In long sitting, moderate assistance is needed to prevent loss of sitting at which spinal level?

• A. Upper thoracic level
• B. Mid-thoracic level
• C. Cervical level
• D. Lumbar level

Answer: (B)

Maintaining a sustained seated posture relies on trunk stability from the spinal segments that innervate the thoracic and upper lumbar trunk muscles. When the lesion is at the mid-thoracic level, trunk control is impaired enough that a person cannot hold long sitting without some external help, but not so severely that all sitting is lost. This is why moderate assistance is typically needed to prevent loss of sitting at this level. If the injury were higher (cervical or upper thoracic), more extensive support would be required because trunk control is further compromised. If the injury were lower (lumbar), trunk muscles are more preserved, allowing better autonomous sitting with little to no support.