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📌 Bipartite Patella
- Bipartite patella is a normal variant of the patella where a secondary or accessory ossification center fails to fuse with the main body of the patella.
- It is seen in approximately 2% of the population, and is more often unilateral than bilateral.[1]
📌 Saupe Classification
Bipartite patella is categorized by the Saupe classification based on the location of the accessory ossification center:
1️⃣ Type I
- Located at the inferior patellar pole
- Accounts for 5% of cases
2️⃣ Type II
- Located at the lateral margin
- Accounts for 20% of cases
3️⃣ Type III
- Located at the superolateral pole
- The most common type, accounting for 75% of cases[2]
✅ Etiology
- Failure of coalescence occurs in up to 2% of the population, producing a bipartite patella.
- The accessory ossification center is classically located at the upper outer quadrant.
- This suggests that the failure of fusion is related to chronic excess traction via the vastus lateralis muscle.[3]
References
[1] Skeletal Radiol. 2018 Aug;47(8):1069-1086
[2] Skeletal Radiol. 2018 Aug;47(8):1069-1086
[3] RadioGraphics 2018; 38:2069–2101
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#bipartitepatella, #patella, #ossificationcenter, #saupeclassification, #kneeanatomy, #radiology, #orthopedics, #boneanatomy, #musculoskeletalanatomy,
