The Experts below are selected from a list of 498 Experts worldwide ranked by ideXlab platform

H K Genant - One of the best experts on this subject based on the ideXlab platform.

  • Brief report Longitudinal study of magnetic resonance imaging and standard X-rays to assess disease progression in osteoarthritis
    2007
    Co-Authors: H K Genant, Charles Peterfy, S Zaim, M. Kothari, D. White, Nansa Burlet, D Ethgen, T. Montague, C. Dabrowski
    Abstract:

    Summary Objective: To investigate, over 1-year, the relationship between X-ray and magnetic resonance imaging (MRI) findings in patients with knee osteoarthritis (OA). Methods: Sixty-two osteoarthritic patients (46 women) were followed for 1 year. At baseline and after 1 year, volume and thickness of cartilage of the Medial tibia, the lateral tibia and the femur were assessed by MRI. A global score from the multi-feature whole-organ MRI scoring system (WORMS) was calculated for each patient at baseline and after 1 year. This score combined individual scores for articular cartilage, osteophytes, bone marrow abnormality, subchondral cysts and bone attrition in 14 locations. It also incorporated scores for the Medial and lateral menisci, anterior and posterior cruciate ligaments, Medial and lateral collateral ligaments and synovial distension. Lateral and Medial Femorotibial Joint space width (JSW) measurements, performed by digital image analysis, were assessed from fixed-flexion, postero-anterior knee radiographs. Results: One-year changes in Medial femoro-tibial JSW reach 6.7 (20.5) % and changes in Medial cartilage volume and thickness reach 0.4 (16.7) % and 2.1 (11.3) %, respectively. Medial femoro-tibial Joint space narrowing (JSN) after 1 year, assessed by radiography, was significantly correlated with a loss of Medial tibial cartilage volume (r ¼ 0.25, P ¼ 0.046) and Medial tibial cartilage thickness (r ¼ 0.28, P ¼ 0.025), over the same period. We found also a significant correlation between the progression of the WORMS and radiographic Medial JSN over 1 year (r ¼� 0.35, P ¼ 0.006). All these results remained statistically significant after adjusting for age, sex and body mass index.

  • Comparison of fixed-flexion positioning with fluoroscopic semi-flexed positioning for quantifying radiographic Joint-space width in the knee: test-retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, S Zaim, Jeffrey Duryea, Y Miaux, J. Lynch, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint. Methods Posteroanterior radiographs of the right knees of 18 normal volunteers were acquired with the patients standing on an upright fluoroscopy table, the feet externally rotated 10° and the toes touching the vertical table. Knees were positioned and radiographed with two different techniques: (1) semi-flexed positioning under fluoroscopic guidance using a horizontal X-ray beam; and (2) fixed-flexion positioning, with the knees and thighs touching the vertical table, using 10° caudal beam angulation without fluoroscopy. Foot maps were drawn in each case. Subjects were repositioned and radiographed twice using each technique. The posteroanterior beam angle that optimally projected the Medial tibia plateau with the patient in the fixed-flexion position was also determined for each subject in a separate examination using fluoroscopy. Ten patients with osteoarthritis were also examined with the fixed-flexion technique using a conventional radiographic unit. Minimum Medial Joint-space width (JSW) in the Medial Femorotibial Joint was measured manually with a graduated lens and also with a semi-automated computer algorithm. Results Reproducibility errors (root-mean-square SD) for manual and automated JSW measurement were 0.2 mm and 0.1 mm, respectively, for fluoroscopic semi-flexed positioning in volunteers; 0.3 mm and 0.1 mm, respectively, for fixed-flexion positioning in volunteers; and 0.2 mm and 0.1 mm, respectively, for fixed-flexion positioning in osteoarthritic patients. The optimal beam angle for visualizing the Joint space was 9.0°±3.6°. Conclusion Fixed-flexion, non-fluoroscopic radiography of the knee can provide reproducible JSW measurement using widely available X-ray equipment. This technique is more feasible for multicenter clinical studies and routine clinical use than are methods that rely on fluoroscopic alignment of the tibial plateau.

  • comparison of fixed flexion positioning with fluoroscopic semi flexed positioning for quantifying radiographic Joint space width in the knee test retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, J Li, S Zaim, Jeffrey Duryea, J A Lynch, Y Miaux, W Yu, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint.

Georg N Duda - One of the best experts on this subject based on the ideXlab platform.

  • MRI findings of knee abnormalities in adolescent and adult volleyball players
    Journal of Experimental Orthopaedics, 2017
    Co-Authors: Heide Boeth, Arne Schlausch, Wolfgang Wirth, Gerd Diederichs, Aoife Macmahon, Friedrich Eckstein, Georg N Duda
    Abstract:

    BackgroundTo longitudinally and cross-sectionally evaluate knee abnormalities by sex and age in adolescent and adult volleyball athletes over 2 years using magnetic resonance imaging (MRI).MethodsThirty-six high-level volleyball athletes (18 adolescents: 56% female, mean age 16.0 ± 0.8 years; and 18 adults: 50% female, mean age 46.8 ± 5.1 years) were imaged by MRI at BL and at 2-year follow-up (FU). Prevalence and severity of cartilage lesions, subarticular bone marrow lesions (BMLs), subarticular cysts, osteophytes, and ligament and meniscus integrity were evaluated by sex and by age cohort (adolescents and adults) using the whole-organ MRI score (WORMS).ResultsThere were no significant longitudinal changes in any of the features within any of the sex or age groups. No significant differences were found in overall prevalence or severity of any of the features between males and females, although at FU, males had a significantly higher prevalence of osteophytes in the Medial Femorotibial Joint (MFTJ) than females (p=0.044). Compared to adolescents, adult volleyball players had a significantly greater prevalence and severity of cartilage lesions (p

  • MRI findings of knee abnormalities in adolescent and adult volleyball players
    Journal of Experimental Orthopaedics, 2017
    Co-Authors: Heide Boeth, Arne Schlausch, Wolfgang Wirth, Gerd Diederichs, Aoife Macmahon, F Eckstein, Georg N Duda
    Abstract:

    To longitudinally and cross-sectionally evaluate knee abnormalities by sex and age in adolescent and adult volleyball athletes over 2 years using magnetic resonance imaging (MRI). Thirty-six high-level volleyball athletes (18 adolescents: 56% female, mean age 16.0 ± 0.8 years; and 18 adults: 50% female, mean age 46.8 ± 5.1 years) were imaged by MRI at BL and at 2-year follow-up (FU). Prevalence and severity of cartilage lesions, subarticular bone marrow lesions (BMLs), subarticular cysts, osteophytes, and ligament and meniscus integrity were evaluated by sex and by age cohort (adolescents and adults) using the whole-organ MRI score (WORMS). There were no significant longitudinal changes in any of the features within any of the sex or age groups. No significant differences were found in overall prevalence or severity of any of the features between males and females, although at FU, males had a significantly higher prevalence of osteophytes in the Medial Femorotibial Joint (MFTJ) than females (p=0.044). Compared to adolescents, adult volleyball players had a significantly greater prevalence and severity of cartilage lesions (p

Charles Peterfy - One of the best experts on this subject based on the ideXlab platform.

  • Brief report Longitudinal study of magnetic resonance imaging and standard X-rays to assess disease progression in osteoarthritis
    2007
    Co-Authors: H K Genant, Charles Peterfy, S Zaim, M. Kothari, D. White, Nansa Burlet, D Ethgen, T. Montague, C. Dabrowski
    Abstract:

    Summary Objective: To investigate, over 1-year, the relationship between X-ray and magnetic resonance imaging (MRI) findings in patients with knee osteoarthritis (OA). Methods: Sixty-two osteoarthritic patients (46 women) were followed for 1 year. At baseline and after 1 year, volume and thickness of cartilage of the Medial tibia, the lateral tibia and the femur were assessed by MRI. A global score from the multi-feature whole-organ MRI scoring system (WORMS) was calculated for each patient at baseline and after 1 year. This score combined individual scores for articular cartilage, osteophytes, bone marrow abnormality, subchondral cysts and bone attrition in 14 locations. It also incorporated scores for the Medial and lateral menisci, anterior and posterior cruciate ligaments, Medial and lateral collateral ligaments and synovial distension. Lateral and Medial Femorotibial Joint space width (JSW) measurements, performed by digital image analysis, were assessed from fixed-flexion, postero-anterior knee radiographs. Results: One-year changes in Medial femoro-tibial JSW reach 6.7 (20.5) % and changes in Medial cartilage volume and thickness reach 0.4 (16.7) % and 2.1 (11.3) %, respectively. Medial femoro-tibial Joint space narrowing (JSN) after 1 year, assessed by radiography, was significantly correlated with a loss of Medial tibial cartilage volume (r ¼ 0.25, P ¼ 0.046) and Medial tibial cartilage thickness (r ¼ 0.28, P ¼ 0.025), over the same period. We found also a significant correlation between the progression of the WORMS and radiographic Medial JSN over 1 year (r ¼� 0.35, P ¼ 0.006). All these results remained statistically significant after adjusting for age, sex and body mass index.

  • Comparison of fixed-flexion positioning with fluoroscopic semi-flexed positioning for quantifying radiographic Joint-space width in the knee: test-retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, S Zaim, Jeffrey Duryea, Y Miaux, J. Lynch, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint. Methods Posteroanterior radiographs of the right knees of 18 normal volunteers were acquired with the patients standing on an upright fluoroscopy table, the feet externally rotated 10° and the toes touching the vertical table. Knees were positioned and radiographed with two different techniques: (1) semi-flexed positioning under fluoroscopic guidance using a horizontal X-ray beam; and (2) fixed-flexion positioning, with the knees and thighs touching the vertical table, using 10° caudal beam angulation without fluoroscopy. Foot maps were drawn in each case. Subjects were repositioned and radiographed twice using each technique. The posteroanterior beam angle that optimally projected the Medial tibia plateau with the patient in the fixed-flexion position was also determined for each subject in a separate examination using fluoroscopy. Ten patients with osteoarthritis were also examined with the fixed-flexion technique using a conventional radiographic unit. Minimum Medial Joint-space width (JSW) in the Medial Femorotibial Joint was measured manually with a graduated lens and also with a semi-automated computer algorithm. Results Reproducibility errors (root-mean-square SD) for manual and automated JSW measurement were 0.2 mm and 0.1 mm, respectively, for fluoroscopic semi-flexed positioning in volunteers; 0.3 mm and 0.1 mm, respectively, for fixed-flexion positioning in volunteers; and 0.2 mm and 0.1 mm, respectively, for fixed-flexion positioning in osteoarthritic patients. The optimal beam angle for visualizing the Joint space was 9.0°±3.6°. Conclusion Fixed-flexion, non-fluoroscopic radiography of the knee can provide reproducible JSW measurement using widely available X-ray equipment. This technique is more feasible for multicenter clinical studies and routine clinical use than are methods that rely on fluoroscopic alignment of the tibial plateau.

  • comparison of fixed flexion positioning with fluoroscopic semi flexed positioning for quantifying radiographic Joint space width in the knee test retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, J Li, S Zaim, Jeffrey Duryea, J A Lynch, Y Miaux, W Yu, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint.

Heide Boeth - One of the best experts on this subject based on the ideXlab platform.

  • MRI findings of knee abnormalities in adolescent and adult volleyball players
    Journal of Experimental Orthopaedics, 2017
    Co-Authors: Heide Boeth, Arne Schlausch, Wolfgang Wirth, Gerd Diederichs, Aoife Macmahon, Friedrich Eckstein, Georg N Duda
    Abstract:

    BackgroundTo longitudinally and cross-sectionally evaluate knee abnormalities by sex and age in adolescent and adult volleyball athletes over 2 years using magnetic resonance imaging (MRI).MethodsThirty-six high-level volleyball athletes (18 adolescents: 56% female, mean age 16.0 ± 0.8 years; and 18 adults: 50% female, mean age 46.8 ± 5.1 years) were imaged by MRI at BL and at 2-year follow-up (FU). Prevalence and severity of cartilage lesions, subarticular bone marrow lesions (BMLs), subarticular cysts, osteophytes, and ligament and meniscus integrity were evaluated by sex and by age cohort (adolescents and adults) using the whole-organ MRI score (WORMS).ResultsThere were no significant longitudinal changes in any of the features within any of the sex or age groups. No significant differences were found in overall prevalence or severity of any of the features between males and females, although at FU, males had a significantly higher prevalence of osteophytes in the Medial Femorotibial Joint (MFTJ) than females (p=0.044). Compared to adolescents, adult volleyball players had a significantly greater prevalence and severity of cartilage lesions (p

  • MRI findings of knee abnormalities in adolescent and adult volleyball players
    Journal of Experimental Orthopaedics, 2017
    Co-Authors: Heide Boeth, Arne Schlausch, Wolfgang Wirth, Gerd Diederichs, Aoife Macmahon, F Eckstein, Georg N Duda
    Abstract:

    To longitudinally and cross-sectionally evaluate knee abnormalities by sex and age in adolescent and adult volleyball athletes over 2 years using magnetic resonance imaging (MRI). Thirty-six high-level volleyball athletes (18 adolescents: 56% female, mean age 16.0 ± 0.8 years; and 18 adults: 50% female, mean age 46.8 ± 5.1 years) were imaged by MRI at BL and at 2-year follow-up (FU). Prevalence and severity of cartilage lesions, subarticular bone marrow lesions (BMLs), subarticular cysts, osteophytes, and ligament and meniscus integrity were evaluated by sex and by age cohort (adolescents and adults) using the whole-organ MRI score (WORMS). There were no significant longitudinal changes in any of the features within any of the sex or age groups. No significant differences were found in overall prevalence or severity of any of the features between males and females, although at FU, males had a significantly higher prevalence of osteophytes in the Medial Femorotibial Joint (MFTJ) than females (p=0.044). Compared to adolescents, adult volleyball players had a significantly greater prevalence and severity of cartilage lesions (p

S Zaim - One of the best experts on this subject based on the ideXlab platform.

  • Brief report Longitudinal study of magnetic resonance imaging and standard X-rays to assess disease progression in osteoarthritis
    2007
    Co-Authors: H K Genant, Charles Peterfy, S Zaim, M. Kothari, D. White, Nansa Burlet, D Ethgen, T. Montague, C. Dabrowski
    Abstract:

    Summary Objective: To investigate, over 1-year, the relationship between X-ray and magnetic resonance imaging (MRI) findings in patients with knee osteoarthritis (OA). Methods: Sixty-two osteoarthritic patients (46 women) were followed for 1 year. At baseline and after 1 year, volume and thickness of cartilage of the Medial tibia, the lateral tibia and the femur were assessed by MRI. A global score from the multi-feature whole-organ MRI scoring system (WORMS) was calculated for each patient at baseline and after 1 year. This score combined individual scores for articular cartilage, osteophytes, bone marrow abnormality, subchondral cysts and bone attrition in 14 locations. It also incorporated scores for the Medial and lateral menisci, anterior and posterior cruciate ligaments, Medial and lateral collateral ligaments and synovial distension. Lateral and Medial Femorotibial Joint space width (JSW) measurements, performed by digital image analysis, were assessed from fixed-flexion, postero-anterior knee radiographs. Results: One-year changes in Medial femoro-tibial JSW reach 6.7 (20.5) % and changes in Medial cartilage volume and thickness reach 0.4 (16.7) % and 2.1 (11.3) %, respectively. Medial femoro-tibial Joint space narrowing (JSN) after 1 year, assessed by radiography, was significantly correlated with a loss of Medial tibial cartilage volume (r ¼ 0.25, P ¼ 0.046) and Medial tibial cartilage thickness (r ¼ 0.28, P ¼ 0.025), over the same period. We found also a significant correlation between the progression of the WORMS and radiographic Medial JSN over 1 year (r ¼� 0.35, P ¼ 0.006). All these results remained statistically significant after adjusting for age, sex and body mass index.

  • Comparison of fixed-flexion positioning with fluoroscopic semi-flexed positioning for quantifying radiographic Joint-space width in the knee: test-retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, S Zaim, Jeffrey Duryea, Y Miaux, J. Lynch, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint. Methods Posteroanterior radiographs of the right knees of 18 normal volunteers were acquired with the patients standing on an upright fluoroscopy table, the feet externally rotated 10° and the toes touching the vertical table. Knees were positioned and radiographed with two different techniques: (1) semi-flexed positioning under fluoroscopic guidance using a horizontal X-ray beam; and (2) fixed-flexion positioning, with the knees and thighs touching the vertical table, using 10° caudal beam angulation without fluoroscopy. Foot maps were drawn in each case. Subjects were repositioned and radiographed twice using each technique. The posteroanterior beam angle that optimally projected the Medial tibia plateau with the patient in the fixed-flexion position was also determined for each subject in a separate examination using fluoroscopy. Ten patients with osteoarthritis were also examined with the fixed-flexion technique using a conventional radiographic unit. Minimum Medial Joint-space width (JSW) in the Medial Femorotibial Joint was measured manually with a graduated lens and also with a semi-automated computer algorithm. Results Reproducibility errors (root-mean-square SD) for manual and automated JSW measurement were 0.2 mm and 0.1 mm, respectively, for fluoroscopic semi-flexed positioning in volunteers; 0.3 mm and 0.1 mm, respectively, for fixed-flexion positioning in volunteers; and 0.2 mm and 0.1 mm, respectively, for fixed-flexion positioning in osteoarthritic patients. The optimal beam angle for visualizing the Joint space was 9.0°±3.6°. Conclusion Fixed-flexion, non-fluoroscopic radiography of the knee can provide reproducible JSW measurement using widely available X-ray equipment. This technique is more feasible for multicenter clinical studies and routine clinical use than are methods that rely on fluoroscopic alignment of the tibial plateau.

  • comparison of fixed flexion positioning with fluoroscopic semi flexed positioning for quantifying radiographic Joint space width in the knee test retest reproducibility
    Skeletal Radiology, 2003
    Co-Authors: Charles Peterfy, J Li, S Zaim, Jeffrey Duryea, J A Lynch, Y Miaux, W Yu, H K Genant
    Abstract:

    Objective To compare fixed-flexion radiography of the knee with fluoroscopic semi-flexed radiography in terms of the reproducibility of measurements of minimum Joint-space width (JSW) in the Medial Femorotibial Joint.