Beam-like rods result in significantly better curve correction than curved rods in AIS treatment


K2M logoData from a study published in Spine have shown that K2M’s Mesa Rail deformity spinal system could result in significantly better major curve correction than standard circular rod constructs.

Mesa Rail features a beam-like design that provides enhanced rigidity to aid in the restoration of sagittal balance while maintaining a low profile.

The findings, authored by Martin Gehrchen, Søren Ohrt-Nissen, Dennis W Hallager, and Benny Dahl of Rigshospitalet at the University of Copenhagen in Denmark, were gathered from 129 surgical cases for patients treated for adolescent idiopathic scoliosis between May 2011 and May 2015. Subjects were placed into two groups based on the rod they were treated with (beam-like or curved). The study utilised craniocervical instability to eliminate bias caused by differences in preoperative flexibility and demonstrated that their results were not significantly influenced by a surgical learning curve. Long-term follow-up is needed to assess if correction is maintained over time.

The results showed that major curve correction was significantly better in the beam-like rod group (66%) compared to the circular rod group (57%), evidenced by whole spine standing anteroposterior and lateral radiographs that were taken preoperatively and within seven days following the surgery. Further, the Mesa Rail beam-like rod cohort showed shorter operative times, less blood loss, and shorter hospital stays when compared to the standard circular rod cohort. Both groups showed a slight decrease in thoracic kyphosis.

Eric Major, president and chief executive officer of K2M, says, “These findings reinforce that low-profile constructs…are not only safe, but allow surgeons to achieve a better curve correction, while also reducing, in some patients, the frequency of implant-related discomfort or pain.”