Wednesday, October 20, 2021


Blog Topic:  

“How much correction of the scoliosis did you get during surgery ?”


6 months ago in the April 5th, 2021 blog post I addressed the question I sometimes get asked after surgery by parents, families and caregivers:

“How much correction of the scoliosis did you get during surgery?”

This blog post I will try to explain why we don’t always want 100%, or even 90% or 80% or 70% of the spine deformity.

The first step is to use optics of long-term outcomes, specifically minimal discomfort and highest level of function for decades into the future.

To start the discussion it is important when we talk about surgery for scoliosis, is to understand the ways we evaluate spine deformity.  In the below picture the 3 planes of analysis are shown: coronal, sagittal and transverse/axial plane.

During surgery to make the spine “normal” we need to:

1.      Make the spine totally straight (when we look from the front or back)

2.      From the side the spine should have the normal “S-curve”

3.      Correct all the abnormal rotation

If we do all 3 things this means 100% correction of the scoliosis, in all 3 planes (see below):

Interestingly, research studies over the last 10+ years, using patient-reported outcome measures, have identified what matters the most for highly-functioning, minimally-painful, long-term outcome:

Global coronal and sagittal alignment (Aims #1 and #2)

Basically we want to put the head balanced over the pelvis. Notice I didn’t say axial or transverse plane (Aim #3)

So, it is safe to say 100% correction is NOT necessary for optimal outcome long-term.

We will talk more about this topic in the next post.

Friday, October 8, 2021


Blog Post             Another new study on Vertebral Body Tethering (VBT)                 10-8-2021


This study comes from the San Diego group, who have a long, cautious experience with VBT.



23 patients whose mean age at surgery was 12.2 +/- 1.6 years


Mean curve 53 +/- 8 degrees

All were Risser 0-1, Sanders 2-3 at surgery

Minimum follow-up after surgery of 2 years, with mean follow-up of 3.4 years +/-1.1 years



1.      Scoliosis correction correlated with overall height change, mainly within 2-3 years postop in Risser 0 patients.

2.      Sanders 2 group corrected at twice the rate as the Sanders 3 group (2.8 degrees/year vs. 1.2 degrees/year)

a.      In Sanders 2 patients deformity correction decreased after 3 years postoperatively

b.      In Sanders 3 patients deformity correction decreased after 2 years postoperatively

This will help with decision making when determining optimal therapeutic interventions, and the timing of VBT surgeries.

Tuesday, October 5, 2021

 A nice piece on Shriners Hospital in St. Louis.