Figgie M P, Inglis A E, Sobel M, Bohn W W, Fisher D A
Hospital for Special Surgery, New York, NY 10021.
J Hand Surg Am. 1990 Mar;15(2):210-6. doi: 10.1016/0363-5023(90)90097-b.
Fifty patients with rheumatoid arthritis had 59 Swanson implants of the metacarpal-phalangeal joint of the thumb. Eleven patients (15 implants) have since died and only 1 patient (1 implant) has been lost to follow-up leaving 43 implants available for study. The most common preoperative deformity was a boutonniere deformity with a flexible interphalangeal joint. All thumbs had less pain after operation. The average range of active motion is 25 degrees, with a flexion arc from 15 to 40 degrees. There is an average key pinch strength of 4 pounds (range, 0.5 to 10). Improvement in activities of daily living were noted in 40 hands. One thumb required reoperation for instability; the implant was removed and a metacarpal-phalangeal arthrodesis was done. Radiographic progression of disease was noted in only one thumb at the interphalangeal joint and in two other thumbs at the carpometacarpal joint. None of these have required further operations. The maintenance of motion appears to help in activities of daily living as stability and pinch strength are often adequate.
五十名类风湿性关节炎患者的拇指掌指关节植入了59个斯旺森假体。此后有11名患者（15个假体）死亡，仅有1名患者（1个假体）失访，剩余43个假体可供研究。术前最常见的畸形是纽扣花畸形伴指间关节灵活。所有拇指术后疼痛均减轻。主动活动的平均范围为25度，屈曲弧度为15至40度。平均捏力为4磅（范围为0.5至10磅）。40只手的日常生活活动能力有改善。1例拇指因不稳定需要再次手术；取出假体并进行了掌指关节融合术。仅1例拇指的指间关节以及另外2例拇指的腕掌关节出现了疾病的影像学进展。这些均未需要进一步手术。由于稳定性和捏力通常足够，维持活动似乎有助于日常生活活动。
