Quantitative Assessment of Distal Radioulnar Joint Stability With Pressure-Monitor Ultrasonography

Study Overview
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Brief Summary
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To quantitatively assess distal radio ulnar joint (DRUJ) stability, a pressure-monitor ultrasound system was developed. The objective of this study was to evaluate the force-displacement relationship of DRUJ in patients and normal subjects. Each subject will be imaged sitting with elbow flexed and forearm pronated. The dorsal surface of distal radius and the center of ulnar head will be displayed at DRUJ level. The pressure toward palmar direction will be applied to 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 will be measured. At the same time, the pressure to the transducer will be measured.

Official Title
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Quantitative Assessment of Distal Radioulnar Joint Stability With Pressure-Monitor Ultrasonography

Conditions
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Distal Radioulnar Joint Sprain, Triangular Fibrocartilage Complex Injury

Intervention / Treatment
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* Device: pressure monitor ultrasound system


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy volunteers DRUJ instability patients Exclusion Criteria: the participants who had a history of previous wrist trauma and wrist pain will be excluded

Ages Eligible for Study
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Minimum Age: 20 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: patients and healthy controls
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Healthy volunteer<br> | Device: pressure monitor ultrasound system<br>* Patients and healthy volunteers will be tested sitting with the elbow flexed and the forearm pronated. The forearm of the examinee will be secured to the table. The hand will be positioned on an adjustable block such that the forearm will be in a horizontal position. At the distal radioulnar joint level, the transducer will be maintained perpendicular to the longitudinal axis of the ulna. The dorsal surface of the distal radius and the center of the ulnar head will be displayed on a monitor.To determine the same measurement level in each volunteer, the highest aspect of the ulnar head will be taken. The DRUJ motion during cyclic loading toward the palmar direction at the distal ulna will be recorded. The compression-release cycles will be applied with the pressure-monitor ultrasound system. The cycle will be set to 1.5Hz. The pressure in the palmar direction will be applied with different levels of transducer displacements, i.e. 1 mm, 2 mm, and 3 mm.<br>|
| Active Comparator: DRUJ instability patients<br> | Device: pressure monitor ultrasound system<br>* Patients and healthy volunteers will be tested sitting with the elbow flexed and the forearm pronated. The forearm of the examinee will be secured to the table. The hand will be positioned on an adjustable block such that the forearm will be in a horizontal position. At the distal radioulnar joint level, the transducer will be maintained perpendicular to the longitudinal axis of the ulna. The dorsal surface of the distal radius and the center of the ulnar head will be displayed on a monitor.To determine the same measurement level in each volunteer, the highest aspect of the ulnar head will be taken. The DRUJ motion during cyclic loading toward the palmar direction at the distal ulna will be recorded. The compression-release cycles will be applied with the pressure-monitor ultrasound system. The cycle will be set to 1.5Hz. The pressure in the palmar direction will be applied with different levels of transducer displacements, i.e. 1 mm, 2 mm, and 3 mm.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Instability of distal radioulnar joint (pressure) | According to the measurements of the pressure to distal radioulnar joint, determine if the exam can distinguish patients from healthy subjects. | 1 year | 
| Instability of distal radioulnar joint (dsiplacement) | According to the measurements of the displacement of distal radioulnar joint, determine if the exam can distinguish patients from healthy subjects. | 1 year |