Roentgenographic Study on Shape and Size of the Femoral Head of Normal Korean Adults

Bae, Young Jae; Kang, Ki Ser; Tae, Suk Kee; Jung, Yung Bok; Lee, Han Jun; Jin, Whui Jae

doi:10.4055/jkoa.1995.30.3.607

Cited by 4 publications

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“…In this study, magni cation error by projection distance was adjusted with MCF. Bae et al 12) suggested that magni cation rate was smaller as projection distance shortened, and magni cation rate of plain X-ray of the femoral head was approximately 11.4%. In the present study, MCF was 0.88 (± 0.04) and we veri ed that the size needed to be reduced by about 12% on plain X-ray to be nearest to the actual size.…”

Section: Discussionmentioning

confidence: 99%

“…The projected femoral offset (FOP) was de ned as the perpendicular distance from the hip center of rotation to the femoral shaft axis on plain X-ray images. Since measurement errors occur on radiographs due to magni cation rates by projection distance from the Xray source to the anatomical structure, magni cation correction factor (MCF) was calculated and used to reduce errors in the real FO value 12) . Since the shape of the acetabular cup is a hemisphere, the real cup diameter (CDR) can be obtained via correction for error rates according to projection distance because the maximum diameter of the cup represents the true hemispherical diameter on a plane in orthographic projection due to the geometrical nature.…”

Section: Radiological Assessmentmentioning

confidence: 99%

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Relationship of Femoral Offset and Clinical Outcomes of Femoral Neck Fracture Patients Following Bipolar Hip Arthroplasty

Kim

Lee

2020

Preprint

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Background This study aimed to investigate the relationship between femoral offset(FO) and clinical outcomes of patients with femoral neck fracture following bipolar hip arthroplasty(BHA). Methods A hospital registry-based retrospective study, involving 520 patients who underwent BHA for femoral neck fracture and with a minimum follow-up of one year, Dong-A university hospital, from December 1, 2003, to September 31, 2018, was carried out. Excluding those with unclear medical records, a previous surgical history on the affected or contralateral hip, a congenital deformity and preoperative trauma history of the hip, high-energy multiple trauma, a history of neurodegenerative disease or cerebrovascular disease, a total of 77 patients were included in the analysis. The subjects were 54 females and 23 males. The mean age of patients was 74.6(65–95) years old and the mean follow-up period was 30.5 (12–136) months. For clinical assessment, postoperative pain visual analogue scale(VAS) and Harris hip score (HHS) were analyzed at each follow-up period. For radiological assessment, the difference in leg length discrepancy (LLD) and FO was measured. FO nearest to the real value was calculated using the values corrected for magnification and rotation errors on the anteroposterior view of plain radiographs taken at the first year of follow-up. In statistical analyses, the statistical significance between FO and clinical outcomes was analyzed using the Pearson correlation tests with SPSS v. 25.0. A value of p < 0.05 was considered statistically significant. Results The difference in mean FO postoperatively was 6.7(± 4.8) mm, and the difference in mean postoperative LLD was 4.9 (± 3.4). The mean HHS was 77.1(± 7.7), 82.3(± 8.6), 83.4(± 7.7), and 86.4(± 6.7) at 1st, 3rd, 6th and 12th postoperative months, respectively. In the analysis using the Pearson correlation coefficient, the correlation coefficient between FO and HHS in 1-year follow-up was − 0.38, and a significant outcome was found (p = 0.001). Of HHS domain, the correlation coefficient for function in 1-year follow-up was − 0.42, revealing a significant outcome (p = 0.0001). Conclusions There was a stastically significant correlation between clinical oucomes and FO difference at 1 year after BHA in patients with femoral neck fractures older than 65 years.

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Section: Discussionmentioning

confidence: 99%

Section: Radiological Assessmentmentioning

confidence: 99%

Relationship of Femoral Offset and Clinical Outcomes of Femoral Neck Fracture Patients Following Bipolar Hip Arthroplasty

Kim

Lee

2020

Preprint

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“…Several studies have reported that errors can occur due to internal rotation and projection distance in measurement of hip offsets after THA, and an underestimation of the offset value on plain radiographs due to internal rotation has been commonly accepted [12][13][14][15][16] .…”

Section: Discussionmentioning

confidence: 99%

“…In this study, magnification error by projection distance was adjusted with MCF. Bae et al 12) suggested that magnification rate was smaller as projection distance shortened, and magnification rate of plain X-ray of the femoral head was approximately 11.4%. In the present study, MCF was 0.88 (±0.04) and we verified that the size needed to be reduced by about 12% on plain X-ray to be nearest to the actual size.…”

Section: Discussionmentioning

confidence: 99%

“…The projected femoral offset (FOP) was defined as the perpendicular distance from the hip center of rotation to the femoral shaft axis on plain X-ray images. Since measurement errors occur on radiographs due to magnification rates by projection distance from the X-ray source to the anatomical structure, magnification correction factor (MCF) was calculated and used to reduce errors in the real FO value 12) . Since the shape of the acetabular cup is a hemisphere, the real cup diameter (CDR) can be obtained via correction for error rates according to projection distance because the maximum diameter of the cup represents the true hemispherical diameter on a plane in orthographic projection due to the geometrical nature.…”

Section: Radiological Assessmentmentioning

confidence: 99%

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Relationship of femoral offset and clinical outcomes of femoral neck fracture patients following bipolar hip arthroplasty

Kim

Lee

2020

Preprint

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PurposeThis study aimed to investigate the relationship between femoral offset(FO) and clinical outcomes of patients with femoral neck fracture following bipolar hip arthroplasty(BHA). Materials and MethodsThis study recruited 520 patients who underwent BHA for femoral neck fracture from December 2003 to September 2018 with a minimum follow-up of one year. Excluding those with unclear medical records, a previous surgical history on the affected or contralateral hip, a congenital deformity and preoperative trauma history of the hip, high-energy multiple trauma, a history of neurodegenerative disease or cerebrovascular disease, a total of 77 patients were included in the analysis. The subjects were 54 females and 23 males. The mean age of patients was 74.6(65-95) years old and the mean follow-up period was 30.5 (12-136) months. For clinical assessment, postoperative pain visual analogue scale(VAS) and Harris hip score (HHS) were analyzed at each follow-up period. For radiological assessment, the difference in leg length discrepancy (LLD) and FO was measured. FO nearest to the real value was calculated using the values corrected for magnification and rotation errors on the anteroposterior view of plain radiographs taken at the first year of follow-up. In statistical analyses, the statistical significance between FO and clinical outcomes was analyzed using the Pearson correlation tests with SPSS v. 25.0. A value of p < 0.05 was considered statistically significant.ResultsThe difference in mean FO postoperatively was 6.7(±4.8) mm, and the difference in mean postoperative LLD was 4.9 (±3.4). The mean HHS was 77.1(±7.7), 82.3(±8.6), 83.4(±7.7), and 86.4(±6.7) at 1st , 3rd , 6th and 12th postoperative months, respectively. In the analysis using the Pearson correlation coefficient, the correlation coefficient between FO and HHS in 1-year follow-up was -0.38, and a significant outcome was found (p=0.001). Of HHS domain, the correlation coefficient for function in 1-year follow-up was -0.42, revealing a significant outcome (p=0.0001).ConclusionThere was a stastically significant correlation between clinical oucomes and FO difference at 1 year after BHA in patients with femoral neck fractures older than 65 years.

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Impact Attenuation of the Soft Pads and the Wearable Airbag for the Hip Protection in the Elderly

Jeong

Ahn

Kim

et al. 2019

Int. J. Precis. Eng. Manuf.

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Roentgenographic Study on Shape and Size of the Femoral Head of Normal Korean Adults

Cited by 4 publications

References 0 publications

Relationship of Femoral Offset and Clinical Outcomes of Femoral Neck Fracture Patients Following Bipolar Hip Arthroplasty

Relationship of Femoral Offset and Clinical Outcomes of Femoral Neck Fracture Patients Following Bipolar Hip Arthroplasty

Relationship of femoral offset and clinical outcomes of femoral neck fracture patients following bipolar hip arthroplasty

Impact Attenuation of the Soft Pads and the Wearable Airbag for the Hip Protection in the Elderly

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