Thomas M. Gavin, C.O. BioConcepts, inc. Burr Ridge, Illinois, USA
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Transcript of Thomas M. Gavin, C.O. BioConcepts, inc. Burr Ridge, Illinois, USA
Indications for Treatment and Outcomes Evaluation for the
Orthotic Management of Idiopathic ScoliosisThomas M. Gavin, C.O.
BioConcepts, inc. Burr Ridge, Illinois, USA
Musculoskeletal Biomechanics Laboratory.Veterans Administration Hospital, Hines, Illinois,
USAAOPA Seattle 2009
Timothy J. Newton, C.O.January 4th 1949-September 13th 2009
SRS Definition of Terms
ACCEPTEDNOMENCLATURE FOR SPINAL RELATED CONDITIONS AND PROCEDURES RELATED TO SPINAL DEFORMITIES.
IDIOPATHIC SCOLIOSIS
ORTHOTIC TREATMENT FOR IDIOPATHIC SCOLIOSIS
Why use an orthosis? When do we use an orthosis? How does an orthosis work? How long should it be worn? Which orthosis should I use? Is part-time treatment effective? What is the chance of still needing
surgery after orthotic management?
CURVE PATTERNS AND
MEASUREMENTS
Left Lumbar Curve
King Type I
Right Thoracic PrimaryLeft Lumbar CompensatoryCurves.
King Type II
King Right Thoracic Curve
King Type III
Thoracolumbar CurveKing Type IV
Cob
b A
n gl e
51°
A B C D E
A. 0 Rotation. Neutral. No Rotation.
B. +1 Rotation. Pedicle Towards Midline. Concave Direction.
C. +2 Rotation. Pedicle 2/3 to Midline.
D. +3 Rotation. Pedicle at Midline.
E. +4 Rotation. Pedicle Beyond Midline.
Vertebral Rotation.
Maturation and Development
Vertebral Ring Apophyses. Line of Risser. Development of Secondary
Sex Characteristics. Menarche. Growth Velocity.
VERTEBRALRING APOPHYSES
A B C
A. Ring Apophysis Begins To Form.
B. Ossification Complete, Not United With Body.
C. Ossified and United With Body. Mature.
RISSER SIGN
Risser 1 = 25% Capping. Risser 2 = 50% Capping.Risser 3 = 75% Capping.Risser 4 = 100% Capping.Risser 5 = 100% Capping + Fusion.
Line Of Risser
TANNER SIGNS
5 Stages of Breast and Pubic Hair Development
5 Stages of Genitalia and Pubic Hair Development
MATURITY AT ORTHOSIS INITIATION AFFECTS
OUTCOMES
From Bunch and Patwardhan: Scoliosis; Making Clinical Decisions. CV Mosby Company, 1989
Bracing initiated at 6- 18 months Premenarchal
From Bunch and Patwardhan: Scoliosis; Making Clinical Decisions. CV Mosby Company, 1989
Bracing Initiated 6 Months Premenarchal to 6 Months Post Menarche
From Bunch and Patwardhan: Scoliosis; Making Clinical Decisions. CV Mosby Company, 1989
Bracing Initiated 6-18 Months Post-Menarche
Determining Clinical Curve Stiffness.
Side Bending Correction of Each Curve.
Expressed As % Correction From Normal.
% Correction Thoracic: % Correction Lumbar = “Flexibility Index” As Reported by King Et Al.
A. B. C.
A. Normal Coronal Alignment .
B. Right Side Bending. Primary Thoracic Curve Resists Corrective Forces.
C. Left Side Bending. Compensatory Lumbar Curve Corrects To Nearly 0°.
Biological Changes in Bone Morphology
Epiphyseal Growth Is Slowed When Epiphyses Are
Compressed.(Hueter-volkman Principle)
HUETER-VOLKMAN WEDGING.
Concave Side Epiphysis Develops at a Slower Rate Than Convex Side Due to Compression.
Clinical Evaluation and Mechanism of Action
Orthoses must be designed and fitted to: Reduce Curve Maximally. Reduce Any Decompensation. Be Easily Adjusted. Keep Constant Force On Curves. Be As Comfortable As Possible.
NATURAL HISTORY:
RISK OF CURVE PROGRESSION.
CURVE PROGRESSION Age.
Older Children Are Less Likely to Progress at Curve Magnitudes That Are Progressive in Younger Children.
Magnitude. Larger Curves Are More “Unstable” Than
Smaller. Curve Pattern.
Thoracic and Double Primary Curves Progress Less Than Single Lumbar or Thoracolumbar Curves.
Risk of Progression by Risser Sign. Lonstein and Carlson 1984 JBJS
22%
1.6%
68 %
23 %
0%
10%
20%
30%
40%
50%
60%
70%
80%
5-19 deg. 20-29 deg.
% Progressed
Risser 0-1
Risser 2-4
Risk of Progression by Chronological Age.Lonstein and Carlson 1984 JBJS
45%
23%8%4%
100%
61%
37%
16%
0%
20%
40%
60%
80%
100%
5-19 deg 20-29 deg
% Progressed up to 10 yrs
11-12 yrs
13-14 yrs
15 and older
LONG-TERM CURVE PROGRESSION. (Avg. F/U 40 Years Post Diagnosis) From Weinstein et. al. 1984 JBJS
0%
10%
29%
0%
10%
20%
30%
40%
50%
< 30 Deg 30-50 Deg 50-75 Deg
% Progressed
Weinstein Zavala and Ponsetti 1984 JBJS
68% progressed > 5 degrees. 37% progressed in last 10
years. (avg. F/U 40 years post diagnosis.)
TREATMENT OUTCOME
EXPECTATIONS.
Moe and Kettleson. 1970 JBJS
169 Patients Treated With Milwaukee Brace.
23% Average Correction of Thoracic Curves Post-treatment.
18% Average Correction of Lumbar and Thoracolumbar Curves Post-treatment.
Short Term Results.
Carr et. al. JBJS 1980
Re-Reviewed Moe’s Patients From 1970. Reported on Late Losses of Correction. Showed Late Losses of Correction. Results Showed Residual Curves Still
Less Than Pre-orthosis Magnitude.
Residual Curve 5-Years Post-Treatment By Menarche Value at Initiation Of Orthosis.
Bunch and Patwardhan, Chapter 13, Scoliosis; Making Clinical Decisions. 1989.
63%
80%100%
0%10%20%30%40%50%60%70%80%90%
100%
18 - 6 Mo. Pre 6 Pre - 6 Post 6-18 Post
Residual Curve as % of Initial Curve
Surgical Rates Following Orthotic Treatment
Based on Initial Risser Sign. From: Milwaukee Brace Treatment Of Ais. Lonstein and Winter. JBJS 1994
32%
12%
45%
18%
0%
10%
20%
30%
40%
50%
60%
20-29 DEG 30-39 DEG
% of Patients Requiring Surgery After Orthotic Treatment
Risser 0 -1
Risser 2+
Bunch Reported Best Curve Reduction for Youngest Group
and Lonstein Reported Highest Surgical Rates for Youngest
Group?
Orthotic Outomes; Failure Boundary
PART-TIME VERSUS
FULL-TIME
49%60% 62%
91%99%
0%10%20%30%40%50%60%70%80%90%
100%
Control Charleston Brace 16-Hour TLSO 23-Hour TLSO 23 HourMilwaukee Brace
Weighted Mean Proportion Of Success
A META-ANALYSIS OF THE EFFICACY OF NONOPERATIVE TREATMENT FOR IDIOPATHIC SCOLIOSIS. Rowe et al. - J Bone and Joint Surgery [Am]. 79-A (5) 664-674, 1997.)
A Comparison Between The Boston Brace And The Charleston Bending Brace In Adolescent Idiopathic Scoliosis.
Katz DE, Richards S, Browne RH, Herring JA. Spine, 22(12); 1302-1312 ,1997.
61%
41%
19%
31%
0%
20%
40%
60%
80%
Success (p=0.001) Surgery (p= 0.021)
Risser 0-1 Patients Only
BostonBrace
CharlestonBrace
Primary Goals. Correct Curves >50%. Maintain Correction Throughout Duration
of Wear. Address Psycho-social Issues. Fulltime Until Proven Otherwise. Maximal Comfort. Minimal Structure.
Summary Orthoses Must Improve Stability To Yield
Optimal Outcome!Optimizing Orthotic Treatment Requires; 1. Proper Patient Selection (Age, Magnitude,
Documented Progression). 2.Utilization of All Mechanisms of Action to
Improve Stability. 3. Frequent Follow-Up Adjustments To Restore
Orthosis to Optimal Fit and Function.
4. Sound Clinical Procedures!
In-Orthosis Correction of the Curve Should Always Exceed 50%
Orthosis Should NOT Increase Decompensation.
When Curve Appears to Progress From “Best In Brace” Magnitude, Orthosis Should Be Adjusted To Restore Curve Reduction.
Weaning Should Be Gradual!
Summary
Thank You For Your Attention!
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