Hi there! I think there are a few theories about Ritalin and growth. But I emphasise, they are speculation.
i) Ritalin is an amphetamine and hence reduces appetite. If a child is not meeting his daily calorie intake, he will not thrive as well. When nutritionally deprived, a child does not grow as well.
ii) Ritalin causes a disruption in sleep pattern. Doctors advise not to take Ritalin in the late afternoon as it will cause difficulty in falling asleep. Growth hormone ( somatotrophin) is released during sleep. If an individual is sleep deprived, they do not release as much growth hormone. Children on Ritalin may have disrupted sleep and growth hormone may not be released in sufficient amounts to ensure optimal growth.
It has been observed that some children seem more prone to the growth retardation effects of ADHD drugs than others. Ritalin and other drugs like Strattera (atomoxetine) have been observed to cause slowed growth in only some individuals. Ritalin and Strattera improve the uptake of brain chemicals such as dopamine and boost the levels of norepinephrine in the brain.
I would very much like to know if Ritalin might slow bone healing. I believe this may be worthy of further research.
For example research has shown that alcoholics demonstrate poor bone healing. Alcohol causes an increased turnover of norepinephrine and dopamine in the brain. Alcoholics are often poorly nourished. Alcohol has an adverse effect on osteoblast activity, thus suppressing new bone formation.
Diabetes, poor weight bearing, steroids, malnutrition, poor blood supply...there is a long list of other causes of poor bone and tissue healing.
NSAIDs ( non steroidal anti-inflammatories) also delay or modify healing of bones.
The significant component at work appears to be the cox-2 enzyme (associated with inflammation and pain) that is blocked by these drugs. Is it possible your patient is taking NSAIDs and these are responsible for the poor bone healing?
Regards
fisiofriend