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Rainbow’s End

Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

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Page 1: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Rainbow’s End

Page 2: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

The Iowa Total Hip

Page 3: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Radiolucency

Page 4: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Femoral Component

Page 5: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Femoral Head & Neck

Page 6: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

TiBac Cup

Page 7: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

TiBac Cup

Page 8: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Design Parameters

Page 9: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Effects of Stem Length on Peak Stress

Page 10: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Finite Element Model

of Cemented Femoral

Component

Page 11: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

FEA of Femoral Stem

Page 12: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Effects of Valgus Stem-Neck Angle

Page 13: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Critical Stresses for various Cross-Sections

Page 14: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Alternative Stem Cross-Sections

Page 15: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Cross-Sectional Cement Stresses

Page 16: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Interaction of Cup Thickness and Metal Backing

PMMA Stress

Page 17: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Interaction of Cup Thickness and Metal Backing

Trabecular Bone Stress

Page 18: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Interaction of Cup Thickness and Metal Backing

Subchondral Bone Stress

Page 19: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Medial Cement

Lateral Cement

Cement Stress vs. Stem Length

Page 20: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Medial StemLateral Stem

Stem Stress vs. Stem Length

Page 21: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Stem Length

Page 22: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Medial Cement

Lateral Cement

Stem Thickness vs. Cement Stress

Page 23: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Medial Stem

Lateral Stem

Stem Stress vs. Stem Thickness

Page 24: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Cross-Sectional Size

Page 25: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Endurance Limits for Implant Materials

Page 26: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Effects of Femoral Component Modulus

Page 27: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Medial Cement

Lateral CementStem Elastic Modulus

Cement Stress vs. Stem Modulus

Page 28: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Stem Elastic Modulus

Medial Stem

Lateral Stem

Stem Stress vs. Stem Modulus

Page 29: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Elastic Modulus of the Stem

Page 30: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Collarless Collar/Bone Collar/Cement

Effect of Collar Contact

Page 31: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Stresses due to Collar Contact Variants

Page 32: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Range of Sizes

Page 33: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac

Specialty Femoral Components

Page 34: Rainbow’s Enduser.engineering.uiowa.edu/~bme_158/Lecture/drpIowaTotalHip.pdf · Rainbow’s End. The Iowa Total Hip. Radiolucency. Femoral Component. Femoral Head & Neck. TiBac