Discrepancies in CPAK classification between CT and long-leg radiography: a systematic review and meta-analysis.
Tao Bian, Yunfeng Zhang, Lei Li et al.
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In 30 seconds
This systematic review and meta-analysis evaluated discrepancies in coronal plane alignment classifications of the knee between CT and long-leg radiography in patients with osteoarthritis. The analysis included four studies with 1,134 knees. CT-derived classifications showed a 10% increase in type I phenotypes and significant reductions in medial proximal tibial angle, hip-knee-ankle angle, and joint line obliquity compared to long-leg radiography.
Key findings
- CT-derived classification increased type I phenotypes by 10% compared to long-leg radiography (P = 0.040).
- CT decreased type III phenotypes by 4% (P = 0.020) and type V phenotypes by 4% (P = 0.004).
- CT yielded a significantly lower medial proximal tibial angle by 1.18° (P < 0.001).
- CT showed a reduction in joint line obliquity by 1.40° (P < 0.001).
Why it matters
Understanding the discrepancies in knee alignment classifications between imaging modalities is crucial for orthopedic surgeons. Accurate classification impacts treatment decisions and surgical planning, particularly in osteoarthritis management.