Which factor related to cord tethering contributes to progressive deformities?

• A. Development of spasticity and motor strength loss associated with cord tethering
• B. Decreased spasticity with time
• C. Stable motor function regardless of tethering
• D. Increased bone density

Answer: (A)

Cord tethering leads to progressive deformities because, as a child grows, the tethered spinal cord is pulled tighter, causing ongoing traction and impaired neural function. This growing stretch can produce new or worsening spasticity and loss of motor strength, which shifts muscle balance around joints and promotes deformities such as scoliosis and leg or foot abnormalities. The key idea is that the tethered cord causes gradual neurological deterioration over time, and that progression of motor and tone changes is what drives the progressive deformities.

Decreased spasticity with time isn’t typical for tethering and would imply improvement, which doesn’t fit the pattern. Stable motor function despite tethering would not explain worsening deformities. Increased bone density isn’t related to the tethering process or the development of these deformities.