Non-union and delayed non-union in patella fractures are very uncommon. The main goal in treat-ment of the neglected, delayed or non-union of patellar fracture is restoring the extensor mechanism and improving the functional capacity. There is no standard treatment method since non-union is scarce. Teratment strategy is based on the patients expectation, the reason for nonunion and previ-ous surgery. Conservative treatment can be the first option for low demanding patients with low func-tional capacity, while surgery can be the choice for high demanding patients with high functional capaci- ty. Open reduction and internal fixation is the most common method of choice. Partial patellectomy can be performed in multifragmental and upper pole fractures taking into consideration the biome-chanic effects of patellectomy. For the neglected and displaced fractures with a gap which could not be fixed primarly, two staged surgery or quadriceps lengthening can be the choice for treatment.