Prognostic factors associated with a subchondral insufficiency fracture of the femoral head

K. Iwasaki, Takuaki Yamamoto, G. Motomura, S. Ikemura, T. Mawatari, Y. Nakashima, Y. Iwamoto

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Objective: The aim of this study was to identify the risk factors associated with the prognosis of a subchondral insufficiency fracture of the femoral head (SIF). Methods: Between June 2002 and July 2009, 25 patients diagnosed with SIF were included in this study. Sequential radiographs were evaluated for the progression of collapse. Clinical profiles, including age, body mass index, follow-up period and Singh's index, were documented. The morphological characteristics of the low-intensity band on T 1 weighted MRI were also examined with regards to four factors: band length, band thickness, the length of the weight-bearing portion and the band length ratio (defined as the proportion of the band length to the weight-bearing portion of the femoral head in the slice through the femoral head centre). Results: Radiographically, a progression of collapse was observed in 15 of 25 (60.0%) patients. The band length in patients with progression of collapse [22.5 mm; 95% confidence interval (CI) 17.7, 27.3] was significantly larger than in patients without a progression of collapse (13.4 mm; 95% CI 7.6, 19.3; p<0.05). The band length ratio in patients with progression of collapse (59.8%; 95% CI 50.8, 68.9) was also significantly higher than in patients without a progression of collapse (40.9%; 95% CI 29.8, 52.0; p<0.05). No significant differences were present in the other values. Conclusion: These results indicate that the band length and the band length ratio might be predictive for the progression of collapse in SIF.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalBritish Journal of Radiology
Volume85
Issue number1011
DOIs
Publication statusPublished - Mar 1 2012

Fingerprint

Stress Fractures
Thigh
Confidence Intervals
Weight-Bearing
Body Mass Index

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

Cite this

Prognostic factors associated with a subchondral insufficiency fracture of the femoral head. / Iwasaki, K.; Yamamoto, Takuaki; Motomura, G.; Ikemura, S.; Mawatari, T.; Nakashima, Y.; Iwamoto, Y.

In: British Journal of Radiology, Vol. 85, No. 1011, 01.03.2012, p. 214-218.

Research output: Contribution to journalArticle

@article{75b334ccdb3b4dcdb4e57b0f37f8e80d,
title = "Prognostic factors associated with a subchondral insufficiency fracture of the femoral head",
abstract = "Objective: The aim of this study was to identify the risk factors associated with the prognosis of a subchondral insufficiency fracture of the femoral head (SIF). Methods: Between June 2002 and July 2009, 25 patients diagnosed with SIF were included in this study. Sequential radiographs were evaluated for the progression of collapse. Clinical profiles, including age, body mass index, follow-up period and Singh's index, were documented. The morphological characteristics of the low-intensity band on T 1 weighted MRI were also examined with regards to four factors: band length, band thickness, the length of the weight-bearing portion and the band length ratio (defined as the proportion of the band length to the weight-bearing portion of the femoral head in the slice through the femoral head centre). Results: Radiographically, a progression of collapse was observed in 15 of 25 (60.0{\%}) patients. The band length in patients with progression of collapse [22.5 mm; 95{\%} confidence interval (CI) 17.7, 27.3] was significantly larger than in patients without a progression of collapse (13.4 mm; 95{\%} CI 7.6, 19.3; p<0.05). The band length ratio in patients with progression of collapse (59.8{\%}; 95{\%} CI 50.8, 68.9) was also significantly higher than in patients without a progression of collapse (40.9{\%}; 95{\%} CI 29.8, 52.0; p<0.05). No significant differences were present in the other values. Conclusion: These results indicate that the band length and the band length ratio might be predictive for the progression of collapse in SIF.",
author = "K. Iwasaki and Takuaki Yamamoto and G. Motomura and S. Ikemura and T. Mawatari and Y. Nakashima and Y. Iwamoto",
year = "2012",
month = "3",
day = "1",
doi = "10.1259/bjr/44936440",
language = "English",
volume = "85",
pages = "214--218",
journal = "British Journal of Radiology",
issn = "0007-1285",
publisher = "British Institute of Radiology",
number = "1011",

}

TY - JOUR

T1 - Prognostic factors associated with a subchondral insufficiency fracture of the femoral head

AU - Iwasaki, K.

AU - Yamamoto, Takuaki

AU - Motomura, G.

AU - Ikemura, S.

AU - Mawatari, T.

AU - Nakashima, Y.

AU - Iwamoto, Y.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - Objective: The aim of this study was to identify the risk factors associated with the prognosis of a subchondral insufficiency fracture of the femoral head (SIF). Methods: Between June 2002 and July 2009, 25 patients diagnosed with SIF were included in this study. Sequential radiographs were evaluated for the progression of collapse. Clinical profiles, including age, body mass index, follow-up period and Singh's index, were documented. The morphological characteristics of the low-intensity band on T 1 weighted MRI were also examined with regards to four factors: band length, band thickness, the length of the weight-bearing portion and the band length ratio (defined as the proportion of the band length to the weight-bearing portion of the femoral head in the slice through the femoral head centre). Results: Radiographically, a progression of collapse was observed in 15 of 25 (60.0%) patients. The band length in patients with progression of collapse [22.5 mm; 95% confidence interval (CI) 17.7, 27.3] was significantly larger than in patients without a progression of collapse (13.4 mm; 95% CI 7.6, 19.3; p<0.05). The band length ratio in patients with progression of collapse (59.8%; 95% CI 50.8, 68.9) was also significantly higher than in patients without a progression of collapse (40.9%; 95% CI 29.8, 52.0; p<0.05). No significant differences were present in the other values. Conclusion: These results indicate that the band length and the band length ratio might be predictive for the progression of collapse in SIF.

AB - Objective: The aim of this study was to identify the risk factors associated with the prognosis of a subchondral insufficiency fracture of the femoral head (SIF). Methods: Between June 2002 and July 2009, 25 patients diagnosed with SIF were included in this study. Sequential radiographs were evaluated for the progression of collapse. Clinical profiles, including age, body mass index, follow-up period and Singh's index, were documented. The morphological characteristics of the low-intensity band on T 1 weighted MRI were also examined with regards to four factors: band length, band thickness, the length of the weight-bearing portion and the band length ratio (defined as the proportion of the band length to the weight-bearing portion of the femoral head in the slice through the femoral head centre). Results: Radiographically, a progression of collapse was observed in 15 of 25 (60.0%) patients. The band length in patients with progression of collapse [22.5 mm; 95% confidence interval (CI) 17.7, 27.3] was significantly larger than in patients without a progression of collapse (13.4 mm; 95% CI 7.6, 19.3; p<0.05). The band length ratio in patients with progression of collapse (59.8%; 95% CI 50.8, 68.9) was also significantly higher than in patients without a progression of collapse (40.9%; 95% CI 29.8, 52.0; p<0.05). No significant differences were present in the other values. Conclusion: These results indicate that the band length and the band length ratio might be predictive for the progression of collapse in SIF.

UR - http://www.scopus.com/inward/record.url?scp=84863273213&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863273213&partnerID=8YFLogxK

U2 - 10.1259/bjr/44936440

DO - 10.1259/bjr/44936440

M3 - Article

C2 - 21159802

AN - SCOPUS:84863273213

VL - 85

SP - 214

EP - 218

JO - British Journal of Radiology

JF - British Journal of Radiology

SN - 0007-1285

IS - 1011

ER -