Radius Bone

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Daniel Cansino - One of the best experts on this subject based on the ideXlab platform.

Mami Matsukawa - One of the best experts on this subject based on the ideXlab platform.

  • In vivo Radius Bone evaluation in their teens by two longitudinal wave propagation
    The Journal of the Acoustical Society of America, 2017
    Co-Authors: Mami Matsukawa, Isao Mano, Kaoru Horii, Yutaro Yoneda, Shiori Umemura, Etsuko Ozaki
    Abstract:

    An ultrasonic Bone measurement system, LD-100 (OYO electric),1 has been developed for the evaluation of the distal 5.5% site of the Radius of the non-dominant hand. The system measures two longitudinal waves (fast and slow waves) which propagate in the inside cancellous Bone and echo waves reflected from the interface between the cortical and cancellous Bones. The properties of these waves can give us the information of cancellous Bones. We can also estimate the cortical thickness from the echo waves. For the small Radius of teenagers, we have improved the system using an annular type transducer to avoid the effects of guided waves in the cortical Bone. The Radius Bones of 654 teenagers were measured. The cortical thicknesses of female students in their late teens were around 95 % of the young adult mean (YAM), where those of male students showed variation from 90 to 100%. The cancellous Bone densities in their late teens were 82–94% (female) and 66–85% (male). The growth of cancellous Bone was late, which was clearer in men. In addition, the total Bone growth of men seemed slower than that of women. 1H. Sai, et al., Osteoporos Int. (2010) 21:1781.An ultrasonic Bone measurement system, LD-100 (OYO electric),1 has been developed for the evaluation of the distal 5.5% site of the Radius of the non-dominant hand. The system measures two longitudinal waves (fast and slow waves) which propagate in the inside cancellous Bone and echo waves reflected from the interface between the cortical and cancellous Bones. The properties of these waves can give us the information of cancellous Bones. We can also estimate the cortical thickness from the echo waves. For the small Radius of teenagers, we have improved the system using an annular type transducer to avoid the effects of guided waves in the cortical Bone. The Radius Bones of 654 teenagers were measured. The cortical thicknesses of female students in their late teens were around 95 % of the young adult mean (YAM), where those of male students showed variation from 90 to 100%. The cancellous Bone densities in their late teens were 82–94% (female) and 66–85% (male). The growth of cancellous Bone was late, whic...

  • In vivo Radius Bone evaluation of teenagers by modified two wave ultrasound apparatus
    2017 IEEE International Ultrasonics Symposium (IUS), 2017
    Co-Authors: Mami Matsukawa, Isao Mano, Kaoru Horii, Yutaro Yoneda, Shiori Umemura, Etsuko Ozaki
    Abstract:

    The postmenopausal osteoporosis is likely influenced by the events taking place during Bone development [1]. To prevent future risk of osteoporosis, the appropriate growth of Bone during teenagers is important. The ultrasonic Bone densitometry is portable and has no radiation exposure, which is suitable for the evaluation of children's Bone. In this study, an ultrasonic Bone measurement system of distal Radius was modified for the small Bones and applied to teenagers.

  • effect of medullary cavity in cancellous Bone on two wave phenomenon
    Japanese Journal of Applied Physics, 2016
    Co-Authors: Takuma Hachiken, Shoko Nakanishi, Mami Matsukawa
    Abstract:

    Osteoporotic patients have a larger medullary cavity in their cancellous Bone than healthy people. In this study, the effect of the medullary cavity on the two-wave phenomenon was experimentally investigated using a cancellous Bone model and a Radius Bone model. In the cancellous Bone model, with the increase in hole (medullary cavity) diameter, the amplitudes of the fast waves became smaller, whereas the amplitudes of the slow waves became larger. In the Radius Bone model, the fast wave overlapped with the circumferential wave. The slow wave became larger with increasing hole diameter. The analysis of the slow wave thus seems to be useful for the in vivo diagnosis of the degree of osteoporosis.

  • In vivo Radius Bone evaluation of women in their late teens by two wave apparatus
    The Journal of the Acoustical Society of America, 2016
    Co-Authors: Mami Matsukawa, Shoko Nakanishi, Isao Mano, Kaoru Horii, Yutaro Yoneda, Shiori Umemura, Etsuko Ozaki
    Abstract:

    Making use of the fast and slow wave phenomenon in cancellous Bone, an ultrasonic Bone measurement system, LD-100 (OYO electric),1 has been developed and is now commercially available in Japan. From the measurements of fast, slow, and echo waves, the system gives us cancellous Bone density (mg/cm3), cancellous Bone elasticity (GPa), and the cortical thickness (mm). The measurement area is the distal 5.5 % site of the Radius of the non-dominant hand. In this study, the system was modified for the small Radius of teenagers using annular array elements. Under the permission of the ethics committee at Doshisha university, Radius Bones of 111 high school students were measured (15-17 years old, female). The mean values of cortical thickness of the students were 93.7—97.7% of the young adult mean (YAM). The cancellous Bone densities were 82.6—94.0% of YAM. The standard deviations of these values were higher than the deviations of YAM. These data possibly indicate that the growth of Radius Bone depends on the si...

  • Influence of the circumferential wave on the fast and slow wave propagation in small distal Radius Bone
    Japanese Journal of Applied Physics, 2014
    Co-Authors: Isao Mano, Mami Matsukawa, Kaoru Horii, Fuminori Fujita, Yoshiki Nagatani, Takahiko Otani
    Abstract:

    An ultrasonic system is good for the evaluation of children because its noninvasiveness. The ultrasonic Bone measurement system LD-100 has been developed on the basis of the principle of the fast and slow wave phenomenon in the wrist Bone. In the measurement of small Bones such as those of children, there are some problems due to the influences of circumferential waves on the fast and slow waves. When the diameters of the focused transducers were small, the appearance of the circumferential wave around the cortical Bone became late, and it could avoid one of the influences of the circumferential waves.

Manuel Zafra - One of the best experts on this subject based on the ideXlab platform.

Min Jong Park - One of the best experts on this subject based on the ideXlab platform.

  • Treatment of avascular proximal pole scaphoid nonunions with vascularized distal Radius Bone grafting.
    The Journal of hand surgery, 2013
    Co-Authors: Tae Kang Lim, Hyo Kon Kim, Kyoung Hwan Koh, Hyun Il Lee, Sung Jong Woo, Min Jong Park
    Abstract:

    Purpose To investigate the outcomes of vascularized distal Radius pedicled Bone grafting secured with K-wires for scaphoid nonunions with small avascular proximal fragments. Methods We included patients with scaphoid nonunions and small, avascular proximal fragments that were too small for screw fixation. The mean size of the proximal pole fragments was 21% (range, 9% to 28%) of the entire scaphoid, based on quantitative radiographic measurement. All patients had distal Radius Bone grafting based on the 1,2-intercompartmental supraretinacular artery pedicle and fixation with K-wires. There were 21 wrists in 18 men and 2 women with the mean age of 34 years (range, 22 to 57 y). The mean duration of postoperative follow-up was 40 months (range, 12 to 103 mo). Radiographic union and clinical outcomes, including the ranges of wrist motion, grip strength, and the modified Mayo wrist score, were evaluated. Results Union was achieved in 18 of 21 wrists (86%) at a mean time of 14 weeks after surgery (range, 8 to 28 wk). Nonunions with proximal fragments less than 20% of the total scaphoid healed in 6 of 8 wrists. In a subset of these 8 wrists in which the proximal fragment was less than 15%, healing occurred in 2 of 4. The modified Mayo wrist score significantly improved from 46 to 78 points, and final wrist functions were rated as excellent in 5, good in 5, fair in 10, and poor in 1. Ranges of motion and grip strengths did not show significant changes after surgery. Conclusions Vascularized distal Radius Bone grafting and K-wire fixation can heal scaphoid nonunions with small avascular proximal fragments, although motion and grip strength remain unchanged. Healing may be related to the size of the proximal pole fragment. Type of study/level of evidence Therapeutic IV.

Wang Zhi-long - One of the best experts on this subject based on the ideXlab platform.

  • Distal Radius Bone graft pedicled on palmar branch of the radial artery for treatment of fresh unstable scaphoid fractures
    Chinese Journal of Hand Surgery, 2005
    Co-Authors: Wang Zhi-long
    Abstract:

    Objective To introduce the methods and results of distal Radius Bone graft pedicled on palmar branch of the radial artery for treatment of fresh unstable scaphoid fractures. Methods According to the anatomic basis of blood supply of the distal Radius, vascularized Bone graft from the distal Radius based on pedicle of palmar branch of the radial artery was designed. Since 2000, 12 consecutive cases of fresh unstable scaphoid fractures were treated with AO cannulated screw fixation and the vascularized Bone graft. Follow-up ranged from 7 to 35 months, with an average of 18.6 months. Results Bone union was seen 2 to 3 months following the surgery in all patients. 100% healing was achieved. Range of motion of the wrist was 60°flexion/50°extension in 1 case, and 70°~80°flexion/45°~55°extension in the rest 11 cases. Wrist motion was pain free. Conclusion Palmar branch of the radial artery is anatomically constant and has a decent dissectable distance. The Bone flap from the distal Radius based on this pedicle has reliable blood suDpl and is suitable to treat fresh unstable scaphoid fractures.