TY - JOUR
T1 - Simulated scaphoid proximal pole fracture
AU - Viegas, Steven F.
AU - Patterson, Rita M.
AU - Hillman, Gilbert R.
AU - Peterson, Pamela D.
AU - Crossley, Michael
AU - Foster, Robert
N1 - Funding Information:
From the Division of Orthopaedic Surgery, and the Departmentof Pharmacology, University of Texas Medical School, University of Texas Medical Branch, Galveston, Texas. Supported in part by a grant from the National Institute of Ar-thritis and Musculoskeletal and Skin Diseases No. 5 R29 AR 38640-42. Received for publication Dec. 19, 1989; accepted in revised form Feb. 23, 1990. 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 7755 1. 3/l/21046
PY - 1991/5
Y1 - 1991/5
N2 - Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressuresensitive film, a microcomputer-based videodigitizing system, and a Sun station image analysis system to assess the load bearing characteristics of the scaphoid in the proximal carpal joint. Specimens were studied in their normal condition, after a proximal pole osteotomy of the scaphoid, and after resection of the proximal pole of the scaphoid. The amount of contact area born through the scaphoid fossa was essentially the same whether the scaphoid was intact, or after a simulated scaphoid fracture of its proximal pole, or after resection of the proximal pole. The scaphoid contact area and pressure, although overall relatively constant, was redistributed after osteotomy, resulting in increased contact area under the distal fragment and no change or a slight decrease in the contact area under the proximal fragment of the scaphoid. After resection of the proximal fragment, all scaphoid contact area and pressure was born by the distal scaphoid fragment. The contact area and pressure characteristics of the lunate remained unchanged in all conditions compared with the normal condition. There were no significant changes in the locations of the centroids of the scaphoid segments and the lunate in any of the conditions tested.
AB - Five fresh cadaver upper extremities were studied with use of a static positioning frame, pressuresensitive film, a microcomputer-based videodigitizing system, and a Sun station image analysis system to assess the load bearing characteristics of the scaphoid in the proximal carpal joint. Specimens were studied in their normal condition, after a proximal pole osteotomy of the scaphoid, and after resection of the proximal pole of the scaphoid. The amount of contact area born through the scaphoid fossa was essentially the same whether the scaphoid was intact, or after a simulated scaphoid fracture of its proximal pole, or after resection of the proximal pole. The scaphoid contact area and pressure, although overall relatively constant, was redistributed after osteotomy, resulting in increased contact area under the distal fragment and no change or a slight decrease in the contact area under the proximal fragment of the scaphoid. After resection of the proximal fragment, all scaphoid contact area and pressure was born by the distal scaphoid fragment. The contact area and pressure characteristics of the lunate remained unchanged in all conditions compared with the normal condition. There were no significant changes in the locations of the centroids of the scaphoid segments and the lunate in any of the conditions tested.
UR - http://www.scopus.com/inward/record.url?scp=0025911556&partnerID=8YFLogxK
U2 - 10.1016/0363-5023(91)90021-3
DO - 10.1016/0363-5023(91)90021-3
M3 - Article
C2 - 1861034
AN - SCOPUS:0025911556
SN - 0363-5023
VL - 16
SP - 495
EP - 500
JO - Journal of Hand Surgery
JF - Journal of Hand Surgery
IS - 3
ER -