title: Arthroscopic treatment of bony loose bodies in the subacromial space.
abstract: BACKGROUND
  Multiple bony loose bodies in the subacromial space caused form cartilage or bone cells and continue to grow.
  
  
  METHODS
  A 58-year-old man with two-year history of swelling and pain of the right shoulder. He had no history of tuberculosis and rheumatoid arthritis. Magnetic resonance (MR) images showed some bony loose bodies in the subacromial space. The removal of loose bodies and bursa debridement were performed arthroscopically. Histological diagnosis of them was synovitis with fibrous bodies.
  
  
  CONCLUSIONS
  Extra-articular loose bodies is extremely rare, especially in the subacromial space, which maybe originated in the proliferative synovial bursa. Most authors recommend open removal to relive the pain, but there were choice to apply arthroscopy to remove them.
  
  
  CONCLUSIONS
  The mechanism of formation of bony loose bodies is not clear, may be associated with synovial cartilage metaplasia. Arthroscopic removal of loose bodies and bursa debridement is a good option for treatment of the loose body in the subacromial space, which can receive good function.
authors.affiliation: The Department of Sports Medicine and Rehabilitation, Peking University Shenzhen Hospital, Lianhua Road 1120, FuTian District, Shen Zhen 518036, Guang Dong, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: The Department of Sports Medicine and Rehabilitation, Peking University Shenzhen Hospital, Lianhua Road 1120, FuTian District, Shen Zhen 518036, Guang Dong, PR China.
authors.forename: De-Ming
authors.initials: DM
authors.lastname: Xiao
authors.affiliation: The Department of Sports Medicine and Rehabilitation, Peking University Shenzhen Hospital, Lianhua Road 1120, FuTian District, Shen Zhen 518036, Guang Dong, PR China.
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Jiang
authors.affiliation: The Department of Sports Medicine and Rehabilitation, Peking University Shenzhen Hospital, Lianhua Road 1120, FuTian District, Shen Zhen 518036, Guang Dong, PR China. Electronic address: szydyx2014@163.com.
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Zhang
authors.affiliation: The Department of Sports Medicine and Rehabilitation, Peking University Shenzhen Hospital, Lianhua Road 1120, FuTian District, Shen Zhen 518036, Guang Dong, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Lei
keywords: Arthroscopy; Bony loose bodies; Bursitis; Shoulder; Subacromial space; Synovitis