Kim Min-Cheol, Joo Sang-Don, Jung Sung-Taek
Department of Orthopedic Surgery, Chonnam National University Hospital, Gwangju, Republic of Korea.
J Orthop Surg (Hong Kong). 2018 May-Aug;26(2):2309499018778366. doi: 10.1177/2309499018778366.
To evaluate the role of fractures on pathologic bone in healing of proximal humerus unicameral bone cysts (UBCs) and investigate the clinical factors that affect healing of UBCs after fractures on pathologic bone.
This prospective study was carried out between 2002 and 2014. We evaluated 56 patients with a UBC accompanying fractures on pathologic bone in the proximal humerus. Clinical data were collected from the patients' medical records. Age, gender, degree of fracture displacement, location of cyst, and cyst size were investigated, and we assessed how these factors affected cyst healing.
The overall healing rate of UBCs 1 year after fracture was 66% (37 of 56 cases). The healing rate was significantly lower in pubescent patients (10-14 years old; 45%) than in those who were 9 years old (76%) or 15 years old (80%). The rate of healing of fractures in the metaphysis (53%) was lower than that of breaks in the diaphysis (85%). The mean cyst ratio was 1.31 in the 37 patients who experienced cyst healing within 1 year and 1.79 in the 19 patients who needed surgical treatment within 1 year.
In latent lesions and in patients who are older (after puberty), UBCs of the humerus after fracture have better clinical results than do active lesions and those in younger patients (before puberty). Fractures on pathologic bone in proximal humerus UBCs often dramatically decrease cyst size, and patients with such fractures have excellent clinical results in terms of healing rate.
评估病理性骨骨折在肱骨近端单房骨囊肿（UBCs）愈合中的作用，并研究影响病理性骨骨折后UBCs愈合的临床因素。
这项前瞻性研究于2002年至2014年进行。我们评估了56例肱骨近端伴有病理性骨骨折的UBCs患者。从患者病历中收集临床数据。调查年龄、性别、骨折移位程度、囊肿位置和囊肿大小，并评估这些因素如何影响囊肿愈合。
骨折后1年UBCs的总体愈合率为66%（56例中的37例）。青春期患者（10 - 14岁；45%）的愈合率明显低于9岁（76%）或15岁（80%）的患者。干骺端骨折的愈合率（53%）低于骨干骨折的愈合率（85%）。1年内囊肿愈合的37例患者的平均囊肿比率为1.31，1年内需要手术治疗的19例患者的平均囊肿比率为1.79。
在潜在病变和年龄较大（青春期后）的患者中，骨折后肱骨UBCs的临床结果优于活跃病变和年龄较小（青春期前）的患者。肱骨近端UBCs病理性骨骨折常使囊肿大小显著减小，此类骨折患者在愈合率方面具有出色的临床结果。
