Pulmonary Function Improvement in Patients With Ankylosing Spondylitis Kyphosis After Pedicle Subtraction Osteotomy

In Brief Study Design. A prospective clinical study. Objective. To observe postoperative change in pulmonary function in patients with ankylosing spondylitis (AS) kyphosis after pedicle subtraction osteotomy (PSO). Summary of Background Data. The preoperative pulmonary dysfunction in patients with AS has been reported in several literatures, whereas few research about postoperative changes in pulmonary function with AS kyphosis was published. Methods. A total of 32 (27 males and 5 females) patients with AS were eligibly involved. Twenty-nine (25 males and 4 females) patients completed the follow-up and 3 (2 males and 1 females) patients were lost. Pulmonary function tests, breath-holding time (BHT), and full-length spine radiographs in natural standing position were followed postoperatively. Results. The global kyphosis significantly decreased from…