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Artificial Hip Implant

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Eng Mohammad Palestino

on 7 June 2014

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Transcript of Artificial Hip Implant

Development of an Adjustable Artificial Hip Implant
Problem Definition
Engineering Design Analysis
Model Development
SolidWorks-2014 was used to develop an Adjustable Femoral Neck model, of multiple fixations, stabled by a pressed pin at the required position, joining the stem, neck, and femur ball.
Design Constraints and Criteria
The main aim of the study is to design an artificial hip implant for old men.
Mohammad Khaleel Saleem Abubasha

QUID: 201003128

Prof. Elsadig Mahdi

Design Varification
To verify the proposed design, the part under study is compared to the original stem without any cuts in it.
Design Optimizations
Safety factor theories:
Brittle: Max Normal stress.
Ductile: Tresca

Titanium Grade 2 (textured) Stem
AISI 304 Stainless steel.
College of Engineering
Mechanical & Industrial Engineering Department

Fatigue Loading Analysis
Labrum tearing & wearing
Why Hip Replacement?
Crippling problem
Post-Operation Problems
Hip Implant Wearing
Metal poisoning (Metallosis) effects organs like liver and kidneys, also brain damage can occur, these MOM hips are life threatening if not taken out in time.

Part Optimization
Component Optimization
Whole Design
Ball Analysis
Adjustable Neck Analysis
Stem Analysis
Ball and Neck
MEETING Dr. Tolessa, E., ORTHO head at Al-Ahli Hospital

Informed about areas of current problems, and Areas of improvement in hip surgeries.

Wearing; Crippling; Toggling.
Adjustable neck
Displacement contours
Stress contours
Safety Factor (MNS) contours
Stress contours
applied load and fixtures position
Displacement contours
SF (MNS) contours
Stress contours
Displacement contours
applied load and fixtures position
SF (MNS) contours
SF (MNS) contours
Displacement contours
Stress contours
SF (MNS) contours
Displacement contours
Stress contours
would allow to define anatomic and geometric constraints, on which the design will be adjusted accordingly.
Adjustable neck
with accurate pin fitting would solve both crippling and toggling problems in implants.
Choice of
stem, Titanium neck and Zirconia Ceramic femur head would account for wearing problem that could poison the human body.

Future work, Struggles and Recommendations
Prof. Elsadig M. Saad
Dr. Tolessa, E.
Engineer: Eead AbdalKader
Engineer: Yehia Elsayed

Design adjustment and modification;
Contact stress analysis;
Finilizing and manufacturing a prototype.

Manufacturability: CNC drill-bits.
Testing Equipments: not available.

Displacement contours
Safety Factor (MNS) contours
Stress contours
Static Analysis
Problem Definition
Design Constraints and Criteria
Engineering Design Analysis
Stress Analysis
Safety Factors
Design Development and Optimization
THR Surgery

Implant Components
Detailed Objectives:
To minimize wearing problem through proper materials selection.

To design an adjustable artificial hip that would withstand different loading conditions and reduce crippling problem.

To develop Finite Element hip implant model in the femoral bone , simulate and perform stress analysis on it.
Senior I
Anatomic constraints resembles in knowing the exact position for implanting: Dr. Tolessa.

Geometrical constraints refers to implant dimensions to suit the patient: Mimics

Hip bone Geometry: average femoral neck bone proximal CS: 40x30 mm;
Current implants weights, about 0.5 kg;
Body weight and reacting forces.
Source: fpnotebook.com
Hip Joint Components
Design shall be:
Withstand different loading conditions.

THR Medical Surgery
Mimics (Materialise)
Using Mimics (DEMO version), the implant could be simulated in an actual femur bone. Below are the steps performed to obtain the bone model.
Thresholding and extracting femur from CT scans
Dimensions Measurement
Implant Simulation
Source: fpnotebook.com
Source: fpnotebook.com
Source: Total Joint Arthroplasty
Bio-compatibility is the main criterion while analyzing the materials.
Principal Stresses Calculation
forces acting on the hip:
Body weight = 850 N
Hip Abductory muscle force:

By INMANRatio is 1.65* Body Weight, for a 90 kg, HAF(average)=150×9.81=1500 N

Static Loading Conditions
Safety Factors
Neck position
Actual Neck Dimensions
Final design
Dr. Daniel Ochoa
"What have been learnt in this part of the Thesis is really appreciable and valuable, and this would not stop until a real valuable and sensed benefit is achieved, patented and introduced to the medical field and humanity."
Materials considered:
Cobalt-Cr Alloy
Full transcript