Chronic atlanto-axial instability in Down syndrome

Area of Science:

• Orthopedics
• Radiology
• Genetics

Background:

• Down syndrome is associated with an increased risk of atlanto-axial instability.
• Understanding the progression and risk factors for this instability is crucial for patient management.

Purpose of the Study:

• To evaluate the prevalence and changes in atlanto-axial instability in patients with Down syndrome over time.
• To identify potential risk factors, such as age and sex, associated with the development of this instability.

Main Methods:

• Retrospective analysis of radiographs from 32 patients with Down syndrome.
• Assessment of atlanto-axial interval and presence of instability in 1970 and 1983.
• Correlation of instability with patient age, sex, and presence of accessory ossicles.

Main Results:

• The number of patients with atlanto-axial instability increased from 1 in 1970 to 7 in 1983.
• The average atlanto-odontoid interval significantly increased from 2.78 mm in 1970 to 6.93 mm in 1983 (p < 0.005).
• Instability developed in 7 patients and resolved in 4 patients between the study periods; it was more common in boys over 10 years old.

Conclusions:

• Atlanto-axial instability is a dynamic condition in Down syndrome that can develop or resolve over time.
• Older boys with Down syndrome appear to be at higher risk for developing atlanto-axial instability.
• Further research is warranted to understand the long-term implications and management strategies for this condition.