- Anatomical Resection:
- Resection of the inferior facet and joint capsule at a specific spinal level.
- This procedure offers the potential for fusion through the removal of cartilage from the superior facet.
- Prerequisites: A crucial requirement for performing a Grade 1 osteotomy is pre-existing anterior column mobility (i.e., non-fusion of the anterior column).
- Without this mobility, there's a risk of vascular and neurological sequelae.
- Correction Potential:
- 1mm bone resection: 1 degree correction
- This grade has limited capacity for deformity correction. On average, 5° to 10° of correction can be achieved at each level.
- Published Techniques Associated with Grade 1 Osteotomies:
- The opening-wedge osteotomy, also known as the Smith-Petersen osteotomy, is classified as a Grade 1 procedure. Historically, this has been described as involving multiple levels through previously fused articular processes.
- Other terms commonly used to describe this type of osteotomy include the Chevron osteotomy and the extension osteotomy, which were specifically described through unfused facets.
- Risks
- Stretch-induced injury to anterior vessels (e.g., superior mesenteric artery syndrome)
- nonunion.
- In AIS deformity correction
- Routinely utilised in posterior spinal instrumentation and fusion (PSIF) for AIS.
- Enhance visualisation of anatomical landmarks for pedicle screw placement.
- Provide autograft material.
- Increase spinal mobility.
- Facilitate interfacetal fusion.
Made with Bullet