RESUMEN
PURPOSE: Verify if the use of locking plates in displaced three- and four-part proximal humerus fractures has meant an improvement even in patients over 70 years of age. MATERIAL AND METHODS: We performed surgery with locking plate fixation in 56 consecutive patients with three- and four-part proximal humerus fractures according to Neer's classification between 1/1/15 and 12/31/20 at our Hospital. Patient satisfaction, quality of life, functionality and radiological variables, as well as the comparison between patients older and younger than 70 years were the main outcomes. Likewise, factors and complications that may have influenced these variables were analyzed as secondary outcomes. The analysis of all these variables was performed after a minimum follow-up time of 24 months after surgery. RESULTS: 51 patients (92%) ended up satisfied or very satisfied according to the SF-36 test and with no disability or mild disability according to the DASH Score questionnaire. 46 patients (82%) obtained a satisfactory or excellent result according to the Neer scale modified by Cofield and 38 (68%) a good or excellent function according to the Constant Murley questionnaire. In 47 cases (84%) good radiological alignment was observed. Complications occurred in 20 patients (36%). The complications and the results of the SF-36, DASH Score, Neer scale modified by Cofield and Constant Murley tests depended on the radiological alignment (p = 0.009, p = 0.006, p = 0.025, p = 0.0008 and p = 0.0004). There were 37 patients younger than 70 years and 19 older than 70 years with no statistically significant differences when comparing the two groups. CONCLUSIONS: This study demonstrates that satisfactory results can be obtained with osteosynthesis with locking plates in displaced proximal humerus fractures even in patients older than 70 years of age. LEVEL OF EVIDENCE III: Retrospective Cohort, Treatment Study.