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Technical Brief

A Computational Analysis of Squeaking Hip Prostheses

[+] Author and Article Information
Ehsan Askari

Australian School of Advanced Medicine,
Macquarie University,
Sydney, NSW 2109, Australia
Department of Mechanical Engineering,
School of Engineering,
University of Minho,
Braga P-4704-553, Portugal
e-mail: ehsanaskary@gmail.com

Paulo Flores

Department of Mechanical Engineering,
School of Engineering,
University of Minho,
Braga P-4704-553, Portugal

Danè Dabirrahmani, Richard Appleyard

Australian School of Advanced Medicine,
Macquarie University,
Sydney NSW 2109, Australia

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received November 9, 2013; final manuscript received July 27, 2014; published online January 12, 2015. Assoc. Editor: Tae-Won Park.

J. Comput. Nonlinear Dynam 10(2), 024502 (Mar 01, 2015) (7 pages) Paper No: CND-13-1273; doi: 10.1115/1.4028109 History: Received November 09, 2013; Revised July 27, 2014; Online January 12, 2015

A ceramic-on-ceramic (CoC) hip prosthesis with clearance is modeled as a multibody dynamics system for the purpose of studying hip squeaking. A continuous contact force model provides the intrajoint forces developed at the hip joint. Friction effects due to the relative motion are also considered. A FFT analysis of the audible sounds from CoC hip acceleration is carried out to analyze hip squeaking. The effects of friction, hip implant size, and the head initial position on hip squeaking and the trajectory of femoral head are analyzed and discussed. It was shown that the causes of hip squeaking are stick/slip, friction-induced vibration, and the femoral head angular speed and force changes.

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References

Figures

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Fig. 1

A schematic representation of the head and liner in contact

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Fig. 2

Stribeck characteristic for dry friction [8]

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Fig. 3

The head trajectory for initial condition of (0, 0.0499) mm and different cup radii: (a) 25, (b) 20, (c) 16, and (d) 14 mm

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Fig. 4

FFT analysis with the head initial condition of (0, 0.0499) mm for different cup radii: (a) 25, (640, 1360−1600, 2250, 3200 Hz), (b) 20, (1000, 2000−2200, 3100, 4420 Hz), (c) 16, (1400, 2800−3100, 4330, 6200 Hz), and (d) 14 mm, (1700, 3400−3800, 5250, 7300 Hz)

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Fig. 5

The head trajectory for different initial conditions: (a) (0, 0.0499), (b) (0.01, 0.0489), (c) (0, 0.02), and (d) (0.0489, 0.01) mm

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Fig. 6

The head trajectory with the initial condition of (0, 0.0499) mm: (a) II and (b) I. FFT analysis of hip implants (c) II and (d) I (I: Cf/Cd = 0.15/0.1, II: Cf/Cd = 0.00015/0.0001).

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Fig. 7

Stick/slip phase intervals over the gait cycle

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Fig. 8

Phase portrait diagrams for different clearance sizes: (a) 0.1, (b) 0.05, and (c) 0.02 mm

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Fig. 9

Penetration acceleration versus velocity: (a) I and (b) II. Vertical acceleration versus velocity, (c) I and (d) II. Horizontal acceleration versus velocity (e) I and (f) II (I: Cf/Cd = 0.15/0.1, II: Cf/Cd = 0.00015/0.0001).

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Fig. 10

Phase portrait diagrams for different initial conditions: (a) (0, 0.0499), (b) (0.01, 0.0489), (c) (0, 0.02), and (d) (0.0489, 0.01) mm

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