Scoliosis after pectus excavatum correction: does it improve or worsen?
OBJECTIVE
Scoliosis is associated with pectus excavatum. However, the change in the degree of scoliosis after pectus excavatum correction has not been clarified. This study examined how the correction of pectus excavatum influences the status of pre-existing scoliosis.


METHODS
A total of 779 pectus excavatum patients operated between 2007 and 2011 using the pectus bar were retrospectively analysed. Preoperative severity and postoperative change of scoliosis in accordance with the severity of pectus excavatum were evaluated. Cobb angle, Haller index and sternal tilt degree were measured from pre- and postoperative whole-spine anteroposterior radiographs and chest computed tomography.


RESULTS
Sixty-three (8%) patients had scoliosis (Cobb angle >10°). No significant correlation was noted between postoperative changes in Cobb angle, Haller index or sternal tilt angle. Preoperative severity of scoliosis showed a positive correlation with postoperative changes in Cobb angle ( r  = 0.527, P  < 0.001). In analyses between groups with mild and moderate scoliosis (Cobb angle <15° and >15°, respectively), the mean postoperative Cobb angle was decreased in mild scoliosis (-2.88°) but was increased in moderate scoliosis (3.86°; P  < 0.001). Regarding the 'improvement' and 'aggravation' of scoliosis after pectus correction, preoperative severity of scoliosis was the only significant factor in univariable and multivariable analysis.


CONCLUSIONS
Pectus excavatum repair using a pectus bar may improve scoliosis, but when the preoperative Cobb angle exceeds 15°, scoliosis may be aggravated. Therefore, pectus excavatum with concomitant moderate scoliosis requires extra caution during repair. This preliminary result suggests further investigation into the effect of chest cage remodelling on spine dynamics.
Department of Thoracic and Cardiovascular Surgery, Korea University Anam Hospital, Korea University Medical College, Seoul, Korea.
Jae Ho
JH
Chung
Department of Thoracic and Cardiovascular Surgery, Seoul St. Mary's Hospital, The Catholic University College of Medicine, Seoul, Korea.
Hyung Joo
HJ
Park
Department of Thoracic and Cardiovascular Surgery, Korea University Anam Hospital, Korea University Medical College, Seoul, Korea.
Kwang Taik
KT
Kim
D005260:Female; D005660:Funnel Chest / Q000601:surgery*; D006801:Humans; D015994:Incidence; D008297:Male; D011183:Postoperative Complications / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D011379:Prognosis; D013902:Radiography, Thoracic; D056910:Republic of Korea / Q000453:epidemiology; D012189:Retrospective Studies; D012600:Scoliosis / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D013904:Thoracic Vertebrae; D013905:Thoracoplasty / Q000009:adverse effects* / Q000379:methods; D014057:Tomography, X-Ray Computed; D055815:Young Adult
Pectus excavatum; Pectus excavatum repair; Scoliosis