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MINERVA ORTOPEDICA E TRAUMATOLOGICA
A Journal on Orthopedics and Traumatology
Minerva Ortopedica e Traumatologica 1999 June;50(3):97-102
The polar cup
Zagra L., Randelli F., Giacometti Ceroni R.
Background. The aim of this prospective study is to verify the clinical value of the theoretical bases of Polar™ cup. A consecutive series of 50 THR with this implant performed by the same surgeon is analysed. The average follow-up is 7 years and an half (ranging from 6 years and 9 months to 8 years).
Methods. Features and characteristics of Polar cup are described. As the postero-superior aspect of the acetabulum is relatively stable during the alternative loading of the gate, this cup is fixed by means of two pins of 6 mm diameter and a structured surface is present only in this side. The remaining part of the outer surface is smooth, so as to avoid any bonding between the prosthesis and the mobile bone. From this point of view this prosthesis is more similar to a bipolar prosthesis of the head of the femur seized up from the beginning in the right position, than to a real prosthesis of the acetabulum.
Results. DOVAC data forms were used for pre-and postoperative evaluation. Only one case of early cup loosening is reported, occurred in a Charcot hip. At the latest follow-up all the remaining 49 patients show an excellent both clinical and radiographical result of the acetabular component. Radiolucent lines were carefully evaluated.
Conclusions. Follow-up is too short for final conclusions, but so far the theoretical statements show effectiveness in the clinical outcome.