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J Carlsten - One of the best experts on this subject based on the ideXlab platform.
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sclerosis of the third Carpal Bone a prospective study of its significance in a group of young standardbred trotters
Acta Veterinaria Scandinavica, 2000Co-Authors: Henrik Uhlhorn, Per Eksell, B Sandgren, J CarlstenAbstract:: To assess the significance of radiographic signs of sclerosis of the third Carpal Bone (C3) in young Standardbred trotters in relation to performance, lameness and Bone turnover both carpi in 14 Standardbred trotters were radiographically and scintigraphically examined 6 times, from the beginning of speed training until the beginning of racing, between the mean ages of 20 and 42 months. At the end of the study 8 horses had raced in official qualifying races and 14 limbs in 11 horses had been diagnosed with Carpal lameness. All horses but 2 developed sclerosis and all but one had increased Bone turnover in the C3 area by scintigraphy. C3 sclerosis increased continuously over time and with increased performance. Carpal lameness was significantly associated with progression of sclerosis but in most cases sclerosis developed without concomitant signs of Carpal lameness. No association between Carpal lameness and increased scintigraphic uptake was found, but horses that had qualified for racing had significantly higher C3 to carpus ratio of radiopharmaceutical uptake. We conclude that there is a continuous increase in C3 radiographic sclerosis with time in young Standardbred trotters in professional training, but radiographic sclerosis appears to be of limited value as an indicator of clinical Carpal disease or level of performance in Standardbred trotters.
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retrospective study of subchondral sclerosis and lucency in the third Carpal Bone of standardbred trotters
Equine Veterinary Journal, 1999Co-Authors: Henrik Uhlhorn, J CarlstenAbstract:Summary The aim was to investigate radiographic findings of subchondral sclerosis and subchondral lucency in the dorsoproximal-dorsodistal (DPr-DDi) projection of the third Carpal Bone (C3) in relation to clinical appearance and to prognosis for racing. In a retrospective study, case records of 89 Standardbred trotters diagnosed with traumatic carpitis confirmed with intra-articular anaesthesia were examined. Records included data on degree of lameness at presentation and after flexion tests and a radiographic examination of the carpus, including a DPr-DDi projection of the C3. Subchondral lucency was found significantly to influence the degree of lameness at presentation and the time to start but did not significantly affect the chance of racing within 30 months post examination. In the present material no significant relationship between degree of sclerosis and lameness or prognosis for racing within 30 months was found, but the low number of C3 with severe sclerosis limited conclusions about that group.
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the accuracy of the dorsoproximal dorsodistal projection in assessing third Carpal Bone sclerosis in standardbred trotters
Veterinary Radiology & Ultrasound, 1998Co-Authors: Henrik Uhlhorn, Stina Ekman, Anne Haglund, J CarlstenAbstract:: Thirty-five Carpal joints from 20 standardbred trotters, age 1 to 7 years, all euthanized for nonorthopedic reasons, were examined to investigate the correlation between assessments of subchondral Bone sclerosis in the third Carpal Bone from radiographs in the dorsoproximal-dorsodistal (DPr-DDi) projection and histomorphometric Bone volume density measurements. The agreement between assessments of sclerosis from antemortem versus postmortem radiographs was also evaluated. Bones graded as sclerotic in the DPr-DDi projection had significantly higher Bone volume density values for all areas of measurement than nonsclerotic Bones. For sclerotic Bones, grading of sclerosis was significantly associated with volume density measurements in the central cancellous Bone only. There was a good agreement (Kw = 0.71) between assessments of radiographic Bone sclerosis from antemortem versus postmortem radiographs.
Joseph J. Crisco - One of the best experts on this subject based on the ideXlab platform.
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Carpal Bone size and scaling in men versus in women.
Journal of Hand Surgery (European Volume), 2020Co-Authors: Joseph J. Crisco, James C. Coburn, Douglas C Moore, Mohammad A. UpalAbstract:Purpose The purpose of this study was to quantify Carpal Bone size, to determine whether gender influences Carpal size, and to determine whether small and large Carpal Bones differ in size only by simple isometric scaling. Methods Cortical surfaces of all Carpal Bones in both wrists of 14 women and 14 men (ages 22–34 y) were reconstructed from computed tomography (CT) volume images. Carpal volume and bounding-box dimensions in 3 orthogonal directions were calculated and compared across genders. An average set of Carpal Bones were then scaled mathematically by a single factor in all directions (scaled isometrically) and compared across Carpal Bones of all sizes. Results Although female Carpal Bones were significantly smaller than male Carpal Bones, individual Carpal volume as a percentage of the volume of the entire carpus did not differ with gender. The 3 orthogonal bounding-box dimensions of the Carpal Bones scaled nearly isometrically from the smallest to the largest Bones. Conclusions Across the wide range of wrist sizes studied the individual Carpal volumes were a consistent percentage of carpus volume and this percentage did not differ with gender. Despite their complex shape the bounding dimensions of the Carpal Bones increased isometrically with increasing volume. The extensive database of dimensions provided in this study should be useful in the design and insertion of fixation systems and implants.
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Predicting Carpal Bone Kinematics Using an Expanded Digital Database of Wrist Carpal Bone Anatomy and Kinematics
Journal of Orthopaedic Research, 2019Co-Authors: Bardiya Akhbari, Douglas C Moore, David H. Laidlaw, Arnold-peter C. Weiss, Edward Akelman, Scott W. Wolfe, Joseph J. CriscoAbstract:The wrist can be considered a 2 degrees-of-freedom joint with all movements reflecting the combination of flexion-extension and radial-ulnar deviation. Wrist motions are accomplished by the kinematic reduction of the 42 degrees-of-freedom of the individual Carpal Bones. While previous studies have demonstrated the minimal motion of the scaphoid and lunate as the wrist moves along the dart-thrower's path or small relative motion between hamate-capitate-trapezoid, an understanding of the kinematics of the complete carpus across all wrist motions remains lacking. To address this, we assembled an open-source database of in vivo Carpal motions and developed mathematical models of the Carpal kinematics as a function of wrist motion. Quadratic surfaces were trained for each of the 42-Carpal Bone degrees-of-freedom and the goodness of fits were evaluated. Using the models, paths of wrist motion that generated minimal Carpal rotations or translations were determined. Model predictions were best for flexion-extension, radial-ulnar deviation, and volar-dorsal translations for all Carpal Bones with R 2 > 0.8, while the estimates were least effective for supination-pronation with R 2
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predicting Carpal Bone kinematics using an expanded digital database of wrist Carpal Bone anatomy and kinematics
Journal of Orthopaedic Research, 2019Co-Authors: Bardiya Akhbari, Douglas C Moore, David H. Laidlaw, Arnold-peter C. Weiss, Edward Akelman, Scott W. Wolfe, Joseph J. CriscoAbstract:The wrist can be considered a 2 degrees-of-freedom joint with all movements reflecting the combination of flexion-extension and radial-ulnar deviation. Wrist motions are accomplished by the kinematic reduction of the 42 degrees-of-freedom of the individual Carpal Bones. While previous studies have demonstrated the minimal motion of the scaphoid and lunate as the wrist moves along the dart-thrower's path or small relative motion between hamate-capitate-trapezoid, an understanding of the kinematics of the complete carpus across all wrist motions remains lacking. To address this, we assembled an open-source database of in vivo Carpal motions and developed mathematical models of the Carpal kinematics as a function of wrist motion. Quadratic surfaces were trained for each of the 42-Carpal Bone degrees-of-freedom and the goodness of fits were evaluated. Using the models, paths of wrist motion that generated minimal Carpal rotations or translations were determined. Model predictions were best for flexion-extension, radial-ulnar deviation, and volar-dorsal translations for all Carpal Bones with R 2 > 0.8, while the estimates were least effective for supination-pronation with R 2 < 0.6. The wrist path of motion's analysis indicated that the distal row of Carpal Bones moves rigidly together (<3° motion), along the anatomical axis of wrist motion, while the Bones in the proximal row undergo minimal motion when the wrist moves in a path oblique to the main axes. The open-source dataset along with its graphical user interface and mathematical models should facilitate clinical visualization and enable new studies of Carpal kinematics and function. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:2661-2670, 2019.
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Carpal Bone postures and motions are abnormal in both wrists of patients with unilateral scapholunate interosseous ligament tears
Journal of Hand Surgery (European Volume), 2003Co-Authors: Joseph J. Crisco, Arnold-peter C. Weiss, Edward Akelman, Sandi Pike, Dina L Hulsizergalvin, Scott W. WolfeAbstract:Abstract Purpose The recent ability to measure 3-dimensional in vivo Carpal kinematics has facilitated the noninvasive study of complex Carpal Bone motion. Methods In this study we examined the flexion/extension Carpal kinematics of both wrists in 8 patients with unilateral scapholunate interosseous ligament (SLIL) tears by using computed tomographic (CT) imaging and a markerless Bone registration technique. Carpal Bone neutral posture and flexion/extension motion of both wrists of the injured patients were compared with the same parameters in wrists of 10 uninjured male and female volunteers (normals). Results The neutral posture of the injured scaphoid and lunate were significantly more extended than those of normals. In these patients, however, the postures of the scaphoid and lunate in the contralateral uninjured wrists also were abnormal and were similar to those of the injured wrist. In addition, extension of the lunate and flexion of the scaphoid in both the injured and uninjured wrist were significantly different from normal but not different from each other. Conclusions This study was unable to attribute altered Carpal posture and motion to SLIL tears because abnormalities were found in both wrists of patients with unilateral injury. The etiology of abnormal wrist kinematics in the asymptomatic wrist of patients with unilateral tears of the scapholunate ligament is not known.
Scott W. Wolfe - One of the best experts on this subject based on the ideXlab platform.
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Predicting Carpal Bone Kinematics Using an Expanded Digital Database of Wrist Carpal Bone Anatomy and Kinematics
Journal of Orthopaedic Research, 2019Co-Authors: Bardiya Akhbari, Douglas C Moore, David H. Laidlaw, Arnold-peter C. Weiss, Edward Akelman, Scott W. Wolfe, Joseph J. CriscoAbstract:The wrist can be considered a 2 degrees-of-freedom joint with all movements reflecting the combination of flexion-extension and radial-ulnar deviation. Wrist motions are accomplished by the kinematic reduction of the 42 degrees-of-freedom of the individual Carpal Bones. While previous studies have demonstrated the minimal motion of the scaphoid and lunate as the wrist moves along the dart-thrower's path or small relative motion between hamate-capitate-trapezoid, an understanding of the kinematics of the complete carpus across all wrist motions remains lacking. To address this, we assembled an open-source database of in vivo Carpal motions and developed mathematical models of the Carpal kinematics as a function of wrist motion. Quadratic surfaces were trained for each of the 42-Carpal Bone degrees-of-freedom and the goodness of fits were evaluated. Using the models, paths of wrist motion that generated minimal Carpal rotations or translations were determined. Model predictions were best for flexion-extension, radial-ulnar deviation, and volar-dorsal translations for all Carpal Bones with R 2 > 0.8, while the estimates were least effective for supination-pronation with R 2
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predicting Carpal Bone kinematics using an expanded digital database of wrist Carpal Bone anatomy and kinematics
Journal of Orthopaedic Research, 2019Co-Authors: Bardiya Akhbari, Douglas C Moore, David H. Laidlaw, Arnold-peter C. Weiss, Edward Akelman, Scott W. Wolfe, Joseph J. CriscoAbstract:The wrist can be considered a 2 degrees-of-freedom joint with all movements reflecting the combination of flexion-extension and radial-ulnar deviation. Wrist motions are accomplished by the kinematic reduction of the 42 degrees-of-freedom of the individual Carpal Bones. While previous studies have demonstrated the minimal motion of the scaphoid and lunate as the wrist moves along the dart-thrower's path or small relative motion between hamate-capitate-trapezoid, an understanding of the kinematics of the complete carpus across all wrist motions remains lacking. To address this, we assembled an open-source database of in vivo Carpal motions and developed mathematical models of the Carpal kinematics as a function of wrist motion. Quadratic surfaces were trained for each of the 42-Carpal Bone degrees-of-freedom and the goodness of fits were evaluated. Using the models, paths of wrist motion that generated minimal Carpal rotations or translations were determined. Model predictions were best for flexion-extension, radial-ulnar deviation, and volar-dorsal translations for all Carpal Bones with R 2 > 0.8, while the estimates were least effective for supination-pronation with R 2 < 0.6. The wrist path of motion's analysis indicated that the distal row of Carpal Bones moves rigidly together (<3° motion), along the anatomical axis of wrist motion, while the Bones in the proximal row undergo minimal motion when the wrist moves in a path oblique to the main axes. The open-source dataset along with its graphical user interface and mathematical models should facilitate clinical visualization and enable new studies of Carpal kinematics and function. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:2661-2670, 2019.
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Carpal Bone postures and motions are abnormal in both wrists of patients with unilateral scapholunate interosseous ligament tears
Journal of Hand Surgery (European Volume), 2003Co-Authors: Joseph J. Crisco, Arnold-peter C. Weiss, Edward Akelman, Sandi Pike, Dina L Hulsizergalvin, Scott W. WolfeAbstract:Abstract Purpose The recent ability to measure 3-dimensional in vivo Carpal kinematics has facilitated the noninvasive study of complex Carpal Bone motion. Methods In this study we examined the flexion/extension Carpal kinematics of both wrists in 8 patients with unilateral scapholunate interosseous ligament (SLIL) tears by using computed tomographic (CT) imaging and a markerless Bone registration technique. Carpal Bone neutral posture and flexion/extension motion of both wrists of the injured patients were compared with the same parameters in wrists of 10 uninjured male and female volunteers (normals). Results The neutral posture of the injured scaphoid and lunate were significantly more extended than those of normals. In these patients, however, the postures of the scaphoid and lunate in the contralateral uninjured wrists also were abnormal and were similar to those of the injured wrist. In addition, extension of the lunate and flexion of the scaphoid in both the injured and uninjured wrist were significantly different from normal but not different from each other. Conclusions This study was unable to attribute altered Carpal posture and motion to SLIL tears because abnormalities were found in both wrists of patients with unilateral injury. The etiology of abnormal wrist kinematics in the asymptomatic wrist of patients with unilateral tears of the scapholunate ligament is not known.
Henrik Uhlhorn - One of the best experts on this subject based on the ideXlab platform.
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sclerosis of the third Carpal Bone a prospective study of its significance in a group of young standardbred trotters
Acta Veterinaria Scandinavica, 2000Co-Authors: Henrik Uhlhorn, Per Eksell, B Sandgren, J CarlstenAbstract:: To assess the significance of radiographic signs of sclerosis of the third Carpal Bone (C3) in young Standardbred trotters in relation to performance, lameness and Bone turnover both carpi in 14 Standardbred trotters were radiographically and scintigraphically examined 6 times, from the beginning of speed training until the beginning of racing, between the mean ages of 20 and 42 months. At the end of the study 8 horses had raced in official qualifying races and 14 limbs in 11 horses had been diagnosed with Carpal lameness. All horses but 2 developed sclerosis and all but one had increased Bone turnover in the C3 area by scintigraphy. C3 sclerosis increased continuously over time and with increased performance. Carpal lameness was significantly associated with progression of sclerosis but in most cases sclerosis developed without concomitant signs of Carpal lameness. No association between Carpal lameness and increased scintigraphic uptake was found, but horses that had qualified for racing had significantly higher C3 to carpus ratio of radiopharmaceutical uptake. We conclude that there is a continuous increase in C3 radiographic sclerosis with time in young Standardbred trotters in professional training, but radiographic sclerosis appears to be of limited value as an indicator of clinical Carpal disease or level of performance in Standardbred trotters.
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retrospective study of subchondral sclerosis and lucency in the third Carpal Bone of standardbred trotters
Equine Veterinary Journal, 1999Co-Authors: Henrik Uhlhorn, J CarlstenAbstract:Summary The aim was to investigate radiographic findings of subchondral sclerosis and subchondral lucency in the dorsoproximal-dorsodistal (DPr-DDi) projection of the third Carpal Bone (C3) in relation to clinical appearance and to prognosis for racing. In a retrospective study, case records of 89 Standardbred trotters diagnosed with traumatic carpitis confirmed with intra-articular anaesthesia were examined. Records included data on degree of lameness at presentation and after flexion tests and a radiographic examination of the carpus, including a DPr-DDi projection of the C3. Subchondral lucency was found significantly to influence the degree of lameness at presentation and the time to start but did not significantly affect the chance of racing within 30 months post examination. In the present material no significant relationship between degree of sclerosis and lameness or prognosis for racing within 30 months was found, but the low number of C3 with severe sclerosis limited conclusions about that group.
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the accuracy of the dorsoproximal dorsodistal projection in assessing third Carpal Bone sclerosis in standardbred trotters
Veterinary Radiology & Ultrasound, 1998Co-Authors: Henrik Uhlhorn, Stina Ekman, Anne Haglund, J CarlstenAbstract:: Thirty-five Carpal joints from 20 standardbred trotters, age 1 to 7 years, all euthanized for nonorthopedic reasons, were examined to investigate the correlation between assessments of subchondral Bone sclerosis in the third Carpal Bone from radiographs in the dorsoproximal-dorsodistal (DPr-DDi) projection and histomorphometric Bone volume density measurements. The agreement between assessments of sclerosis from antemortem versus postmortem radiographs was also evaluated. Bones graded as sclerotic in the DPr-DDi projection had significantly higher Bone volume density values for all areas of measurement than nonsclerotic Bones. For sclerotic Bones, grading of sclerosis was significantly associated with volume density measurements in the central cancellous Bone only. There was a good agreement (Kw = 0.71) between assessments of radiographic Bone sclerosis from antemortem versus postmortem radiographs.
William L Buford - One of the best experts on this subject based on the ideXlab platform.
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Carpal Bone anatomy measured by computer analysis of three dimensional reconstructions of computed tomography images
Journal of Hand Surgery (European Volume), 1995Co-Authors: Rita M Patterson, Karen W Elder, Steven F Viegas, William L BufordAbstract:Using quantitative analysis of three-dimensional reconstructions of computed tomography scan data, a normative database of Carpal Bone morphology was built. Thirfy-five wrists were imaged in a computed tomography scanner. Each slice was processed to determine the Bone edges and essembled as a three-dimensional model by stacking. Quantilative measurements of volume, surface area, maximum length, and interCarpal distances were then assessed. A reliable three-dimensional Carpal height ratio was calculated by dividing the Carpal height (minimum distance between the fourth metaCarpal and the radius) by the capitate maximum length. For volume, maximum length, and surface area, the order for the eight, Carpal Bones with respect to size (in descending order) were: capitate, hamate, scaphoid, trapezium, lunate, trapezoid, triquetrum, and pisiform. Male wrists were significantly larger than female wrists. There were no significant differences in the relative dimensions between left and right wrists, or between left and right wrists of matched pairs. This technology offers automated analysis of three-dimensional geometric Carpal information and the opportunity to obtain a body of information about normal and abnormal morphology as well as spatial relationships between Carpal Bones.