The Key Pinch Stress Radiograph to Evaluate Dorsal Subluxation in the Basilar Thumb Joint

被引:1
作者
Norton, Nolan M. [1 ]
Barnds, Brandon [2 ]
McIff, Terence E. [1 ,2 ]
Toby, E. Bruce [2 ]
Fischer, Kenneth J. [1 ,2 ,3 ]
机构
[1] Univ Kansas, Bioengn Program, Lawrence, KS 66045 USA
[2] Univ Kansas, Orthoped & Sports Med, Med Ctr, Kansas City, KS 66160 USA
[3] Univ Kansas, Mech Engn, Lawrence, KS 66045 USA
来源
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME | 2021年 / 143卷 / 11期
关键词
basilar thumb joint; osteoarthritis; stress view radiograph; subluxation; ARTICULAR-CARTILAGE DEGENERATION; TERM-FOLLOW-UP; TRAPEZIOMETACARPAL JOINT; INTEROBSERVER AGREEMENT; LIGAMENT RECONSTRUCTION; BASAL JOINT; OSTEOARTHRITIS; CLASSIFICATION; RELIABILITY; PATTERNS;
D O I
10.1115/1.4051526
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The basilar thumb joint is the joint second most commonly affected by osteoarthritis (OA) in the hand. Evaluation of dorsal subluxation of the thumb during a functional task such as key pinch could help assess OA risk. The objectives of this study were to determine the best imaging angle for measuring thumb dorsal subluxation during key pinch and to compare subluxation to corresponding OA grades on the Eaton-Glickel, Outerbridge, and International Cartilage Repair Society scales. Eleven cadaveric forearm specimens were rigged to simulate key pinch. A mobile c-arm captured anteroposterior (AP) view images of the hand and was rotated in 5 deg increments toward the ulnar aspect of the arm up to 60 deg. Dorsal subluxation was measured on each image and compared to determine which angle captured maximum subluxation. The resulting best imaging angle was used for comparisons between dorsal subluxation of the thumb and OA grades for the basilar thumb joint. The max subluxation was in the AP view for most specimens. There was a significant correlation between subluxation and the Eaton-Glickel grade (p = 0.003, R-2 = 0.779), but not with either Outerbridge grades (p = 0.8018) or International Cartilage Repair Society grades (p = 0.7001). Our results indicate that dorsal thumb subluxation during key pinch should be measured in the AP view of the forearm/hand. Dorsal thumb subluxation during key pinch had a significant correlation with the Eaton-Glickel radiographic measure of OA but not with more accurate visual classifications of OA.
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