A total hip replacement consisting of a 28 mm diameter Co-Cr femoral head articulatingagainst a UHMWPE cup functions in a patient for 5 years before it is removed during revision arthroplasty. You perform a detailed analysis of theexplanted cup. The articular surface of the explanted UHMWPE cup shows a change in geometry such that the cup is 0.75 mm deeper (see photo).Radiograph of THR at the time of surgeryAssumptions:28 mmPatient weighs 70kg with an average load of a gate cycle of 2.5BWNeglect creep for all questionsAssume 1 million steps per yearANSWER COLUMNTHR at day 1QUESTIONS0.75 mmTHR at 5 yearsTotal angular motion per gait stride (hip flexion-extension-flexion OR heel strike to heel strike) is 80 degreesHint: Recall details of UHMWPE materials and applications in THR from Lecture 9 Notes.UHMWPE after 5 yearsshowing progression ofworn region (dark grey)Q1B: Calculate the number of wear particles produced per year, assuming spherical UHMWPE particles of5 micrometers in diameter. PolyethyleneDebris particle size▪ 0.1-0.5 μm²6▪ 0.69 μm³3Wear rate▪ 0.04-0.26 mm per year³4■ Non-crossed-linked polyethylene: 39 mm³ per 106cycles (simulator) 35. Cross-linked polyethylene: 5-9 mm³ per 106 cycles(simulator)35

Total hip replacement (THA), commonly known as total hip arthroplasty (THA), is one of the most…

Answered: Q1B: Calculate the number of wear…

Q1B: Calculate the number of wear particles produced per year, assuming spherical UHMWPE particles of 5 micrometers in diameter.

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter9: Joints

Section: Chapter Questions

Problem 2ILQ: Watch this video (http://openstaxcollege.org/l/synjoints) to see an animation of synovial joints in...

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Question

A total hip replacement consisting of a 28 mm diameter Co-Cr femoral head articulating
against a UHMWPE cup functions in a patient for 5 years before it is removed during revision arthroplasty. You perform a detailed analysis of the
explanted cup. The articular surface of the explanted UHMWPE cup shows a change in geometry such that the cup is 0.75 mm deeper (see photo).
Radiograph of THR at the time of surgery
Assumptions:
28 mm
Patient weighs 70kg with an average load of a gate cycle of 2.5BW
Neglect creep for all questions
Assume 1 million steps per year
ANSWER COLUMN
THR at day 1
QUESTIONS
0.75 mm
THR at 5 years
Total angular motion per gait stride (hip flexion-extension-flexion OR heel strike to heel strike) is 80 degrees
Hint: Recall details of UHMWPE materials and applications in THR from Lecture 9 Notes.
UHMWPE after 5 years
showing progression of
worn region (dark grey)
Q1B: Calculate the number of wear particles produced per year, assuming spherical UHMWPE particles of
5 micrometers in diameter.

Polyethylene
Debris particle size
▪ 0.1-0.5 μm²6
▪ 0.69 μm³3
Wear rate
▪ 0.04-0.26 mm per year³4
■ Non-crossed-linked polyethylene: 39 mm³ per 106
cycles (simulator) 35
. Cross-linked polyethylene: 5-9 mm³ per 106 cycles
(simulator)35

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