(Fig 4-B.03) Retropatellar Articular Surface and Wiberg Classification

https://youtu.be/w9ZABNJm5AA

https://youtu.be/w63GyfUeIyw

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📌 The Retropatellar Articular Surface

✅  Components:

• Larger lateral facet
• Median ridge
• Medial facet
• Odd facet (30% of knees) - medial to medial facet

 

1️⃣ Medial Facet:

• Flat or convex shape
• Variable cartilage thickness
• Sometimes divided into medial facet proper and odd facet by vertical ridge

 

2️⃣ Lateral Facet:

• Longer and wider than medial facet
• Concave in vertical and transverse planes

 

3️⃣ Odd Facet:

• Normal variant
• Thin cartilage strip separated from medial facet by ridge
• Articulates with femur only in deep flexion

 

📌  The Wiberg Classification

• Type 1: Both facets gently concave, symmetrical, nearly equal size
• Type 2: Medial facet smaller than lateral facet Medial - flat or convex Lateral - concave Most common (65%)
• Type 3: Medial facet distinctly smaller than lateral facet Marked lateral predominance (25%)
• Type 4: Relative hypoplasia of medial facet

 

References: 

Skeletal Radiology (2019) 48:859–869 

Stoller's Orthopaedics and Sports Medicine: by Stoller MD FACR, David W. LWW, 2016 

Skeletal Radiol. 2018 Aug;47(8):1069-1086 

RadioGraphics 2018; 38:2069–2101

 

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