Main Results:
- The revised grading scheme showed excellent interreader reliability (kappa = 0.92) and total score correlation (r = 0.94).
- Individual and total knee scores demonstrated strong correlations with limb alignment variables, notably the hip-knee-ankle angle (r = 0.77).
Conclusions:
- The developed radiographic grading scheme is reliable and correlates with key alignment parameters.
- Further evaluation is warranted for its use in outcome measurement and assessing arthritic changes over time.