1. Hey Groves' method of proximal osteosynthesis was performed in fifteen experiments on dogs. It was found that round nails were inadequate for fixation of the fragments of intracapsular osteotomy of the neck of the femur without external fixation.
2. Satisfactory contact and adequate fixation of the fragments of intracapsular osteotomy of the neck of the femur in dogs was obtained by a rustless steel screw of a special pattern which was practically inert in bone.
3. Early functional stimulation of the circulation is of prime importance in the healing process of intracapsular fracture of the hip.
4. Early, continuous, and accurate contact, with absolute fixation of the fractured surfaces, is of paramount importance in the healing of fractures in the presence of synovial fluid.
5. The capital fragment, devoid of all soft parts, in intracapsular osteotomy of the neck of the femur of the dog, readily unites and revivifies under the proper physiological conditions essential to the healing process in bone.