[When to think of a constructional bone disease?].

When to think of a constitutional bone disease?. Constitutional bone diseases are a heterogenous group of disorders, variably causing: growth anomalies, joint limitation and/or hypermobility, pain, bone frailty and/or dysmorphic elements in the craniofacial sphere and the extremities. Clinical examination, radiographies with a phosphocalcic test allow to guide the diagnosis. Medical therapy for these pathologies is most of the time symptomatic, combining painkillers, kinesitherapy, and functional and/or surgical orthopedic treatment. Genetic consultation is essential to confirm the diagnosis, possibly suggest the adequate molecular analysis, discuss the genetic counselling and suggest an outline of medical therapy.