Experimental testing of a DEXA-derived curved beam model of the proximal femur

T. J. Beck, F. A. Mourtada, Christopher B Ruff, Jr Scott W.W., G. Kao

Research output: Contribution to journalArticle

Abstract

This study was designed to test whether, using curved beam theory, a structural model of the proximal femur derived from two-dimensional dual energy x-ray absorptiometry could be used to predict femoral strength in an experimental simulation of a fall on the greater trochanter. A set of 22 fresh cadaveric femoral specimens were scanned with use of two-dimensional dual energy x-ray absorptiometry and then were tested to failure in a materials testing system, under three-point loading, with the ground impact vector aligned within the plane and along the bisector of the femoral neck- shaft angle. Failure locations generally corresponded to stress peak locations predicted by the curved beam model. Predicted failure loads correlated well with measured failure loads for femoral neck fractures (r = 0.89; percent SE of estimate = 23%) and somewhat less well for intertrochanteric fractures (r = 0.83; percent SE of estimate = 29%). Overall predictions for failure load calculated from the maximum stress peak value over both locations corresponded to measured failure loads with an r value of 0.91 (percent SE of estimate = 21%). This kind of structural approach to the analysis of data for hip bone mass has the potential to provide mechanistic interpretations of the statistical associations frequently shown between conventional bone mineral measures and either hip fracture risk in vivo or bone strength in vitro.

Original languageEnglish (US)
Pages (from-to)394-398
Number of pages5
JournalJournal of Orthopaedic Research
Volume16
Issue number3
DOIs
StatePublished - May 1998

Fingerprint

Hip Fractures
Thigh
Femur
X-Rays
Pelvic Bones
Materials Testing
Bone and Bones
Femoral Neck Fractures
Structural Models
Femur Neck
Minerals
In Vitro Techniques

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Experimental testing of a DEXA-derived curved beam model of the proximal femur. / Beck, T. J.; Mourtada, F. A.; Ruff, Christopher B; Scott W.W., Jr; Kao, G.

In: Journal of Orthopaedic Research, Vol. 16, No. 3, 05.1998, p. 394-398.

Research output: Contribution to journalArticle

Beck, T. J. ; Mourtada, F. A. ; Ruff, Christopher B ; Scott W.W., Jr ; Kao, G. / Experimental testing of a DEXA-derived curved beam model of the proximal femur. In: Journal of Orthopaedic Research. 1998 ; Vol. 16, No. 3. pp. 394-398.
@article{58c623621f974cc2bfa3562a786036a2,
title = "Experimental testing of a DEXA-derived curved beam model of the proximal femur",
abstract = "This study was designed to test whether, using curved beam theory, a structural model of the proximal femur derived from two-dimensional dual energy x-ray absorptiometry could be used to predict femoral strength in an experimental simulation of a fall on the greater trochanter. A set of 22 fresh cadaveric femoral specimens were scanned with use of two-dimensional dual energy x-ray absorptiometry and then were tested to failure in a materials testing system, under three-point loading, with the ground impact vector aligned within the plane and along the bisector of the femoral neck- shaft angle. Failure locations generally corresponded to stress peak locations predicted by the curved beam model. Predicted failure loads correlated well with measured failure loads for femoral neck fractures (r = 0.89; percent SE of estimate = 23{\%}) and somewhat less well for intertrochanteric fractures (r = 0.83; percent SE of estimate = 29{\%}). Overall predictions for failure load calculated from the maximum stress peak value over both locations corresponded to measured failure loads with an r value of 0.91 (percent SE of estimate = 21{\%}). This kind of structural approach to the analysis of data for hip bone mass has the potential to provide mechanistic interpretations of the statistical associations frequently shown between conventional bone mineral measures and either hip fracture risk in vivo or bone strength in vitro.",
author = "Beck, {T. J.} and Mourtada, {F. A.} and Ruff, {Christopher B} and {Scott W.W.}, Jr and G. Kao",
year = "1998",
month = "5",
doi = "10.1002/jor.1100160317",
language = "English (US)",
volume = "16",
pages = "394--398",
journal = "Journal of Orthopaedic Research",
issn = "0736-0266",
publisher = "John Wiley and Sons Inc.",
number = "3",

}

TY - JOUR

T1 - Experimental testing of a DEXA-derived curved beam model of the proximal femur

AU - Beck, T. J.

AU - Mourtada, F. A.

AU - Ruff, Christopher B

AU - Scott W.W., Jr

AU - Kao, G.

PY - 1998/5

Y1 - 1998/5

N2 - This study was designed to test whether, using curved beam theory, a structural model of the proximal femur derived from two-dimensional dual energy x-ray absorptiometry could be used to predict femoral strength in an experimental simulation of a fall on the greater trochanter. A set of 22 fresh cadaveric femoral specimens were scanned with use of two-dimensional dual energy x-ray absorptiometry and then were tested to failure in a materials testing system, under three-point loading, with the ground impact vector aligned within the plane and along the bisector of the femoral neck- shaft angle. Failure locations generally corresponded to stress peak locations predicted by the curved beam model. Predicted failure loads correlated well with measured failure loads for femoral neck fractures (r = 0.89; percent SE of estimate = 23%) and somewhat less well for intertrochanteric fractures (r = 0.83; percent SE of estimate = 29%). Overall predictions for failure load calculated from the maximum stress peak value over both locations corresponded to measured failure loads with an r value of 0.91 (percent SE of estimate = 21%). This kind of structural approach to the analysis of data for hip bone mass has the potential to provide mechanistic interpretations of the statistical associations frequently shown between conventional bone mineral measures and either hip fracture risk in vivo or bone strength in vitro.

AB - This study was designed to test whether, using curved beam theory, a structural model of the proximal femur derived from two-dimensional dual energy x-ray absorptiometry could be used to predict femoral strength in an experimental simulation of a fall on the greater trochanter. A set of 22 fresh cadaveric femoral specimens were scanned with use of two-dimensional dual energy x-ray absorptiometry and then were tested to failure in a materials testing system, under three-point loading, with the ground impact vector aligned within the plane and along the bisector of the femoral neck- shaft angle. Failure locations generally corresponded to stress peak locations predicted by the curved beam model. Predicted failure loads correlated well with measured failure loads for femoral neck fractures (r = 0.89; percent SE of estimate = 23%) and somewhat less well for intertrochanteric fractures (r = 0.83; percent SE of estimate = 29%). Overall predictions for failure load calculated from the maximum stress peak value over both locations corresponded to measured failure loads with an r value of 0.91 (percent SE of estimate = 21%). This kind of structural approach to the analysis of data for hip bone mass has the potential to provide mechanistic interpretations of the statistical associations frequently shown between conventional bone mineral measures and either hip fracture risk in vivo or bone strength in vitro.

UR - http://www.scopus.com/inward/record.url?scp=0032078470&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032078470&partnerID=8YFLogxK

U2 - 10.1002/jor.1100160317

DO - 10.1002/jor.1100160317

M3 - Article

C2 - 9671936

AN - SCOPUS:0032078470

VL - 16

SP - 394

EP - 398

JO - Journal of Orthopaedic Research

JF - Journal of Orthopaedic Research

SN - 0736-0266

IS - 3

ER -