Where is the most common location for supraspinous ligament desmitis?

Where is the most common location for supraspinous ligament desmitis?

• A. T9-T10
• B. T12-L2
• C. T15-L3
• D. T18-L2

Answer: (C)

Desmitis of the supraspinous ligament tends to occur where the back bears the most repetitive bending and load, which is at the thoracolumbar junction. The ligament runs along the tips of the dorsal spinous processes, and this transition zone between the thoracic and lumbar regions experiences significant flexion, extension, and muscle pull during locomotion, making it the area most prone to inflammation and irritation. That combination of high mechanical stress and the anatomy of the dorsal processes in this region explains why the caudal thoracic to cranial lumbar area is the typical site, roughly around T15 to L3. Among the options, this region best fits where kissing-spine–type changes are commonly seen. Other locations are less commonly affected because they involve areas with different stress patterns or anatomy.

Desmitis of the supraspinous ligament tends to occur where the back bears the most repetitive bending and load, which is at the thoracolumbar junction. The ligament runs along the tips of the dorsal spinous processes, and this transition zone between the thoracic and lumbar regions experiences significant flexion, extension, and muscle pull during locomotion, making it the area most prone to inflammation and irritation. That combination of high mechanical stress and the anatomy of the dorsal processes in this region explains why the caudal thoracic to cranial lumbar area is the typical site, roughly around T15 to L3. Among the options, this region best fits where kissing-spine–type changes are commonly seen. Other locations are less commonly affected because they involve areas with different stress patterns or anatomy.