髌骨撕脱骨折多发生在髌骨下极,而髌骨上极骨折多见于儿童,临床少见,且易误诊。Grogan等[1]报告的7例髌骨上极撕脱骨折中,延误诊断者达5例。另外,Bishay[2]曾报告1例儿童髌骨上极套状骨折,国内近10年的文献中仅见陈小强等[3]报告的1例儿童髌骨上极套状骨折。我院从1991以来共收 Patellar avulsion fractures occurred in the lower pole of the patella, and the fracture of the patella more common in children, clinically rare, and easily misdiagnosed. Grogan et al [1] reported in 7 cases of maxillary avulsion fracture of the patella, the delay in diagnosis of up to 5 cases. In addition, Bishay [2] reported a case of an extremely set-like fracture of the patella in one child. For the last 10 years, only one case of a maxillary patella fracture in children reported by Chen et al. [3] was reported in the literature. Our hospital since 1991 received a total of