Measurement of the Shift in the Distal Radioulnar Joint Using a Custom Platform

Deng, Jiuzheng; Gao, Tian; Wang, Lingyu

doi:10.1007/s12013-015-0653-1

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Compared with previous cadaveric studies, the amount of translation was lower because of the good dynamic stability through muscular contraction [17–19]. Although it is difficult to compare the results directly, the ratio of displacement to the force was about three quarters compared to the previous study [19]. This may be because the examination was performed with remaining the mobility of the radius.…”

Section: Discussionmentioning

confidence: 77%

Quantitative assessment of distal radioulnar joint stability with pressure-monitor ultrasonography

et al. 2019

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Background Diagnosing distal radioulnar joint (DRUJ) instability remains a challenge as it relies on physical examination. To quantitatively assess DRUJ stability, a pressure-monitor ultrasound system was developed. The objective of this study was to evaluate the force-displacement relationship of DRUJ in normal subjects. Methods Nine wrists of 9 asymptomatic volunteers were evaluated. The pressure-monitor ultrasound system was developed to apply pressure to the tissue with a pre-determined cycle and displacement of the transducer. Each subject was imaged sitting with the elbow flexed and forearm pronated. The dorsal surface of the distal radius and the center of the ulnar head were displayed at DRUJ level. The pressure toward palmar direction was applied to the distal ulna with different levels of transducer displacements, i.e., 1 mm, 2 mm, and 3 mm. The distance between the dorsal surface of the ulnar head and the dorsal surface of the distal radius was measured. The first measurement was performed at the initial position, and the second measurement was performed when the transducer pressed down the ulna to the degree that the ulnar head had shifted to the most palmar position. At the same time, the pressure to the transducer was measured. The changes of radioulnar distance (=the measurement at the most palmar position—the measurement at the initial position) and pressure, and pressure/distance ratio were compared among the different transducer displacements. Results The pressure was significantly increased as the transducer displacement became larger ( P < 0.01). The changes of radioulnar distance were smaller in the 1 mm displacement condition compared to the 2 and 3 mm displacement conditions ( P < 0.05). The pressure/distance ratio was larger in the 1 mm displacement condition compared to the 2 and 3 mm displacement conditions ( P < 0.05). Conclusions A method to assess DRUJ stability by measuring changes in radioulnar distance and force application was developed. It was found that the application of 2 mm displacement and 200 g force was the critical stress for the capsuloligamentous structures to start stabilizing DRUJ. This methodology and the indices may be clinically useful to investigate the mechanical properties of patients with DRUJ instability.

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Section: Discussionmentioning

confidence: 77%

Quantitative assessment of distal radioulnar joint stability with pressure-monitor ultrasonography

et al. 2019

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“…Several methods to quantify the DRUJ displacement have been reported in cadaver studies. [2][3][4][5][6] In addition, several clinical methods with computed tomography (CT) have quantified DRUJ stability, i.e., the radioulnar line method, the subluxation ratio method, the epicenter method and the radioulnar ratio method. [7][8][9][10][11][12] These methods measure radioulnar translation by evaluating the ulnar position relative to the radius position, resulting in a ratio.…”

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confidence: 99%

Reliability of Quantitative Assessment of Distal Radioulnar Joint Stability With Force‐Monitor Ultrasonography

Yuine

Yoshii

Tung

et al. 2019

Journal Orthopaedic Research

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The purpose of this study was to evaluate the reliability of ultrasound assessment of the displacement-force relationships for distal radioulnar joint (DRUJ) stability. Non-dominant wrists of 10 healthy male subjects were evaluated by force-monitor ultrasonography. This apparatus was developed to apply cyclic compression to the wrist with pre-determined transducer displacement conditions in the range of 0.1-3.0 mm. The subject's wrist was placed on the table with the forearm in the pronated position. The transducer was placed on the dorsal surface of the distal radius and ulna, perpendicular to the long axis of the forearm. The center of the ulnar head was at the DRUJ level. The distance between the dorsal surface of the distal radius and the ulnar head was measured at an initial and a pressed-down position. Changes in radioulnar displacement, force to the wrist and the displacement/force ratio were evaluated. The measurements were performed independently by two raters. The intra-class correlation coefficients (ICCs) for the radioulnar displacement were 0.76, 0.68, and 0.93, in the 1.0, 2.0, and 3.0 mm transducer displacement conditions, respectively. The ICCs for the force to the wrist were 0.18, 0.67, and 0.34, in different transducer displacement conditions, respectively. The ICCs for the displacement/force ratios were 0.68, 0.67, and 0.97, in different transducer displacement conditions, respectively. The highest ICC for the radioulnar displacement and the displacement/force ratio was observed in the 3.0 mm displacement condition. This assessment of displacement-force relationships may be useful to quantify DRUJ stability.

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Measurement of the Shift in the Distal Radioulnar Joint Using a Custom Platform

Cited by 2 publications

References 21 publications

Quantitative assessment of distal radioulnar joint stability with pressure-monitor ultrasonography

Quantitative assessment of distal radioulnar joint stability with pressure-monitor ultrasonography

Reliability of Quantitative Assessment of Distal Radioulnar Joint Stability With Force‐Monitor Ultrasonography

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