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Showzow Tsujio - One of the best experts on this subject based on the ideXlab platform.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    International Conference on Robotics and Automation, 2003
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    /sup F/or dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism, called the strain-deformation expansion mechanism, to sense the Joint torque, which is small enough and fitted in the Finger Joint. By the torque sensing mechanism, the small Joint strain-deformation used for torque sensing can be expanded without reducing the Joint stiffness. In this paper, the torque sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint shaft theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a design method for realizing the sensing mechanism with high sensitivity is discussed. Finally, some experiments with robot Finger are performed to show the basic characteristics and the effectiveness of the proposed torque sensing mechanism.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    IEEE International Conference on Robotics Intelligent Systems and Signal Processing, 2003
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    For dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism called strain-deformation expansion mechanism to sense the Joint torque, which is small enough and fitted in the Finger Joint. The torque sensing mechanism can expand the small Joint strain-deformation used for torque sensing expanded without reducing the Joint stiffness. In this paper, the torque sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint shaft theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a design method for realizing the sensing mechanism with high sensitivity is discussed. Lastly, some experiments with robot Finger are performed to show the basic characteristics and the effectiveness of the proposed torque sensing mechanism.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    Journal of the Robotics Society of Japan, 2002
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    For dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism calledStrain-Deformation Expansion Mechanismto sense the Joint torque, which is small enough and fitted in the Finger Joint. By the torque-sensing mechanism, the small Joint strain deformation used for torque sensing can be expanded without reducing the Joint stiffness. In this paper, the torque-sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint axis theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a method for realizing the sensing mechanism with high sensitivity is discussed. Lastly, some experiments with robot Finger are performed to show the basic characteristcs and the effectiveness of the proposed torque-sensing mechanism.

T Ishitsuka - One of the best experts on this subject based on the ideXlab platform.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    International Conference on Robotics and Automation, 2003
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    /sup F/or dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism, called the strain-deformation expansion mechanism, to sense the Joint torque, which is small enough and fitted in the Finger Joint. By the torque sensing mechanism, the small Joint strain-deformation used for torque sensing can be expanded without reducing the Joint stiffness. In this paper, the torque sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint shaft theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a design method for realizing the sensing mechanism with high sensitivity is discussed. Finally, some experiments with robot Finger are performed to show the basic characteristics and the effectiveness of the proposed torque sensing mechanism.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    IEEE International Conference on Robotics Intelligent Systems and Signal Processing, 2003
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    For dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism called strain-deformation expansion mechanism to sense the Joint torque, which is small enough and fitted in the Finger Joint. The torque sensing mechanism can expand the small Joint strain-deformation used for torque sensing expanded without reducing the Joint stiffness. In this paper, the torque sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint shaft theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a design method for realizing the sensing mechanism with high sensitivity is discussed. Lastly, some experiments with robot Finger are performed to show the basic characteristics and the effectiveness of the proposed torque sensing mechanism.

  • torque sensing of Finger Joint using strain deformation expansion mechanism
    Journal of the Robotics Society of Japan, 2002
    Co-Authors: T Ishitsuka, Showzow Tsujio
    Abstract:

    For dexterously performing object grasping and manipulation with multiFingered hand of robot, sensing the Finger Joint torque is required. In general, the size of Finger Joint is quite small so that it is hard to realize the torque sensing. This paper proposes a novel mechanism calledStrain-Deformation Expansion Mechanismto sense the Joint torque, which is small enough and fitted in the Finger Joint. By the torque-sensing mechanism, the small Joint strain deformation used for torque sensing can be expanded without reducing the Joint stiffness. In this paper, the torque-sensing principle is addressed by analyzing the deformation of the sensing mechanism and the torques acting on the Joint axis theoretically. Then, the sensitivity of the sensing mechanism and its expansion rate of sensitivity are defined, and a method for realizing the sensing mechanism with high sensitivity is discussed. Lastly, some experiments with robot Finger are performed to show the basic characteristcs and the effectiveness of the proposed torque-sensing mechanism.

Megumi Matsuhashi - One of the best experts on this subject based on the ideXlab platform.

  • positive synovial vascularity in patients with low disease activity indicates smouldering inflammation leading to Joint damage in rheumatoid arthritis time integrated Joint inflammation estimated by synovial vascularity in each Finger Joint
    Rheumatology, 2013
    Co-Authors: Jun Fukae, Masato Isobe, Akemi Kitano, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Akio Mitsuzaki, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi
    Abstract:

    Objective. To investigate the relationship between synovial vascularity and Joint damage progression in each Finger Joint of patients with RA under low disease activity during treatment with biologic agents. Methods. We studied 310 MCP and 310 PIP Joints of 31 patients with active RA who were administered adalimumab (ADA) or tocilizumab (TCZ). Patients were examined with clinical and laboratory assessments. Power Doppler sonography was performed at baseline and at weeks 8, 20 and 40. Synovial vascularity was evaluated according to quantitative measurement. Hand and foot radiography was performed at baseline and at week 50. Results. Composite scores of the DAS with 28 Joints and the Simplified Disease Activity Index (SDAI) were significantly decreased from baseline to week 8, being sustained at a low level by biologic agents during the observational period. MCP and PIP Joints with positive synovial vascularity after week 8 showed more subsequent Joint damage progression than Joints without synovial vascularity throughout the follow-up. The changes in radiographic progression in these Joints were independent of the sum of synovial vascularity from baseline to week 40 or the occasional occurrence of positive synovial vascularity. Conclusion. Smouldering inflammation reflected by positive synovial vascularity under low disease activity was linked to Joint damage. The damage progressed irrespective of the severity of positive synovial vascularity. Even with a favourable overall therapeutic response, monitoring of synovial vascularity has the potential to provide useful Joint information to tailor treatment strategies. Trial registration. University Hospital Medical Information Network Clinical Trials Registry; http://www. umin.ac.jp/ctr/; UMIN000004476.

  • radiographic prognosis of Finger Joint damage predicted by early alteration in synovial vascularity in patients with rheumatoid arthritis potential utility of power doppler sonography in clinical practice
    Arthritis Care and Research, 2011
    Co-Authors: Jun Fukae, Masato Isobe, Akemi Kitano, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Akio Mitsuzaki, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi
    Abstract:

    Objective To investigate the relationship between synovial vascularity and progression of structural bone damage in each Finger Joint in patients with rheumatoid arthritis (RA) and to demonstrate synovial vascularity as a potential therapeutic marker. Methods We studied 250 metacarpophalangeal (MCP) and 250 proximal interphalangeal (PIP) Joints of 25 patients with active RA who were administered adalimumab or tocilizumab. Patients were examined with clinical and laboratory assessments. Power Doppler sonography was performed at baseline and at the fourth and eighth weeks. Synovial vascularity was evaluated according to quantitative measurement. Hand and foot radiography was performed at baseline and the twentieth week. Results Clinical indices such as the 28-Joint Disease Activity Score, the Clinical Disease Activity Index, and the Simplified Disease Activity Index were significantly decreased by biologic agents. The MCP and PIP Joints with no response in synovial vascularity between baseline and the eighth week (vascularity improvement of ≤70% at the eighth week) showed a higher risk of radiographic progression compared with responsive Joints (vascularity improvement of >70% at the eighth week; relative risk 2.33–9). Radiographic progression at the twentieth week was significantly lower in responsive Joints than in nonresponsive Joints. Conclusion The improvement of synovial vascularity following treatment with biologic agents led to suppression of radiographic progression of RA in each Finger Joint. The alteration in synovial vascularity numerically reflected therapeutic efficacy. Using vascularity as a marker to determine the most suitable therapeutic approach would be beneficial for patients with active RA.

  • change of synovial vascularity in a single Finger Joint assessed by power doppler sonography correlated with radiographic change in rheumatoid arthritis comparative study of a novel quantitative score with a semiquantitative score
    Arthritis Care and Research, 2010
    Co-Authors: Jun Fukae, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi, Tamotsu Kamishima, Tatsuya Atsumi, Takao Koike
    Abstract:

    OBJECTIVE: To investigate the relationship between synovial vascularity assessed by quantitative power Doppler sonography (PDS) and progression of structural bone damage in a single Finger Joint in patients with rheumatoid arthritis (RA). METHODS: We studied 190 metacarpophalangeal (MCP) Joints and 190 proximal interphalangeal (PIP) Joints of 19 patients with active RA who had initial treatment with disease-modifying antirheumatic drugs (DMARDs). Patients were examined by clinical and laboratory assessments throughout the study. Hand and foot radiography was performed at baseline and the twentieth week. Magnetic resonance imaging (MRI) was performed at baseline. PDS was performed at baseline and the eighth week. Synovial vascularity was evaluated according to both quantitative and semiquantitative methods. RESULTS: Quantitative PDS was significantly correlated with the enhancement rate of MRI in each single Finger Joint. Comparing quantitative synovial vascularity and radiographic change in single MCP or PIP Joints, the level of vascularity at baseline showed a significant positive correlation with radiographic progression at the twentieth week. The change of vascularity in response to DMARDs, defined as the percentage change in vascularity by the eighth week from baseline, was inversely correlated with radiographic progression in each MCP Joint. The quantitative PDS method was more useful than the semiquantitative method for the evaluation of synovial vascularity in a single Finger Joint. CONCLUSION: The change of synovial vascularity in a single Finger Joint determined by quantitative PDS could numerically predict its radiographic progression. Using vascularity as a guide to consider a therapeutic approach would have benefits for patients with active RA.

Jun Fukae - One of the best experts on this subject based on the ideXlab platform.

  • positive synovial vascularity in patients with low disease activity indicates smouldering inflammation leading to Joint damage in rheumatoid arthritis time integrated Joint inflammation estimated by synovial vascularity in each Finger Joint
    Rheumatology, 2013
    Co-Authors: Jun Fukae, Masato Isobe, Akemi Kitano, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Akio Mitsuzaki, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi
    Abstract:

    Objective. To investigate the relationship between synovial vascularity and Joint damage progression in each Finger Joint of patients with RA under low disease activity during treatment with biologic agents. Methods. We studied 310 MCP and 310 PIP Joints of 31 patients with active RA who were administered adalimumab (ADA) or tocilizumab (TCZ). Patients were examined with clinical and laboratory assessments. Power Doppler sonography was performed at baseline and at weeks 8, 20 and 40. Synovial vascularity was evaluated according to quantitative measurement. Hand and foot radiography was performed at baseline and at week 50. Results. Composite scores of the DAS with 28 Joints and the Simplified Disease Activity Index (SDAI) were significantly decreased from baseline to week 8, being sustained at a low level by biologic agents during the observational period. MCP and PIP Joints with positive synovial vascularity after week 8 showed more subsequent Joint damage progression than Joints without synovial vascularity throughout the follow-up. The changes in radiographic progression in these Joints were independent of the sum of synovial vascularity from baseline to week 40 or the occasional occurrence of positive synovial vascularity. Conclusion. Smouldering inflammation reflected by positive synovial vascularity under low disease activity was linked to Joint damage. The damage progressed irrespective of the severity of positive synovial vascularity. Even with a favourable overall therapeutic response, monitoring of synovial vascularity has the potential to provide useful Joint information to tailor treatment strategies. Trial registration. University Hospital Medical Information Network Clinical Trials Registry; http://www. umin.ac.jp/ctr/; UMIN000004476.

  • radiographic prognosis of Finger Joint damage predicted by early alteration in synovial vascularity in patients with rheumatoid arthritis potential utility of power doppler sonography in clinical practice
    Arthritis Care and Research, 2011
    Co-Authors: Jun Fukae, Masato Isobe, Akemi Kitano, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Akio Mitsuzaki, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi
    Abstract:

    Objective To investigate the relationship between synovial vascularity and progression of structural bone damage in each Finger Joint in patients with rheumatoid arthritis (RA) and to demonstrate synovial vascularity as a potential therapeutic marker. Methods We studied 250 metacarpophalangeal (MCP) and 250 proximal interphalangeal (PIP) Joints of 25 patients with active RA who were administered adalimumab or tocilizumab. Patients were examined with clinical and laboratory assessments. Power Doppler sonography was performed at baseline and at the fourth and eighth weeks. Synovial vascularity was evaluated according to quantitative measurement. Hand and foot radiography was performed at baseline and the twentieth week. Results Clinical indices such as the 28-Joint Disease Activity Score, the Clinical Disease Activity Index, and the Simplified Disease Activity Index were significantly decreased by biologic agents. The MCP and PIP Joints with no response in synovial vascularity between baseline and the eighth week (vascularity improvement of ≤70% at the eighth week) showed a higher risk of radiographic progression compared with responsive Joints (vascularity improvement of >70% at the eighth week; relative risk 2.33–9). Radiographic progression at the twentieth week was significantly lower in responsive Joints than in nonresponsive Joints. Conclusion The improvement of synovial vascularity following treatment with biologic agents led to suppression of radiographic progression of RA in each Finger Joint. The alteration in synovial vascularity numerically reflected therapeutic efficacy. Using vascularity as a marker to determine the most suitable therapeutic approach would be beneficial for patients with active RA.

  • change of synovial vascularity in a single Finger Joint assessed by power doppler sonography correlated with radiographic change in rheumatoid arthritis comparative study of a novel quantitative score with a semiquantitative score
    Arthritis Care and Research, 2010
    Co-Authors: Jun Fukae, Mihoko Henmi, Fumihiko Sakamoto, Akihiro Narita, Masato Shimizu, Kazuhide Tanimura, Megumi Matsuhashi, Tamotsu Kamishima, Tatsuya Atsumi, Takao Koike
    Abstract:

    OBJECTIVE: To investigate the relationship between synovial vascularity assessed by quantitative power Doppler sonography (PDS) and progression of structural bone damage in a single Finger Joint in patients with rheumatoid arthritis (RA). METHODS: We studied 190 metacarpophalangeal (MCP) Joints and 190 proximal interphalangeal (PIP) Joints of 19 patients with active RA who had initial treatment with disease-modifying antirheumatic drugs (DMARDs). Patients were examined by clinical and laboratory assessments throughout the study. Hand and foot radiography was performed at baseline and the twentieth week. Magnetic resonance imaging (MRI) was performed at baseline. PDS was performed at baseline and the eighth week. Synovial vascularity was evaluated according to both quantitative and semiquantitative methods. RESULTS: Quantitative PDS was significantly correlated with the enhancement rate of MRI in each single Finger Joint. Comparing quantitative synovial vascularity and radiographic change in single MCP or PIP Joints, the level of vascularity at baseline showed a significant positive correlation with radiographic progression at the twentieth week. The change of vascularity in response to DMARDs, defined as the percentage change in vascularity by the eighth week from baseline, was inversely correlated with radiographic progression in each MCP Joint. The quantitative PDS method was more useful than the semiquantitative method for the evaluation of synovial vascularity in a single Finger Joint. CONCLUSION: The change of synovial vascularity in a single Finger Joint determined by quantitative PDS could numerically predict its radiographic progression. Using vascularity as a guide to consider a therapeutic approach would have benefits for patients with active RA.

Christian Ries - One of the best experts on this subject based on the ideXlab platform.

  • operative treatment of dupuytren s contracture arthrolysis of the proximal interphalangeal Finger Joint
    Orthopade, 2017
    Co-Authors: B Hohendorff, C K Spies, L P Muller, J Franke, Frank Unglaub, Christian Ries
    Abstract:

    Background In the operative treatment of Dupuytren's disease, in certain cases proximal interphalangeal Joint flexion contracture remains after fasciectomy due to shrinkage, shortening, and/or adhesion of the periarticular structures. Objectives How can a residual flexion contracture of the proximal interphalangeal Joint after partial fasciectomy in Dupuytren's disease be treated surgically and what follow-up results can be expected? Methods Description of anatomy, indication, surgical technique of arthrolysis of the proximal interphalangeal Joint, postoperative treatment, and critical analysis of the results reported in the literature. Results Arthrolysis of the proximal interphalangeal Joint is performed in up to six consecutive steps. An improvement of only about 50% compared to preoperative flexion contracture can be expected. Conclusions Despite alleged unsatisfactory results arthrolysis of the proximal interphalangeal Joint can be recommended in surgery of Dupuytren's disease. In certain cases, patient cooperation during lengthy postoperative treatment is necessary.

  • supplementary arthrolysis of the proximal interphalangeal Finger Joint in dupuytren s contracture primary operation versus revision
    Archives of Orthopaedic and Trauma Surgery, 2016
    Co-Authors: B Hohendorff, C K Spies, L P Muller, Christian Ries
    Abstract:

    In operative treatment of Dupuytren’s disease, in certain cases proximal interphalangeal Joint (PIP) flexion contracture remains after fasciectomy which can be corrected by a supplementary arthrolysis, but few data comparing primary and revision surgery are available. Fifteen patients who had a fasciectomy and supplementary PIP arthrolysis at the affected Finger for the first time were compared to 13 patients who had a revision fasciectomy with a supplementary PIP arthrolysis. Upon follow-up at 22 months, flexion contracture was measured and data were compared to the preoperative values. Patient satisfaction with the outcome of the operation was determined and patients completed the Disabilities of the Arm, Shoulder and Hand outcome measure questionnaire. Fingers of patients with Dupuytren’s disease that had a partial fasciectomy and supplementary arthrolysis of the PIP for the first time had a median residual PIP flexion contracture of 30° compared 39° of Fingers that had a partial fasciectomy and supplementary arthrolysis of the PIP as a revision. The patients of both groups were equally satisfied with the outcome of the operation, while their DASH scores were nearly identical. After a mean follow-up of 2 years, the outcome of recurrent PIP contracture is comparable in patients with Dupuytren’s disease that were treated by partial fasciectomy and supplementary arthrolysis for the first time and as a revision.

  • supplementary arthrolysis of the proximal interphalangeal Finger Joint in dupuytren s contracture primary operation versus revision
    Archives of Orthopaedic and Trauma Surgery, 2016
    Co-Authors: B Hohendorff, C K Spies, L P Muller, Christian Ries
    Abstract:

    Introduction In operative treatment of Dupuytren’s disease, in certain cases proximal interphalangeal Joint (PIP) flexion contracture remains after fasciectomy which can be corrected by a supplementary arthrolysis, but few data comparing primary and revision surgery are available.