Endpoints: able to walk about the house, with or without crutches, or better (see Chapter 37 for discussion of mobility in osteogenesis imperfecta)
Factors associated with an increased probability of walking:
(1) rolling over (from prone to supine) before 8 months
(2) sitting without support before 9 months
(3) ability to get into a sitting position without support before 12 months
(4) standing without support before 12 months
(5) ability to get into a standing position without support before 12 months
Factors associated with a decreased probability of walking:
(1) osteogenesis imperfecta Type 3 or 4
(2) presence of dentinogenesis imperfecta
(3) presence of intramedullary rods in the lower extremities (worsens with increasing number of rods)
