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

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

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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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.
Transcribed Image Text: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
Transcribed Image Text: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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