Musculoskeletal issues
§Rehabilitation:
•Scoliosis and decubiti
•contractures: adaptive equipment
§Osteopenia:
•decreased mobility/contractures
•anticonvulsants
•untreated hypogonadism
•fractures
§Trauma: behaviors,   sensory deficits
The musculoskeletal issues that may be encountered are many and diverse.  Scoliosis is common and may be severe enough to have a significant effect on lung function or to complicate positioning issues to the extent that skin breakdown occurs.  If the individual is wheelchair bound, finding a skilled durable medical equipment provider with experience in wheelchair seating systems will be important to provide patient comfort and optimal mobility as well as to prevent worsening of contractures or skin breakdown.  The same is true for extremity contractures.  Physical and occupational therapy may be sufficient to prevent decline and/or restore function.  However surgical evaluation should be sought if contractures, for example, are interfering with good skin care or ADLs or where repeated dislocations are occurring.
Immobility increases the risk for osteopenia.  Anticonvulsants and other drugs (e.g. prednisone) also contribute to bone loss as may untreated hypogonadism.  As a result, osteopenia is common in some persons with DD.  Metabolic bone screening is therefore recommended.  Treatment for osteopenia is multifactorial.  First, the underlying cause should be addressed.  Second, exercise should be encouraged (including weight bearing such as using walkers for those otherwise non-ambulatory individuals).  Finally, drug treatment (calcitonin, alendronate) are options to consider especially when fractures have occurred.  As always, ensuring adequate calcium intake starting in childhood is key.
The likelihood of trauma occuring is due to a number of contributing factors.  The individual may have sensory deficits that reduce self protection.  There may be problems with gait or judgement.  There may be lowered bodily resistance to injury (e.g. osteopenia). Environmental assessment and careful monitoring can reduce the risk of harm.