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Bent spine syndrome: computed tomographic study and isokinetic evaluation.
Michel Laroche1, Geraldine Ricq, Marie-Bernadette Delisle
1Department of Rheumatology, CHU Rangueil, 1 Avenue Jean Poulhès, 31403 Toulouse, France. laroche.m@chu-toulouse.fr
Muscle & Nerve
|March 1, 2002
Summary
Adults with bent spine syndrome (primary acquired lumbar kyphosis) show decreased muscle density and strength, particularly in the back and shoulder muscles. This suggests a late-onset muscle disorder affecting the girdle muscles.
Area of Science:
- Neurology
- Orthopedics
- Musculoskeletal Disorders
Background:
- Primary acquired lumbar kyphosis, or bent spine syndrome, is a condition often linked to late-onset muscle dystrophy affecting paravertebral muscles.
- Understanding the full extent of this myopathy is crucial for diagnosis and management.
Purpose of the Study:
- To compare spinal CT scans and muscle function (force, power, fatigability) in patients with primary acquired lumbar kyphosis and control subjects.
- To investigate the involvement of paravertebral, pelvic, and shoulder girdle muscles in this condition.
Main Methods:
- Spinal computerized tomography (CT) scans were used to assess muscle density.
- Isokinetic testing evaluated muscle force, power, and fatigability in spinal erector, pelvic, and shoulder girdle muscles.
- 23 patients with primary acquired lumbar kyphosis and 15 matched controls were included.
Main Results:
- Patients exhibited reduced spinal and shoulder muscle density compared to controls.
- Paravertebral muscles showed decreased force, power, and work done.
- Scapular and gluteus medius muscles demonstrated reduced work done after repetitive movements.
Conclusions:
- Primary acquired lumbar kyphosis in adults may stem from a late-onset girdle myopathy.
- The condition involves subclinical myopathic changes in the pelvic and shoulder girdle muscles.
- Findings highlight the importance of assessing girdle muscle function in patients with bent spine syndrome.