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Global Sagittal Spinal Compensation for Dropped Head Alignment
Hirosuke Nishimura1, Kenji Endo, Yasunobu Sawaji
1Department of Orthopedic Surgery, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan.
Spine
|February 2, 2023
Summary
Dropped head syndrome (DHS) involves loss of spinal sagittal alignment compensation. The degree of decompensation varies across DHS types, impacting treatment strategies.
Area of Science:
- Spine surgery
- Orthopedics
- Radiology
Background:
- Dropped head syndrome (DHS) treatment requires understanding global sagittal spinal alignment.
- Limited theoretical evidence exists on spinal sagittal compensation mechanisms in DHS.
Purpose of the Study:
- To clarify compensatory mechanisms among spinal sagittal alignment parameters in patients with DHS.
- To correlate radiographic measurements with different types of DHS.
Main Methods:
- Retrospective radiographic study of 116 patients with isolated neck extensor myopathy.
- Patients classified into positive imbalanced (P-DHS), balanced (B-DHS), and negative imbalanced (N-DHS) groups based on C7 sagittal vertical axis (SVA).
- Analysis of correlations among spinal sagittal alignment parameters.
Main Results:
- No correlation between C2-C7 angle and T1 slope in any DHS type.
- B-DHS maintained adjacent segment correlations; N-DHS showed no C2-C7 angle-TK correlation.
- P-DHS exhibited no TK-lumbar lordosis correlation.
Conclusions:
- Loss of cervicothoracic junction compensation is universal in DHS.
- Decompensation patterns differ: B-DHS (cervicothoracic), N-DHS (thoracic spine), P-DHS (thoracic and lumbar spine).
- Global sagittal spinal balance assessment is crucial for DHS treatment planning.
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