9. Zimmermann EA, Busse B, Ritchie RO: The fracture mechanics of human bone: influence of disease and treatment. Bonekey Rep 2015; 4: 743

10. Burstein AH, Reilly DT, Martens M: Aging of bone tissue: mechanical properties. J Bone Joint Surg Am 1976; 58: 82–86

11. Zioupos P, Currey JD. Changes in the stiffness, strength, and toughness of human cortical bone with age. Bone 1998; 22: 57–66

12. McCalden RW, McGeough JA, Court-Brown CM: Age-related changes in the compressive strength of cancellous bone. The relative importance of changes in density and trabecular architecture. J Bone Joint Surg Am 1997; 79: 421–427

13. van den Kroonenberg AJ, Hayes WC, McMahon TA: Hip impact velocities and body configurations for voluntary falls from standing height. J Biomech 1996; 29: 807–811

14. von Rüden C, Augat P: Failure of fracture fixation in osteoporotic bone. Injury 2016; 47 Suppl 2: S3–S10

15. Cummings SR, Melton LJ: Epidemiology and outcomes of osteoporotic fractures. Lancet 2002; 359: 1761–1767

16. Cornell CN, Ayalon O: Evidence for success with locking plates for fragility fractures. HSS J 2011; 7: 164–169

17. Augat P, Rapp S, Claes L: A modified hip screw incorporating injected cement for the fixation of osteoporotic trochanteric fractures. J Orthop Trauma 2002; 16: 311–316

18. Konstantinidis L, Papaioannou C, Blanke P, Hirschmuller A, Sudkamp NP, Helwig P: Failure after osteosynthesis of trochanteric fractures. Where is the limit of osteoporosis? Osteoporos Int 2013; 24: 2701–2706

19. Seebeck J, Goldhahn J, Stadele H, Messmer P, Morlock MM, Schneider E: Effect of cortical thickness and cancellous bone density on the holding strength of internal fixator screws. J Orthop Res 2004; 22: 1237–1242

20. Seebeck J, Goldhahn J, Morlock MM, Schneider E: Mechanical behavior of screws in normal and osteoporotic bone. Osteoporos Int 2005; 16 Suppl 2: S107–111

21. Eschler A, Brandt S, Gierer P, Mittlmeier T, Gradl G: Angular stable multiple screw fixation (Targon FN) versus standard SHS for the fixation of femoral neck fractures. Injury 2014; 45 Suppl 1: S76–80

22. Nyholm AM, Palm H, Malchau H, Troelsen A, Gromov K: Lacking evidence for performance of implants used for proximal femoral fractures – a systematic review. Injury 2016; 47(3): 586–594

23. Matre K, Vinje T, Havelin LI, Gjertsen JE, Furnes O, Espehaug B, Kjellevold SH et al.: TRIGEN INTERTAN intramedullary nail versus sliding hip screw: a prospective, randomized multicenter study on pain, function, and complications in 684 patients with an intertrochanteric or subtrochanteric fracture and one year of follow-up. J Bone Joint Surg Am 2013; 95: 200–208

24. Ruecker AH, Rupprecht M, Gruber M, Gebauer M, Barvencik F, Briem D, Rueger JM: The treatment of intertrochanteric fractures: results using an intramedullary nail with integrated cephalocervical screws and linear compression. J Orthop Trauma 2009; 23: 22–30

25. Valverde JA, Alonso MG, Porro JG, Rueda D, Larrauri PM, Soler JJ: Use of the gamma nail in the treatment of fractures of the proximal femur. Clin Orthop Relat Res 1998; 350: 56–61

26. Yeganeh A, Taghavi R, Moghtadaei M: Comparing the Intramedullary Nailing Method Versus Dynamic Hip Screw in Treatment of Unstable Intertrochanteric Fractures. Med Arch 2016; 70(1): 53–56

27. Weiser L, Ruppel AA, Nüchtern JV, Sellenschloh K, Zeichen J, Püschel K, Morlock MM et al.: Extra- vs. intramedullary treatment of pertrochanteric fractures: a biomechanical in vitro study comparing dynamic hip screw and intramedullary nail. Arch Orthop Trauma Surg 2015; 135(8): 1101–1106

28. Zehir S, Zehir R, Zehir S, Azboy I, Haykir N: Proximal femoral nail antirotation against dynamic hip screw for unstable trochanteric fractures; a prospective randomized comparison. Eur J Trauma Emerg Surg 2015; 41(4): 393–400

29. von Rüden C, Hungerer S, Augat P, Trapp O, Bühren V, Hierholzer C: Breakage of cephalomedullary nailing in operative treatment of trochanteric and subtrochanteric femoral fractures. Arch Orthop Trauma Surg 2015; 135: 179–185

30. Harris WH: Traumatic arthritis of the hip after dislocation and acetabular fractures: treatment by mold arthroplasty. An end-result study using a new method of result evaluation. J Bone Joint Surg Am 1969; 51(4): 737–755

31. Verettas DA, Ifantidis P, Chatzipapas CN, Drosos GI, Xarchas KC, Chloropoulou P, Kazakos KI et al.: Systematic effects of surgical treatment of hip fractures: gliding screw-plating vs intramedullary nailing. Injury 2010; 41(3): 279–284

32. Queally JM, Harris E, Handoll HH, Parker MJ: Intramedullary nails for extracapsular hip fractures in adults. Cochrane Database Syst Rev 2014; Sept 12; (9): CD004961

33. Aktselis I, Kokoroghiannis C, Fragkomichalos E, Koundis G, Deligeorgis A, Daskalakis E, Vlamis J et al.: Prospective randomised controlled trial of an intramedullary nail versus a sliding hip screw for intertrochanteric fractures of the femur. Int Orthop 2014; 38(1): 155–161

34. Alvarez DB, Aparicio JP, Fernandez EL, Múgica IG, Batalla DN, Jiménez JP: Implant breakage, a rare complication with the gamma nail. A review of 843 fractures of the proximal femur treated with a gamma nail. Acta Orthop Belg 2004; 70(5): 435–443