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Screw Versus Hybrid Constructs for Flexible Thoracic Curves in Adolescent Idiopathic Scoliosis: A Prospective, Randomized Study

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Abstract

Study Design

Prospective, computer-randomized design.

Objective

Compare screw and hybrid constructs in flexible, thoracic curves for adolescent idiopathic scoliosis (AIS) in a prospective randomized fashion.

Summary of Background Data

The consensus in scientific literature is that all-screw constructs correct AIS better than hooks in the lumbar and in large, stiff thoracic curves. However, debate continues whether all-screw constructs outperform hybrid constructs in small, flexible thoracic AIS. To our knowledge, this is the first prospective, randomized scoliosis study that examines measures of correction and patient satisfaction with the Scoliosis Research Society—30 (SRS-30) questionnaire.

Methods

A total of 45 enrolled AIS patients with flexible, thoracic curves were given an identification number with an associated computer-generated randomization to the hybrid (n = 22) or screw group (n = 23). The treating surgeon received the randomization 2—3 days before surgery. Data including major Cobb (MC), truncal rotation (TR), rib index (RI), secondary curve (SC), and SRS-30 questionnaire were collected preoperatively and postoperatively at 4 weeks and 3, 6, 12, and 24 months.

Results

Thirty-seven patients in the hybrid (n = 18) and screw (n = 19) groups completed the study with a mean follow-up of 26 months (range, 24—49 months). Hybrid versus screw group means for preoperative, postoperative, and final follow-up were: MC 58° ± 8° versus 55° ± 6°, 18° ± 8° versus 15° ± 7°, and 23°± 8° versus 14° ± 6°; TR 14° ± 6° versus 16° ± 4°, 10° ± 5° versus 7° ± 3°, and 11° ± 5° versus 7° ± 4°; RI 3.0° ± 1.2° versus 3.4° ± 1.4°, 2.5° ± 0.7° versus 1.8° ± 0.6°, and 2.5° ± 0.8° versus 2.0° ± 0.5°; SC 35° ± 13° versus 31° ± 8°, 13° ± 11° versus 7° ± 9°, and 13° ± 12° versus 7° ± 7°; and SRS-30 3.9 ± 0.2 versus 3.9 ± 0.2, 4.1 ± 0.4 versus 4.0 ± 0.3, and 4.1 ± 0.3 versus 4.0 ± 0.2.

Conclusions

Intergroup preoperative and early postoperative values were comparable (p >.05). At final follow-up, owing to loss of correction in the hybrid group, differences in MC (9°; p =.000), RI (0.54; p =.016), and TR (4°; p =.039) correction were statistically significant as SC trended toward significance (6°; p =.052). All-screw constructs outperformed hybrid constructs, especially over time. No differences in SRS-30 scores occurred between groups.

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Author information

Correspondence to Lawrence L. Haber MD.

Additional information

Author disclosures: LLH (grants from Depuy Spine (grant no: 2005CO24), during the conduct of the study), JDH (grants from Depuy Spine (grant no: 2005CO24), during the conduct of the study), EDW (grants from Depuy Spine (grant no: 2005CO24), during the conduct of the study), RMR (grants from Depuy Spine (grant no: 2005CO24), during the conduct of the study), PBW (grants from Depuy Spine, during the conduct of the study).

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Haber, L.L., Hughes, J.D., Womack, E.D. et al. Screw Versus Hybrid Constructs for Flexible Thoracic Curves in Adolescent Idiopathic Scoliosis: A Prospective, Randomized Study. Spine Deform 2, 367–373 (2014). https://doi.org/10.1016/j.jspd.2014.05.005

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Keywords

  • AIS
  • Screw
  • Hybrid
  • Flexible
  • Thoracic