Rib deformity in scoliosis

Area of Science:

• Orthopedics
• Radiology
• Spinal Surgery

Background:

• Rib deformity is a notable feature in scoliosis, potentially aiding diagnosis and requiring surgical correction (costoplasty) in severe cases.
• Debate exists regarding the diagnostic utility of rib deformity, with some questioning its direct correlation to scoliosis magnitude or vertebral rotation.
• Understanding the precise relationship between rib cage deformity and spinal curvature is essential for surgical planning.

Purpose of the Study:

• To investigate the relationship between rib deformity and spinal parameters in scoliosis patients.
• To determine the accuracy of standard radiographs versus CT scans in identifying the most rotated vertebra and rib prominence.
• To evaluate the necessity of advanced imaging for preoperative planning of costoplasty.

Main Methods:

• Recruited 11 patients undergoing scoliosis surgery and thoracoplasty.
• Acquired anteroposterior (AP) T1-S1 standing radiographs, computerized tomography (CT) scans, and 3D reconstructions.
• Correlated vertebral levels from radiographs and CT scans with the most prominent rib cage deformity.

Main Results:

• The most rotated vertebra was inconsistently identified between radiographs and CT scans (concordant in only 5/11 patients).
• The most prominent rib deformity was frequently located at vertebral levels below the most rotated vertebra (1-3 levels lower in most patients).
• No significant association was found between Cobb angle, vertebral rotation, and the degree of rib deformity.

Conclusions:

• Standard radiographs may inaccurately represent the vertebral level of maximal rotation and rib deformity.
• Computerized tomography (CT) scans are essential for precise preoperative assessment of rib prominence in patients undergoing costoplasty.
• 3D reconstructions are necessary to accurately match rib cage deformities to corresponding vertebral levels for surgical planning.