Stiffness of the First Annular Pulley in Normal and Trigger Fingers

Sonographic evaluation of effects of the volar plate on trigger finger

“…In addition, no significant difference between affected fingers before and after corticosteroid injection was seen in nine fingers with triggering, although symptoms improved after injection in eight fingers in this study. This result resembled that reported by Miyamoto et al [5]. Considering these results, thickening of the flexor tendon may not contribute to continuous triggering as much as thickening of the A1 pulley and volar plate, although it remains important in the diagnosis of trigger finger.…”

“…Fifth, the number of cases in this study was small. In particular, only nine cases were included to compare the effects of steroid on triggering symptoms between pre-corticosteroid and post-corticosteroid injection, although this sample size was sufficient to show significant differences in thicknesses of the A1 pulley and volar plate between affected fingers precorticosteroid and post-corticosteroid injection and resembled that in the study by Miyamoto et al [5], which compared sonographic findings in ten cases before and after corticosteroid injection. Sixth, we didn't compare between Groups 1 and 2 directly and this can make the validity of our theories weak.…”

“…Recently, high-resolution sonography has allowed noninvasive visualization of the pulley and tendons and some studies have examined causes of trigger finger sonographically [2][3][4][5][6][7][8]. Those investigations have shown sonographic findings, such as thickening of the A1 pulley or flexor tendon, peritendinous effusion, and irregular echotexture of the flexor tendon, in trigger fingers.…”

“…Miyamoto et al [5] treated ten trigger fingers by injecting 10 mg of triamcinolone acetonide, and showed that thickness of the A1 pulley on sonography was significantly decreased after injection, although no significant difference in cross-sectional area of the flexor tendon was seen between before and after injection. Such findings suggest thickening of the A1 pulley as a primary cause of Abstract Background We evaluated trigger fingers ultrasonographically and clarified differences between fingers with and without continuous locking or snapping symptoms according to the thicknesses of the A1 pulley, flexor tendon and volar plate.…”

Trigger Finger Release With Stepwise Preservation of the A1 Pulley: A Functional Pulley-Preserving Technique

“…1 It is one of the most common and debilitating conditions of the hand, with a prevalence of nearly 3% in the population. 2 Histologically this can be seen as a structural change from bilaminar to trilaminar, and the irregular change from normal deep layers of dense connective tissue to small collagen fibers with abundant extracellular matrix with fibrocartilage metaplasia.…”