We have located links that may give you full text access.
How is hip prosthesis and proximal femoral nail stability affected by lesser trochanter fractures: A comparative finite element analysis.
Joint Diseases & related Surgery 2018 August
OBJECTIVES: This study aims to evaluate the effects of lesser trochanter (LT) and iliopsoas tendon on implant stability by using finite element analysis (FEA).
MATERIALS AND METHODS: Effects of iliacus and psoas major muscles on hip joint was evaluated with inverse dynamics methods to calculate joint reaction and muscle forces. Intertrochanteric femur fracture was simulated according to AO (Arbeitsgemeinschaft für Osteosynthesefragen) 31A1 and 31A2 classifications in three-dimensional modelling software. Uncemented three-dimensional model of modular nail prosthesis combination was used in FEA. All analyses were performed with Ti6Al4V's 114 GPa elastic modulus value. Effects of LT on implant stability were evaluated with two different implant designs using the same femoral stems and four different femoral models, two of which with intact LT and two of which with fractured LT.
RESULTS: Reaction forces of the hip joint decreased by 10% in the 0-40° hip flexion range. Maximum stress distribution for proximal femoral nail (PFN) model with fractured LT was 204.68 MPa at the distal locking screw on the interconnection point of PFN, while it was 335.35 MPa for the hip prosthesis with fractured LT. The direction of stress distribution for PFN model with fractured LT varied from medial to lateral and anterior to posterior. Maximum stress distribution for the hip prosthesis model with intact LT was 357.42 MPa, with direction of stress distribution from lateral to medial and posterior to anterior.
CONCLUSION: Hip prosthesis models with intact or fractured LT were similar in terms of stress distribution and deformation values, while there were differences between PFN models with intact or fractured LT. Thus, intact LT was significant in PFN implant stability. Further clinical and experimental analyses are necessary on this topic.
MATERIALS AND METHODS: Effects of iliacus and psoas major muscles on hip joint was evaluated with inverse dynamics methods to calculate joint reaction and muscle forces. Intertrochanteric femur fracture was simulated according to AO (Arbeitsgemeinschaft für Osteosynthesefragen) 31A1 and 31A2 classifications in three-dimensional modelling software. Uncemented three-dimensional model of modular nail prosthesis combination was used in FEA. All analyses were performed with Ti6Al4V's 114 GPa elastic modulus value. Effects of LT on implant stability were evaluated with two different implant designs using the same femoral stems and four different femoral models, two of which with intact LT and two of which with fractured LT.
RESULTS: Reaction forces of the hip joint decreased by 10% in the 0-40° hip flexion range. Maximum stress distribution for proximal femoral nail (PFN) model with fractured LT was 204.68 MPa at the distal locking screw on the interconnection point of PFN, while it was 335.35 MPa for the hip prosthesis with fractured LT. The direction of stress distribution for PFN model with fractured LT varied from medial to lateral and anterior to posterior. Maximum stress distribution for the hip prosthesis model with intact LT was 357.42 MPa, with direction of stress distribution from lateral to medial and posterior to anterior.
CONCLUSION: Hip prosthesis models with intact or fractured LT were similar in terms of stress distribution and deformation values, while there were differences between PFN models with intact or fractured LT. Thus, intact LT was significant in PFN implant stability. Further clinical and experimental analyses are necessary on this topic.
Full text links
Related Resources
Trending Papers
Challenges in Septic Shock: From New Hemodynamics to Blood Purification Therapies.Journal of Personalized Medicine 2024 Februrary 4
Molecular Targets of Novel Therapeutics for Diabetic Kidney Disease: A New Era of Nephroprotection.International Journal of Molecular Sciences 2024 April 4
The 'Ten Commandments' for the 2023 European Society of Cardiology guidelines for the management of endocarditis.European Heart Journal 2024 April 18
A Guide to the Use of Vasopressors and Inotropes for Patients in Shock.Journal of Intensive Care Medicine 2024 April 14
Diagnosis and Management of Cardiac Sarcoidosis: A Scientific Statement From the American Heart Association.Circulation 2024 April 19
Essential thrombocythaemia: A contemporary approach with new drugs on the horizon.British Journal of Haematology 2024 April 9
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app