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Osteoporosis International

, Volume 18, Issue 8, pp 1119–1126 | Cite as

Correlation of plain radiographic indices of the hip with quantitative bone mineral density

  • A. P. Sah
  • T. S. Thornhill
  • M. S. LeBoff
  • J. GlowackiEmail author
Original Article

Abstract

Summary

Radiographic parameters of the hip can be useful as an indication of bone mineral density at the femoral neck. Measurements available from routine hip radiographs were correlated with DXA values. Although radiographs are not a test for osteoporosis, measurements of cortical thickness provide information useful for referral for osteoporosis assessment.

Introduction

Plain hip radiographs are widely used for evaluation of hip pathology in osteoarthritis. A purpose of this study was to determine whether there are relationships between radiographic parameters of bone structure and bone mineral density T-scores, as assessed by dual energy x-ray absorptiometry (DXA).

Methods

Pre-operative radiographs of 32 postmenopausal, osteoarthritic women undergoing hip arthroplasty were evaluated. Radiographic parameters including the Singh index, Dorr classification, canal-to-calcar ratio, and cortical thickness indices (CTI) were measured and compared with T-score, serum 25 hydroxyvitamin D levels, body mass index (BMI), and body weight.

Results

The T-score at the femoral neck for type C bone was significantly lower than that of type A (p = 0.041). The CTIs were correlated positively with T-scores for anteroposterior radiographs (r = 0.5814, p = 0.0005), and for lateral radiographs (r = 0.571, p = 0.0006). A threshold for lateral CTI set at a value of ≤0.40 results in sensitivity of 0.85 and specificity of 0.79 to segregate the osteoporotic and non-osteoporotic patients.

Conclusion

Femurs with small radiographic cortical thickness indices had lower T-scores. Finding a radiographic hip cortical thickness index (LAT) with a value of ≤0.40 should be an alert for referral for osteoporosis evaluation and bone mineral density testing.

Keywords

Bone density Cortical thickness Femoral geometry Osteoarthritis Osteoporosis Radiographs 

Notes

Acknowledgements

The authors appreciate the suggestions made by Drs. Carl Winalski, Department of Radiology, and Jeffrey N. Katz, Division of Rheumatology, Brigham and Women’s Hospital, who pre-reviewed this manuscript. Elena Losina, Ph.D., BWH Orthopedics and Arthritis Center for Outcomes Research, assisted with the analysis of discriminatory power. The original study was supported in part by grants from the NIH.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2007

Authors and Affiliations

  • A. P. Sah
    • 1
  • T. S. Thornhill
    • 1
  • M. S. LeBoff
    • 2
  • J. Glowacki
    • 1
    • 3
    Email author
  1. 1.Department of Orthopedic SurgeryBrigham & Women’s HospitalBostonUSA
  2. 2.Department of MedicineBrigham & Women’s HospitalBostonUSA
  3. 3.Orthopedic ResearchBrigham & Women’s HospitalBostonUSA

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