A novel Hinge-Link correction system for vertebral column resection: a pilot study in a porcine model

Area of Science:

• Orthopedic surgery
• Spinal deformity correction
• Biomedical engineering

Background:

• Severe scoliosis presents significant surgical challenges.
• Vertebral column resection (VCR) is a complex procedure for correcting severe spinal deformities.
• Existing methods may have limitations in achieving optimal correction and ensuring neurological safety.

Purpose of the Study:

• To introduce and evaluate a novel Hinge-Link (HL) correction system for VCR in severe scoliosis.
• To assess the feasibility and neurological safety of the HL system in a porcine scoliosis model.

Main Methods:

• A novel Hinge-Link (HL) system was described and demonstrated on a 3D spine model.
• Surgical scoliosis was induced in five pigs.
• VCR was performed using the HL system to correct the deformity, assessing its performance and safety.

Main Results:

• The induced scoliosis averaged 32° before correction.
• The HL system facilitated VCR, with all animals remaining neurologically intact post-procedure.
• Mean scoliosis correction was 94%, reducing the curve to 1.8°.
• Post-sacrifice examination revealed no vertebral subluxation or dural impingement.

Conclusions:

• The Hinge-Link (HL) system is feasible and neurologically safe for VCR in a pig scoliosis model.
• The device provides significant spinal deformity correction with appropriate length changes and no neurological deficits.
• The HL system's rigid control may improve correction outcomes and reduce surgical complications.