Department of Plastic and Reconstructive Surgery, Kyoto University, Kyoto, Japan.
J Hand Surg Eur Vol. 2021 May;46(4):352-359. doi: 10.1177/1753193421990212. Epub 2021 Feb 7.
Wassel VI radial polydactyly is associated with metacarpal adduction and radial deviation of the metacarpophalangeal joint of the ulnar duplicate. The soft tissue abnormalities responsible for these deformities were characterized using preoperative multi-planar three-dimensional ultrasound and intraoperative observation in four patients. In all patients, the abductor pollicis brevis and superficial head of the flexor pollicis brevis inserted into the radial first metacarpal, whereas the adductor pollicis and deep head of the flexor pollicis brevis inserted into the ulnar thumb. Aberrant location of the flexor pollicis longus and absence of the A1 pulley system was associated with severe radial deviation. An additional superficial thenar muscle along the ulnar metacarpal was associated with minimal metacarpal adduction. Uneven forces on the ulnar duplicate could be associated with these characteristic deformities and joint instability. Knowledge of these abnormalities allows better planning of surgery and further insight into this rare radial polydactyly configuration. II.
瓦塞尔 VI 型桡侧多指与掌骨内收和尺侧重复的掌指关节桡侧偏斜有关。在四名患者中，使用术前多平面三维超声和术中观察来描述这些畸形的软组织异常。在所有患者中，拇短展肌和拇短屈肌浅头插入桡侧第一掌骨，而拇内收肌和拇短屈肌深头插入尺侧拇指。拇长屈肌的异常位置和 A1 滑车系统的缺失与严重的桡侧偏斜有关。沿尺侧掌骨的额外的浅层鱼际肌与最小的掌骨内收有关。尺侧重复上的不均匀力可能与这些特征性畸形和关节不稳定有关。对这些异常的了解可以更好地规划手术，并进一步深入了解这种罕见的桡侧多指畸形结构。
