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Fred Johnstone - One of the best experts on this subject based on the ideXlab platform.

  • guyon s canal lipoma causing ulnar neuropathy
    American Journal of Roentgenology, 2002
    Co-Authors: Liem T Buimansfield, Morgan Williamson, Darren T Wheeler, Fred Johnstone
    Abstract:

    64-year-old man presented with a chronic history of ulnar-sided pain and paresthesia in his left hand. The physical examination revealed a soft-tissue mass in the Palmar aspect of the wrist. Radiographs showed a radiolucent soft-tissue mass in the volar aspect of the wrist (Fig. 1A). The MR examination revealed a lipomatous mass in Guyon’s canal that splayed the ulnar artery and nerve and displaced the Carpal tunnel radially (Figs. 1B and 1C). The mass was completely excised. Histology showed mature adipose tissue consistent with a lipoma (Fig. 1D). Guyon’s canal is also known as the “pisohamate tunnel” or the “distal ulnar tunnel.” The roof of the tunnel consists of the Palmar Carpal Ligament, the Palmaris brevis, and the hypothenar fat and fibrous tissue. The tendons of the flexor digitorum profundus, the transverse Carpal Ligament, the pisohamate and pisometaCarpal Ligaments, and the opponens digiti minimi form the floor of the tunnel. The medial wall includes the flexor carpi ulnaris, the pisiform, and the abductor digiti minimi manus. The tendons of the extrinsic flexors, the transverse Carpal Ligament, and the hook of the hamate constitute the lateral wall. Guyon’s canal consists of three zones. Zone 1 extends from the proximal edge of the Palmar Carpal Ligament to the bifurcation of the ulnar nerve. Zones 2 and 3 are adjacent to each other, extending from the bifurcation of the ulnar nerve just distal to the fibrous arch of the hypothenar muscles. These zones contain the deep motor branch and the superficial sensory branch of the ulnar nerve, respectively. Clinical symptoms correlate with the zone in which ulnar nerve compression occurs: combined motor and sensory deficits occur in zone 1 lesions; pure motor deficits, in zone 2 lesions; and isolated sensory deficits, in zone 3 lesions. Compressive neuropathies of the ulnar nerve occur most commonly at the elbow and less commonly at the wrist [1]. The most common causes of ulnar nerve compression at the wrist are ganglia, fractures, anomalous muscles, thrombosis, bursitis, and a thickened pisohamate Ligament [2]. Repeated blunt trauma to the hypothenar area may cause ulnar neuritis,

I. M. Wright - One of the best experts on this subject based on the ideXlab platform.

  • Observations on the anatomy and pathology of the Palmar interCarpal Ligaments in the middle Carpal joints of thoroughbred racehorses.
    Equine veterinary journal, 1994
    Co-Authors: T. J. Phillips, I. M. Wright
    Abstract:

    Summary Ten carpi from juvenile Thoroughbred horses were dissected in detail to record the anatomy of the Palmar interCarpal Ligaments (PICLs). These were found not to be substantially attached to the Palmar Carpal Ligament. The lateral PICL was sited at the convergence of the Palmar aspects of the third, fourth, intermediate and ulnar Carpal bones and aligned predominantly in a proximodistal direction. The medial PICL had a large origin distally on the lateral aspect of the radial Carpal bone (Cr) and attached to third (C3) and second (C2) Carpal bones with apparently separate fibre orientations. Fibres between Cr and C3 aligned obliquely from dorsoproximomedial to Palmarodistolaterai which corresponds to the direction of movement of Cr relative to C3 during Carpal extension. Video recordings of arthroscopic evaluations of 67 middle Carpal joints of juvenile Thoroughbred horses in race training were reviewed retrospectively and the osteochondral and Ligamentous pathology visible in each recorded. Damage to the Cr-C3 part of the medial PICL was present in 47 (70%) joints and, in 6 joints, comprised complete rupture of this branch. A significant (P

Vanessa Junko Yamaguti Miada - One of the best experts on this subject based on the ideXlab platform.

  • Didatic approach of ultrasonographic examination for evaluation of the Carpal joint in horses
    Ciência Rural, 2017
    Co-Authors: Maria Cristina Ferrarini Nunes Soares Hage, Mariana Sachi Invernizzi, Gabriela Monaldo Corrá Bellegard, Renata Gebara Sampaio Dória, Silke Verena Schwarzbach, Vanessa Junko Yamaguti Miada
    Abstract:

    portuguesO carpo e uma articulacao complexa que, com frequencia, e sede das doencas que acometem cavalos atletas. O objetivo deste estudo foi sugerir uma abordagem didatica para o treinamento de exame ultrassonografico do carpo em equinos. Foi realizado o exame ultrassonografico de um equino higido de catorze anos, as imagens foram comparadas com uma peca anatomica dissecada da mesma regiao de um cadaver de equino senior e com dados da literatura. As estruturas passiveis de identificacao foram: (dorsal) tendao do musculo extensor carporradial, tendao do musculo extensor obliquo do carpo, tendao do musculo extensor digital comum, recessos sinoviais dorsais, capsula articular, coxim de gordura, (lateral) tendao do musculo extensor digital lateral, Ligamento colateral lateral (componente profundo e superficial), (medial) Ligamento colateral medial (componente profundo e superficial), (Palmar) Ligamento intercarpiano Palmar, bainha Carpal, canal Carpal, tendao do musculo flexor digital superficial, origem proximal do tendao do musculo flexor digital profundo e o Ligamento Carpal Palmar. O conhecimento previo da anatomia associada ao estudo em pecas anatomicas sao elementos essenciais para o reconhecimento das estruturas musculoesqueleticas ao ultrassom, contribuindo para o treinamento e processo de aprendizagem. Palavras-chave: cavalos; ensino; ossos; tendoes; ultrassom EnglishThe carpus is a complex articulation, which is often involved in injuries in equine athletes. The objective of this study was to suggest a didactic approach for ultrasonography training for the examination of the Carpal joint in horses. Ultrasonograhy examination was performed in a healthy 14-year-old horse. The images were compared with those of a dissected anatomic specimen of the Carpal region of a senior horse and with those reported in the literature. Identifiable structures were as follows: (dorsal) tendon of the muscle extensor carpi radialis, tendon of the muscle extensor carpi obliquus, tendon of the muscle commom digital extensor, dorsal synovial outpouchings, joint capsule and fat cushion, (lateral) tendon of the muscle lateral digital extensor, lateral collateral Ligament (deep and superficial components), (medial) medial collateral Ligament (deep and superficial components) and (Palmar) Palmar interCarpal Ligament, Carpal sheath, Carpal tunnel, superficial digital flexor tendon, proximal origin of the deep digital flexor tendon, and Palmar Carpal Ligament. Prior knowledge of the anatomy in combination with the study of anatomical specimens is essential for recognizing musculoskeletal structures during ultrasound examination, contributing to the training and learning processes. Key words: horses; education; bones; tendons; ultrasonography

  • Didatic approach of ultrasonographic examination for evaluation of the Carpal joint in horses
    Universidade Federal de Santa Maria, 2017
    Co-Authors: Maria Cristina Ferrarini Nunes Soares Hage, Mariana Sachi Invernizzi, Gabriela Monaldo Corrá Bellegard, Renata Gebara Sampaio Dória, Silke Verena Schwarzbach, Vanessa Junko Yamaguti Miada
    Abstract:

    ABSTRACT: The carpus is a complex articulation, which is often involved in injuries in equine athletes. The objective of this study was to suggest a didactic approach for ultrasonography training for the examination of the Carpal joint in horses. Ultrasonograhy examination was performed in a healthy 14-year-old horse. The images were compared with those of a dissected anatomic specimen of the Carpal region of a senior horse and with those reported in the literature. Identifiable structures were as follows: (dorsal) tendon of the muscle extensor carpi radialis, tendon of the muscle extensor carpi obliquus, tendon of the muscle commom digital extensor, dorsal synovial outpouchings, joint capsule and fat cushion, (lateral) tendon of the muscle lateral digital extensor, lateral collateral Ligament (deep and superficial components), (medial) medial collateral Ligament (deep and superficial components) and (Palmar) Palmar interCarpal Ligament, Carpal sheath, Carpal tunnel, superficial digital flexor tendon, proximal origin of the deep digital flexor tendon, and Palmar Carpal Ligament. Prior knowledge of the anatomy in combination with the study of anatomical specimens is essential for recognizing musculoskeletal structures during ultrasound examination, contributing to the training and learning processes

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

  • guyon s canal lipoma causing ulnar neuropathy
    American Journal of Roentgenology, 2002
    Co-Authors: Liem T Buimansfield, Morgan Williamson, Darren T Wheeler, Fred Johnstone
    Abstract:

    64-year-old man presented with a chronic history of ulnar-sided pain and paresthesia in his left hand. The physical examination revealed a soft-tissue mass in the Palmar aspect of the wrist. Radiographs showed a radiolucent soft-tissue mass in the volar aspect of the wrist (Fig. 1A). The MR examination revealed a lipomatous mass in Guyon’s canal that splayed the ulnar artery and nerve and displaced the Carpal tunnel radially (Figs. 1B and 1C). The mass was completely excised. Histology showed mature adipose tissue consistent with a lipoma (Fig. 1D). Guyon’s canal is also known as the “pisohamate tunnel” or the “distal ulnar tunnel.” The roof of the tunnel consists of the Palmar Carpal Ligament, the Palmaris brevis, and the hypothenar fat and fibrous tissue. The tendons of the flexor digitorum profundus, the transverse Carpal Ligament, the pisohamate and pisometaCarpal Ligaments, and the opponens digiti minimi form the floor of the tunnel. The medial wall includes the flexor carpi ulnaris, the pisiform, and the abductor digiti minimi manus. The tendons of the extrinsic flexors, the transverse Carpal Ligament, and the hook of the hamate constitute the lateral wall. Guyon’s canal consists of three zones. Zone 1 extends from the proximal edge of the Palmar Carpal Ligament to the bifurcation of the ulnar nerve. Zones 2 and 3 are adjacent to each other, extending from the bifurcation of the ulnar nerve just distal to the fibrous arch of the hypothenar muscles. These zones contain the deep motor branch and the superficial sensory branch of the ulnar nerve, respectively. Clinical symptoms correlate with the zone in which ulnar nerve compression occurs: combined motor and sensory deficits occur in zone 1 lesions; pure motor deficits, in zone 2 lesions; and isolated sensory deficits, in zone 3 lesions. Compressive neuropathies of the ulnar nerve occur most commonly at the elbow and less commonly at the wrist [1]. The most common causes of ulnar nerve compression at the wrist are ganglia, fractures, anomalous muscles, thrombosis, bursitis, and a thickened pisohamate Ligament [2]. Repeated blunt trauma to the hypothenar area may cause ulnar neuritis,

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

  • Observations on the anatomy and pathology of the Palmar interCarpal Ligaments in the middle Carpal joints of thoroughbred racehorses.
    Equine veterinary journal, 1994
    Co-Authors: T. J. Phillips, I. M. Wright
    Abstract:

    Summary Ten carpi from juvenile Thoroughbred horses were dissected in detail to record the anatomy of the Palmar interCarpal Ligaments (PICLs). These were found not to be substantially attached to the Palmar Carpal Ligament. The lateral PICL was sited at the convergence of the Palmar aspects of the third, fourth, intermediate and ulnar Carpal bones and aligned predominantly in a proximodistal direction. The medial PICL had a large origin distally on the lateral aspect of the radial Carpal bone (Cr) and attached to third (C3) and second (C2) Carpal bones with apparently separate fibre orientations. Fibres between Cr and C3 aligned obliquely from dorsoproximomedial to Palmarodistolaterai which corresponds to the direction of movement of Cr relative to C3 during Carpal extension. Video recordings of arthroscopic evaluations of 67 middle Carpal joints of juvenile Thoroughbred horses in race training were reviewed retrospectively and the osteochondral and Ligamentous pathology visible in each recorded. Damage to the Cr-C3 part of the medial PICL was present in 47 (70%) joints and, in 6 joints, comprised complete rupture of this branch. A significant (P