Lack of Correlation between Ulnar Variance and Carpal Bone Angles on Lateral Radiographs in Normal Wrists

We conducted a retrospective review of 11 patients with bilateral Kienböck’s disease from our series of 251 patients with Kienböck’s disease. There were no significant differences in radiographic parameters, including ulnar variance and carpal bone angle, between those with unilateral and those with bilateral Kienböck’s disease. None of the patients with bilateral disease had been treated with corticosteroids or had a systemic disease that predisposed to osteonecrosis. Thus, this study failed to demonstrate any risk factor for bilateral, as opposed to unilateral Kienböck’s disease.

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Lack of Correlation between Ulnar Variance and Carpal Bone Angles on Lateral Radiographs in Normal Wrists

Acta Radiologica ◽

10.1080/02841859209173176 ◽

1992 ◽

Vol 33 (3) ◽

pp. 275-276

Author(s):

C. Falck Larsen ◽

S. Lindequist ◽

T. Bellstrøm

Keyword(s):

Ulnar Variance ◽

Carpal Bone

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Lack of Correlation between Ulnar Variance and Carpal Bone Angles on Lateral Radiographs in Normal Wrists

Acta Radiologica ◽

10.1177/028418519203300317 ◽

1992 ◽

Vol 33 (3) ◽

pp. 275-276 ◽

Cited By ~ 1

Author(s):

C. Falck Larsen ◽

S. Lindequist ◽

T. Bellstrøm

Keyword(s):

Correlation Coefficients ◽

Ulnar Variance ◽

Carpal Bone ◽

Predisposing Factor ◽

The Mean ◽

Ligamentous Instability

It has been proposed that negative ulnar variance is a predisposing factor to development of posttraumatic carpal ligamentous instability. However, this implies that no correlation exists between ulnar variance and carpal bone angles in the normal wrist. Carpal bone angles on lateral wrist radiographs and ulnar variance were measured in a series of 75 normal wrists. The mean ulnar variance was −0.03 mm (SD 1.56, range −5 to 5). The correlation coefficients were 0.06, −0.11, and −0.05 between the ulnar variance, and radiolunate, radioscaphoid, and scapholunate angles, respectively. A correlation between the carpal angles on lateral wrist radiographs, and ulnar variance in normal wrists could not be demonstrated, suggesting that the presence of negative ulnar variance may serve as an impartial clue to the presence of ligamentous instability.

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Secondary Fractures Following Internal Fixation in Two Horses

Veterinary and Comparative Orthopaedics and Traumatology ◽

10.1055/s-0038-1633209 ◽

1989 ◽

Vol 02 (03) ◽

pp. 125-128

Author(s):

E. M. Gaughan ◽

N. G. Duchar

Keyword(s):

Internal Fixation ◽

Sagittal Plane ◽

Proximal Phalanx ◽

Fracture Repair ◽

Fracture Line ◽

Carpal Bone ◽

Fracture Plane ◽

The Third ◽

Lag Screw ◽

Secondary Fractures

SummaryImplant associated fractures have not been reported in horses. Two horses were evaluated for fractures in the fore limbs, occurring subsequent to previous fracture repair. Previously, the horses had sustained fractures of unusual configurations which were repaired using internal fixation. Following repair and healing of the fractures, secondary fractures occurred in the same bone, but in a different (more common) configuration. The first horse was evaluated ten months following lag screw fixation of a longitudinal fracture of the proximal phalanx in a frontal plane. This horse presented with a more typical comminuted fracture in the sagittal plane with the screws from the first fixation lying in the fracture line. This fracture was successfully treated with a cast. The second horse was examined eightteen months after repair of a medial sagittal slab fracture of the third carpal bone. The horse presented with a more typical dorsal slab fracture of the third carpal bone with the previously placed lag screw lying in the fracture line. The screw was removed and a lag screw was placed perpendicular to the new fracture plane through the dorsal surface of the third carpal bone to repair the fracture.

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Carpal Bone Segmentation Using Fully Convolutional Neural Network

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405615666190724101600 ◽

2019 ◽

Vol 15 (10) ◽

pp. 983-989

Author(s):

Liang Kim Meng ◽

Azira Khalil ◽

Muhamad Hanif Ahmad Nizar ◽

Maryam Kamarun Nisham ◽

Belinda Pingguan-Murphy ◽

...

Keyword(s):

Neural Network ◽

Convolutional Neural Network ◽

Automatic Segmentation ◽

Ground Truth ◽

Bone Age ◽

Image Feature ◽

Qualitative Assessment ◽

Carpal Bone ◽

Radiographic Images ◽

Accurate Quantitative Analysis

Background: Bone Age Assessment (BAA) refers to a clinical procedure that aims to identify a discrepancy between biological and chronological age of an individual by assessing the bone age growth. Currently, there are two main methods of executing BAA which are known as Greulich-Pyle and Tanner-Whitehouse techniques. Both techniques involve a manual and qualitative assessment of hand and wrist radiographs, resulting in intra and inter-operator variability accuracy and time-consuming. An automatic segmentation can be applied to the radiographs, providing the physician with more accurate delineation of the carpal bone and accurate quantitative analysis. Methods: In this study, we proposed an image feature extraction technique based on image segmentation with the fully convolutional neural network with eight stride pixel (FCN-8). A total of 290 radiographic images including both female and the male subject of age ranging from 0 to 18 were manually segmented and trained using FCN-8. Results and Conclusion: The results exhibit a high training accuracy value of 99.68% and a loss rate of 0.008619 for 50 epochs of training. The experiments compared 58 images against the gold standard ground truth images. The accuracy of our fully automated segmentation technique is 0.78 ± 0.06, 1.56 ±0.30 mm and 98.02% in terms of Dice Coefficient, Hausdorff Distance, and overall qualitative carpal recognition accuracy, respectively.

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Comparison of the racing performance of Thoroughbreds with versus without osteochondral fragmentation of the accessory carpal bone identified on yearling sales repository radiographs

Journal of the American Veterinary Medical Association ◽

10.2460/javma.254.4.501 ◽

2019 ◽

Vol 254 (4) ◽

pp. 501-507

Author(s):

Alec J. Davern ◽

John G. Peloso ◽

Jan F. Hawkins ◽

George E. Moore ◽

James P. Morehead

Keyword(s):

Carpal Bone ◽

Racing Performance

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The triangular fibrocartilage complex on high-resolution 3 T MRI in healthy adolescents: the thin line between asymptomatic findings and pathology

Skeletal Radiology ◽

10.1007/s00256-021-03779-8 ◽

2021 ◽

Author(s):

Anne-Sophie van der Post ◽

Sjoerd Jens ◽

Frank F. Smithuis ◽

Miryam C. Obdeijn ◽

Roelof-Jan Oostra ◽

...

Keyword(s):

Signal Intensity ◽

Sagittal Plane ◽

Articular Surface ◽

Triangular Fibrocartilage Complex ◽

Ulnar Variance ◽

Observer Agreement ◽

Mri Findings ◽

Mri Features ◽

Triangular Fibrocartilage ◽

The Individual

Abstract Objective The objective of the study is to provide a reference for morphology, homogeneity, and signal intensity of triangular fibrocartilage complex (TFCC) and TFCC-related MRI features in adolescents. Materials and methods Prospectively collected data on asymptomatic participants aged 12–18 years, between June 2015 and November 2017, were retrospectively analyzed. A radiograph was performed in all participants to determine skeletal age and ulnar variance. A 3-T MRI followed to assess TFCC components and TFCC-related features. A standardized scoring form, based on MRI definitions used in literature on adults, was used for individual assessment of all participants by four observers. Results per item were expressed as frequencies (percentages) of observations by all observers for all participants combined (n = 92). Inter-observer agreement was determined by the unweighted Fleiss’ kappa with 95% confidence intervals (95% CI). Results The cohort consisted of 23 asymptomatic adolescents (12 girls and 11 boys). Median age was 13.5 years (range 12.0–17.0). Median ulnar variance was −0.7 mm (range − 2.7–1.4). Median triangular fibrocartilage (TFC) thickness was 1.4 mm (range 0.1–2.9). Diffuse increased TFC signal intensity not reaching the articular surface was observed in 30 (33%) observations and a vertical linear increased signal intensity with TFC discontinuation in 19 (20%) observations. Discontinuation between the volar radioulnar ligament and the TFC in the sagittal plane was seen in 23 (25%) observations. The extensor carpi ulnaris was completely dislocated in 10 (11%) observations, more frequent in supinated wrists (p = 0.031). Inter-observer agreement ranged from poor to fair for scoring items on the individual TFCC components. Conclusion MRI findings, whether normal variation or asymptomatic abnormality, can be observed in TFCC and TFCC-related features of asymptomatic adolescents. The rather low inter-observer agreement underscores the challenges in interpreting these small structures on MRI. This should be taken into consideration when interpreting clinical MRIs and deciding upon arthroscopy.

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