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Objective: To explore the role of "diagonal principle" surgical technique in the treatment of elderly femoral intertrochanteric fractures. Methods: From October 2015 to February 2018, we treated 28 cases of femoral intertrochanteric fractures (8 cases of AO / OTA classification 31A1 type, 12 cases of 31A2 type, and 8 cases of 31A3 type), and they all received extended pith internal nail (length ≥340mm) internal fixation surgery. Results: Hip function scores were excellent in 18 cases, good in 7doi:10.21203/rs.3.rs-78853/v1 fatcat:ihtdyxkbhjd6rahv47rykplp64