Prevention of Excessive Medialisation of Trochanteric Fracture by a Buttress Screw: A Novel Method and Finite Element Analysis
Banchong Mahaisavariya MD*, Nattapon Chantarapanich PhD**, Kongkhet Riansuwan MD*, Kriskrai Sitthiseripratip DEng***
Affiliation : * Department of Orthopaedic Surgery and Rehabilitation, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand ** Department of Mechanical Engineering, Faculty of Engineering at Si Racha, Kasetsart University, Chonburi, Thailand *** National Metal and Materials Technology Center (MTEC), National Science and Technology, Development Agency, Pathumthani, Thailand
This paper proposes a novel method of using an antero-posterior buttress screw at the distal fragment just below the fracture site in conjunction with the sliding hip screw (SHS) to resist excessive femoral medialisation. A virtual assessment of the effectiveness of this new method was performed using the finite element analysis. The results indicate that the use of a sliding hip screw (SHS) combined with a buttress screw can help resist femoral medialisation better than using an SHS with no buttress screw. The von Mises equivalent stress (EQV) was found to be in a safe range, which indicates increased integrity of the lateral wall with the addition of the buttress screw.
Keywords : Trochanter, Fractures, Hip screw, Dynamic hip screw, Medialization
