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Finite element study of trochanteric gamma nail for trochanteric fracture

Fig. 1: Trochanteric Gamma Nail

 

A three-dimensional finite element study of trochanteric fracture fixation by a trochanteric gamma nail (TGN, Stryker-Howmedica-Osteonics) was investigated. A TGN is used for fracture fixation in Trochanteric and Subtrochanteric fractures.

 

 

The analyses were performed under one-legged stance load boundary conditions to study the stress distribution and displacements.

 

     
 

 

Fig. 2: Starting from CT images, parametric CAD models were derived

 

Fig. 3(a): Virtual Insertion and reaming

1. Align distal nail axis with proximal shaft axis.

2. Translate TGN until lag screw passing through the Z level of   femoral head center.

3. Rotate TGN until lag screw passing through femoral head center.

4. Translate forward/backward until the tip of lag screw far away from femoral head boundary 10 mm.

 

Fig. 3(b): Virtual Insertion and reaming

Fig. 3(c): Virtual Insertion and reaming

Fig. 4(a): Finite Element Model (FEM)

Fig. 4(b): Finite Element Model (FEM)

 

 

 

 

Mesh generation in MSC Patran
10-noded tetrahedral elements
Coincident nodes and elements
Pre and Post processing in MSC Marc
Single-legged stance loading
Assign different material properties for trabecular bone, cortical bone, implant material
Non-linear contact analysis

 

Fig. 5: Finite Element Analysis (FEA)

The influence of material properties (E-modulus) of the implant, the bone and contract condition in the fracture zone was determined. The results show that the stresses in the implant were lower in case of titanium implant material but at the same time higher displacements occurred. The results also indicate that the stresses in the TGN gradually reduced throughout the healing process of the bone in the fracture zone.

 

References

 

K. Sitthiseripratip a,b,*, H.V. Oosterwyck b, J.V. Sloten b, B. Mahaisavariya c, E.L.J. Bohez a, J. Suwanprateeb d, R.V. Audenkercke b, P. Oris a,b

aIndustrial Systems Engineering, Asian Institute of Technology, Pathumtani, Thailand
bBiomechanics and Engineering Design, Katholieke Universiteit Leuven, Leuven, Belgium
cFaculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
dNational Metal and Materials Technology Center, Bangkok, Thailand

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