Table 1.

Incidence of patella fracture nonunion and delayed union

Author	Year	Number of patients	Nonunion and delayed union
Sorensen [11]	1964	64	8 (12.5%)
Nummi [10]	1971	355	17 (4.78%)
Bostrom [6]	1974	246	21 (8.54%)
Torchia and Lewallen [5]	1995	28	2 (7.14%)
Klassen and Trousdale [1]	1997	736	20 (2.7%)
Mehdi et al. [12]	1999	203	8 ( 4%)
Uvaraj et al. [4]	2007	88	22 (25%)