The carpometacarpal joint of the thumb: MR appearance in asymptomatic volunteers

Hirschmann, Anna; Sutter, Reto; Schweizer, Andreas; Pfirrmann, Christian W. A.

doi:10.1007/s00256-013-1633-4

Cited by 17 publications

(8 citation statements)

References 30 publications

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“…44,46 The AOL was shown to be thicker in men (1.7 mm) than women (1.2 mm) on MRI. 47 Dynamic stress imaging of the AOL is performed by applying dorsally directed pressure to the volar base of the first metacarpal. 11…”

Section: Relevant Anatomymentioning

confidence: 99%

“…It is more often combined with a fracture of the first metacarpal base. 47 With Bennett fracture dislocation injuries, the deep AOL maintains its articular surface attachment to the proximal ulnar metacarpal fragment, whereas the remainder of the metacarpal is pulled in a radial direction by the abductor pollicis longus, frequently resulting in wide diastasis of the articular surface. Less frequently, injury is due to a direct blow into the first web space of the thumb, such as may be produced by a motorcycle handlebar at impact.…”

Section: Biomechanicsmentioning

confidence: 99%

“…Incongruity of the articular surfaces seen with US may support clinical suspicion of joint instability. Because the TMC joint is not congruent at rest, 47 it may be difficult to recognize pathologic subluxation, and comparison with the contralateral asymptomatic side is often useful. Dorsally directed stress on the base of the first metacarpal may demonstrate increased joint incongruity and widening of volar TMC joint space secondary to metacarpal translation.…”

Section: Ultrasound Features Of Ligament Injurymentioning

confidence: 99%

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Ultrasound of Normal and Injured Ligaments and Retinacula of the Hand

McCarthy

2020

Semin Musculoskelet Radiol

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Clinical diagnosis of ligament and retinacular injuries of the hand may be challenging. Ultrasound (US) enables detailed high-resolution, dynamic, and real-time evaluation of these structures. This article is a comprehensive review of the intricate anatomy, optimal imaging technique, and normal US appearances of these ligaments and retinacula. The US features, pertinent biomechanics, clinical presentation, and differential diagnosis of injuries affecting the annular pulleys, differentiating from climber's finger; extensor hood including sagittal band and central slip rupture; proximal interphalangeal and metacarpophalangeal collateral ligaments including the Stener lesion and associated volar plate injury; and the anterior oblique or beak ligament of the trapeziometacarpal joint are reviewed. Emphasis is placed on optimal transducer positioning, value of dynamic US, injury severity, surgical indications, and other US findings with important management implications. US facilitates a timely accurate diagnosis of hand ligament and retinacular injury to ensure optimal patient management and minimize the risk of functional impairment of the hand.

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Section: Relevant Anatomymentioning

confidence: 99%

Section: Biomechanicsmentioning

confidence: 99%

Section: Ultrasound Features Of Ligament Injurymentioning

confidence: 99%

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Ultrasound of Normal and Injured Ligaments and Retinacula of the Hand

McCarthy

2020

Semin Musculoskelet Radiol

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“…The AOL is much thinner than the dorsal ligament complex but still functionally important. The term beak ligament is frequently used to refer to either the total AOL complex or the deep portion specifically (7). With Bennett fracture-dislocation injuries, the deep AOL maintains its articular surface attachment to the proximal ulnar metacarpal fragment, whereas the remainder of the metacarpal is pulled in a radial direction by the APL, frequently resulting in wide diastasis of the articular surface (4).…”

Section: Volar Ligamentsmentioning

confidence: 99%

“…The dorsal radial ligament and posterior oblique ligament together form the dorsal ligament complex, which acts as the primary restraint to dorsal radial metacarpal dislocation (1,4). The ligaments of the dorsal ligament complex may demonstrate internal intermediate signal intensity on images obtained in asymptomatic patients (7).…”

Section: Volar Ligamentsmentioning

confidence: 99%

High-Resolution MR Imaging and US Anatomy of the Thumb

Rawat¹,

Pierce²,

Evans³

et al. 2016

RadioGraphics

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Despite having many unique anatomic features relative to the other digits, the thumb has received little attention in the radiology literature. The thumb, with its opposable and prehensile abilities, enables fine manual dexterity. However, most radiologists have little familiarity with the structures that allow these dynamic movements, other than their recognition of the role of the ulnar collateral ligament in the setting of gamekeeper injury. High-resolution magnetic resonance (MR) imaging allows optimal assessment of the intricate soft-tissue anatomy of the thumb, which enables thumb flexion, extension, abduction, and adduction. Ultrasonography is a readily available, inexpensive tool that can supplement MR imaging in the evaluation of juxta-articular soft-tissue anatomy. Both imaging modalities are extremely useful for identifying the key ligaments responsible for stabilizing the first carpometacarpal and metacarpophalangeal joints. MR imaging is particularly important in assessment of these ligaments in both normal and trauma settings, which is essential for not only recognizing acute injuries but also becoming familiar with the morphologic variations that are potential pitfalls. To accurately and confidently diagnose abnormalities of these small soft-tissue structures, radiologists must have a clear understanding of the complexities associated with imaging the normal thumb anatomy. RSNA, 2016.

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Degradation of photovoltaic backsheets: Comparison of the aging induced changes on module and component level

Knausz

Eder

Voronko

et al. 2015

J of Applied Polymer Sci

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In reliability testing of components for PV modules an always remaining question is about material (in)compatibilities and synergistic effects and thus, how results of singly tested materials correlate with materials aged within PV modules. Testing of single materials would simplify sample preparation, reduce costs and offer more testing options. Therefore the main objective of this study was to compare the aging behavior of single backsheets with that of backsheets incorporated within PV modules. Four different types of backsheets were chosen, all of them comprising of polyethylene terephthalate (PET) core layers, but differing outer protection layers. Test modules using identical components, varying only in the type of backsheet used were produced and damp heat aged (85 C/85% RH 2000 h). The results revealed no influence of the PV module lamination on the thermal characteristics of the polymeric backsheets. Even after DH aging, differences between single and module laminated backsheets were negligible. Degradation effects of PET could be detected for all aged sheets by thermal analysis and were confirmed by tensile tests and rheological measurements. Thus, it can be stated that testing of single PET based backsheets under DH aging conditions is a practicable way to investigate the applicability of a new backsheet.

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The carpometacarpal joint of the thumb: MR appearance in asymptomatic volunteers

Cited by 17 publications

References 30 publications

Ultrasound of Normal and Injured Ligaments and Retinacula of the Hand

Ultrasound of Normal and Injured Ligaments and Retinacula of the Hand

High-Resolution MR Imaging and US Anatomy of the Thumb

Degradation of photovoltaic backsheets: Comparison of the aging induced changes on module and component level

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