Wilkinson S V, Jones R O, Sisk L E, Sunshein K F, Van Manen J W
Madigan Army Medical Center, Tacoma, Washington.
J Foot Surg. 1992 Sep-Oct;31(5):469-77.
The authors used magnetic resonance imaging (MRI) to evaluate the formation rate of avascular necrosis following performance of 20 modified Austin bunionectomies. Five modified McBride bunionectomies without first metatarsal osteotomy were also performed as an MRI control. Results showed an avascular necrosis formation rate of 50%. The majority of the avascular necrosis areas were found dorsally within the cancellous bone substance of the first metatarsal head. These lesions, in all cases, did not cause any patient disability or result in any decline in the degree of patient satisfaction. The MRI positive avascular necrosis evaluations do suggest potential problem areas with the surgical technique that may be eliminated through further modification of the classic Austin bunionectomy procedure.
作者使用磁共振成像（MRI）评估了20例改良奥斯汀拇囊炎切除术术后无血管性坏死的形成率。还进行了5例未行第一跖骨截骨术的改良麦克布莱德拇囊炎切除术作为MRI对照。结果显示无血管性坏死形成率为50%。大多数无血管性坏死区域位于第一跖骨头松质骨的背侧。在所有病例中，这些病变均未导致任何患者残疾，也未导致患者满意度下降。MRI对无血管性坏死的阳性评估确实提示了手术技术中可能存在的问题区域，可通过进一步改良经典奥斯汀拇囊炎切除术来消除这些问题。
