Fracture of patella - classification of pattelar fractures

Patellar fractures are classified into six basic typech. Each type can be either displaced or undisplaced.

Type Subtype
Transverse
  • displaced
  • undisplaced
Vertical
Lower pole (or upper pole)
Comminuted
Osteochondral

References:

1. Tandeter HB, Shvartzman P. Acute knee injuries: use of decision rules for selective radiograph ordering. Am Fam Physician. 1999 Dec;60(9):2599–608.
2. Hohl M, Johnson EE, Wiss DA. Fractures of the knee, in Rockwood CA Jr, Green DP, Bucholz RW (eds): Fractures in Adults, 3d ed, vol. 2. Philadelphia, Lippincott, 1991, p. 1765

3. Pailo AF, Malavolta EA, Santos ALG dos, Mendes MTR, Rezende MU de, Hernandez AJ, et al. Patellar fractures: a decade of treatment at IOT-HC-FMUSP - part I: functional analysis. Acta Ortopédica Brasileira. 2005 Jan;13(5):221–4.