Effects of radioulnar instability on the radiocarpal joint: A biomechanical study

Steven F. Viegas; David J. Pogue; Rita M. Patterson; Pamela D. Peterson

doi:10.1016/0363-5023(90)90144-G

Effects of radioulnar instability on the radiocarpal joint: A biomechanical study

Steven F. Viegas, David J. Pogue, Rita M. Patterson, Pamela D. Peterson

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressure-sensitive film and a microcomputer-based videodigitizing system to assess the effect of increasing radioulnar instability on the load distribution within the proximal carpal joint. Three stages of radioulnar instability were studied: (1) an avulsion fracture at the base of the ulna styloid; (2) an avulsion fracture at the base of the ulna styloid plus disruption of the dorsal portion of the distal radioulnar joint capsule; and (3) an avulsion fracture at the base of the ulna styloid, disruption of the dorsal portion of the distal radioulnar joint capsule, and disruption of the radioulnar interosseous membrane. All stages of radioulnar instability demonstrated a decrease in the lunate contact area in positions with the forearm in supination. In stage 3 instability there was also less lunate contact area in positions with the forearm in neutral pronation/supination. In stage 3 instability the lunate high pressure area centroid was abnormally palmar in all positions and the scaphoid high pressure area centroid was abnormally palmar in positions with the forearm in pronation or supination.

Original language	English
Pages (from-to)	728-732
Number of pages	5
Journal	Journal of Hand Surgery
Volume	15
Issue number	5
DOIs	https://doi.org/10.1016/0363-5023(90)90144-G
State	Published - Sep 1990

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title = "Effects of radioulnar instability on the radiocarpal joint: A biomechanical study",

abstract = "Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressure-sensitive film and a microcomputer-based videodigitizing system to assess the effect of increasing radioulnar instability on the load distribution within the proximal carpal joint. Three stages of radioulnar instability were studied: (1) an avulsion fracture at the base of the ulna styloid; (2) an avulsion fracture at the base of the ulna styloid plus disruption of the dorsal portion of the distal radioulnar joint capsule; and (3) an avulsion fracture at the base of the ulna styloid, disruption of the dorsal portion of the distal radioulnar joint capsule, and disruption of the radioulnar interosseous membrane. All stages of radioulnar instability demonstrated a decrease in the lunate contact area in positions with the forearm in supination. In stage 3 instability there was also less lunate contact area in positions with the forearm in neutral pronation/supination. In stage 3 instability the lunate high pressure area centroid was abnormally palmar in all positions and the scaphoid high pressure area centroid was abnormally palmar in positions with the forearm in pronation or supination.",

author = "Viegas, {Steven F.} and Pogue, {David J.} and Patterson, {Rita M.} and Peterson, {Pamela D.}",

note = "Funding Information: From the Division of Orthopaedic Surgery, University of Texas Med-ical Branch, Galveston, Texas. Supported in part by a grant from the National Institute of Arthritis and Musculoskeletal and Skin Diseases No. 5 R29 AR 38640-02. Received for publication July 12, 1989; accepted in revised form Oct. 14, 1989. No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. Reprint requests: Steven F. Viegas MD, Division of Orthopaedic Surgery, McCullough Bldg., Rm 6.136 (G-92), University of Texas Medical Branch, Galveston, TX 77551. 311117718",

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AU - Peterson, Pamela D.

N1 - Funding Information: From the Division of Orthopaedic Surgery, University of Texas Med-ical Branch, Galveston, Texas. Supported in part by a grant from the National Institute of Arthritis and Musculoskeletal and Skin Diseases No. 5 R29 AR 38640-02. Received for publication July 12, 1989; accepted in revised form Oct. 14, 1989. No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. Reprint requests: Steven F. Viegas MD, Division of Orthopaedic Surgery, McCullough Bldg., Rm 6.136 (G-92), University of Texas Medical Branch, Galveston, TX 77551. 311117718

PY - 1990/9

Y1 - 1990/9

N2 - Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressure-sensitive film and a microcomputer-based videodigitizing system to assess the effect of increasing radioulnar instability on the load distribution within the proximal carpal joint. Three stages of radioulnar instability were studied: (1) an avulsion fracture at the base of the ulna styloid; (2) an avulsion fracture at the base of the ulna styloid plus disruption of the dorsal portion of the distal radioulnar joint capsule; and (3) an avulsion fracture at the base of the ulna styloid, disruption of the dorsal portion of the distal radioulnar joint capsule, and disruption of the radioulnar interosseous membrane. All stages of radioulnar instability demonstrated a decrease in the lunate contact area in positions with the forearm in supination. In stage 3 instability there was also less lunate contact area in positions with the forearm in neutral pronation/supination. In stage 3 instability the lunate high pressure area centroid was abnormally palmar in all positions and the scaphoid high pressure area centroid was abnormally palmar in positions with the forearm in pronation or supination.

AB - Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressure-sensitive film and a microcomputer-based videodigitizing system to assess the effect of increasing radioulnar instability on the load distribution within the proximal carpal joint. Three stages of radioulnar instability were studied: (1) an avulsion fracture at the base of the ulna styloid; (2) an avulsion fracture at the base of the ulna styloid plus disruption of the dorsal portion of the distal radioulnar joint capsule; and (3) an avulsion fracture at the base of the ulna styloid, disruption of the dorsal portion of the distal radioulnar joint capsule, and disruption of the radioulnar interosseous membrane. All stages of radioulnar instability demonstrated a decrease in the lunate contact area in positions with the forearm in supination. In stage 3 instability there was also less lunate contact area in positions with the forearm in neutral pronation/supination. In stage 3 instability the lunate high pressure area centroid was abnormally palmar in all positions and the scaphoid high pressure area centroid was abnormally palmar in positions with the forearm in pronation or supination.

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Effects of radioulnar instability on the radiocarpal joint: A biomechanical study

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