[The hip in vertebral hyperostosis].

The study of two series of cases affected by vertebral hyperostosis allows the authors to underline the frequency with which the hip joint is affected and to describe the destructive forms seen in hyperostosis of the hip. In a first series of 101 cases the authors picked up 145 pathological hips which were probably or surely associated with hyperostosis. These hip disorders presented in three types: Type I (already described by J. Forestier et al.) with peri-articular proliferation and radiological integrity of the joint space; Type II with hyperostotic proliferation and narrowing of the joint space; Type III with epiphysial destruction. The study of a second series "of the development of 58 cases of hyperostotic hip disease" followed for 2-16 years raises the consideration that these three types are in fact three stages in the evolution of the condition.