43 shoulder-joint replacements were performed in 42 patients using a constrained joint. 12 material failures were experienced in the first series of 22 shoulders and only 2 in the second, modified series (21 shoulders). Loosening of the glenoid components was not encountered, although radiolucent lines have been observed about some of the components. A basic feature of the design was to allow dislocation of the metal head from its cup when excessive motion of the components is attempted by the patient and a specific torque is exceeded. A method of insertion and design considerations allowed us to achieve strong attachment between the metal glenoid and the scapula.
Copyright remains with the authors and publisher.
43 shoulder-joint replacements were performed in 42 patients using a constrained joint. 12 material failures were experienced in the first series of 22 shoulders and only 2 in the second, modified series (21 shoulders). Loosening of the glenoid components was not encountered, although radiolucent lines have been observed about some of the components. A basic feature of the design was to allow dislocation of the metal head from its cup when excessive motion of the components is attempted by the patient and a specific torque is exceeded. A method of insertion and design considerations allowed us to achieve strong attachment between the metal glenoid and the scapula.
Copyright remains with the authors and publisher.