貝克氏囊腫破裂於風濕性疾病患者：分析198位病人發現235個貝克氏囊腫

Ruptured Baker’s cyst in patients with rheumatic diseases: analysis of 235 Baker's cysts in 198 patients

目的：我們回顧性分析non-ruptured 與 ruptured Baker's cyst 病人臨床特性，潛在的疾病與囊腫大小。方法：從2006年6月至2009年6月以回顧性方式分析在本院風濕免疫過敏科接受肌肉骨超音波診斷為Baker's cyst 病患。結果：我們發現其中235個Baker's cyst，ruptured Baker's cyst有22人（右側 11位，左側 11位）。non-ruptured Baker's cyst 的相關疾病有：退化性關節炎125位，痛風關節炎41位，類風濕性關節炎21位，假性痛風13位，血清陰性關節炎13位；Ruptured Baker's cyst 的相關疾病有：類風濕性關節炎11位，退化性關節炎4位，痛風關節炎3位，血清陰性關節炎1位，全身性紅斑性狼瘡4位，假性痛風1位，多發性肌炎1位。結論：我們發現潛在膝關節病變是Baker's cyst的主要原因，且越嚴重的發炎性關節炎越有可能造成ruptured Baker's cyst；肌肉骨骼超音波對於早期發現Baker's cyst是一個有用的工具，以避免Baker's cyst造成的併發症。

Purpose: We retrospectively analyzed patients' characteristics, underlying diseases, and size of lesion between ruptured and non-ruptured Baker's cysts (BC). Method: We retrospectively reviewed the hospital records of 198 patients with 161 unilateral and 37 bilateral BCs that were diagnosed by musculoskeletal ultrasound (MSU) at a rheumatology department from June 2006 to June 2009. Result: We found 235 BCs of which 22 were ruptured (11 right and 11 left knees). Non-ruptured BC and associated diseases occurance were as follows: Osteoarthritis (OA) (125), gout (41), rheumatoid arthritis (RA) (21), pseudogout (13), and spondyloarthropathy (SpA) (13). Ruptured BCs were associated with the following diseases: RA (11), OA (4), gout (3), SpA (1), systemic lupus erythematosus (1), pseudogout (1), and polymyositis (1). Conclusion: OA was the leading cause of non-ruptured Baker's cysts while RA with active arthritis were the major causes of ruptured BCs. MSU was found to be a useful tool for identifying these diseases in rheumatologic clinics.