The answer behind the PFNA 'cut through' phenomenon

Cut-through failure is a perplexing phenomenon that is becoming more common in the treatment of intertrochanteric hip fractures with the PFNA implant. The goal of this study is to conduct a biomechanical investigation into the role of bi-directional cyclic loading on the cut-through phenomenon. Saw...

Full description

Saved in:
Bibliographic Details
Main Author: Tan, Li Jin
Other Authors: Chou Siaw Meng
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2022
Subjects:
Online Access:https://hdl.handle.net/10356/157618
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-157618
record_format dspace
spelling sg-ntu-dr.10356-1576182023-03-04T20:20:50Z The answer behind the PFNA 'cut through' phenomenon Tan, Li Jin Chou Siaw Meng School of Mechanical and Aerospace Engineering MSMCHOU@ntu.edu.sg Engineering::Mechanical engineering Cut-through failure is a perplexing phenomenon that is becoming more common in the treatment of intertrochanteric hip fractures with the PFNA implant. The goal of this study is to conduct a biomechanical investigation into the role of bi-directional cyclic loading on the cut-through phenomenon. Sawbones’ low density polyurethane foam proximal femur models, Synthes PFNA implants, and a customised fixation equipment set were used to create the bone-implant construct for testing. The fixture for the bi-directional cyclic load, as well as the base fixture for securing the construct to the Shimadzu Universal Testing Machine 10kN were created specifically for this investigation. In each synthetic bone, a stable intertrochanteric fracture (AO31-A1) was simulated. Bi-directional Cyclic loading of 720 N compression and 120 N tension were utilized to mimic the gait cycle of a human femur. A break on the femoral head indicated that the helical blade had cut axially through the femoral head and reached the cortical bone, indicating a cut-through failure. Four femur bones were used. The number of cycles it takes for each bone to fail was recorded. All bones showed consistent reproduction of the medial migration. An analysis of how the bone failed were recorded and discussed in report. The objective of this research is to perform a controlled biomechanical investigation to determine why and how ‘cut throughs' occur in the PFNA implant. Bachelor of Engineering (Mechanical Engineering) 2022-05-21T08:17:00Z 2022-05-21T08:17:00Z 2022 Final Year Project (FYP) Tan, L. J. (2022). The answer behind the PFNA 'cut through' phenomenon. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/157618 https://hdl.handle.net/10356/157618 en B061 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
spellingShingle Engineering::Mechanical engineering
Tan, Li Jin
The answer behind the PFNA 'cut through' phenomenon
description Cut-through failure is a perplexing phenomenon that is becoming more common in the treatment of intertrochanteric hip fractures with the PFNA implant. The goal of this study is to conduct a biomechanical investigation into the role of bi-directional cyclic loading on the cut-through phenomenon. Sawbones’ low density polyurethane foam proximal femur models, Synthes PFNA implants, and a customised fixation equipment set were used to create the bone-implant construct for testing. The fixture for the bi-directional cyclic load, as well as the base fixture for securing the construct to the Shimadzu Universal Testing Machine 10kN were created specifically for this investigation. In each synthetic bone, a stable intertrochanteric fracture (AO31-A1) was simulated. Bi-directional Cyclic loading of 720 N compression and 120 N tension were utilized to mimic the gait cycle of a human femur. A break on the femoral head indicated that the helical blade had cut axially through the femoral head and reached the cortical bone, indicating a cut-through failure. Four femur bones were used. The number of cycles it takes for each bone to fail was recorded. All bones showed consistent reproduction of the medial migration. An analysis of how the bone failed were recorded and discussed in report. The objective of this research is to perform a controlled biomechanical investigation to determine why and how ‘cut throughs' occur in the PFNA implant.
author2 Chou Siaw Meng
author_facet Chou Siaw Meng
Tan, Li Jin
format Final Year Project
author Tan, Li Jin
author_sort Tan, Li Jin
title The answer behind the PFNA 'cut through' phenomenon
title_short The answer behind the PFNA 'cut through' phenomenon
title_full The answer behind the PFNA 'cut through' phenomenon
title_fullStr The answer behind the PFNA 'cut through' phenomenon
title_full_unstemmed The answer behind the PFNA 'cut through' phenomenon
title_sort answer behind the pfna 'cut through' phenomenon
publisher Nanyang Technological University
publishDate 2022
url https://hdl.handle.net/10356/157618
_version_ 1759853502908071936