When the structures outside the joint are affected, the term false ankylosis has been used in contradistinction to true ankylosis, in which the disease is within the joint.
When inflammation has caused the joint-ends of the bones to be fused together the ankylosis is termed "osseous" or complete and is an instance of synostosis.
He performed the first operation to cure the hip-joint ankylosis (stiffness) and introduced the method of suspending the patient followed by wrapping the body to correct spine distortions.
He originated the osteotomy for joint ankylosis, performing a femoral osteotomy between the greater and lesser trochanters; in 1826 he performed a hip osteotomy in seven minutes.
