A total of 28 Spiron prosthesis were implanted in 26 patients (15 men, 11 women, mean age 51 years [range 34-64 years], mean BMI 28 kg/m(2) [range 21-39 kg/m(2)]) from August 2009 to January 2012. Diagnoses: 13 cases of primary osteoarthritis, 8 cases of secondary osteoarthritis, 5 cases of femoral head necrosis, and 2 cases of posttraumatic osteoarthritis. The mean surgery length was 93 min (range 70-121 min), the mean hospital stay was 9 days (range 6-16 days). Blood transfusion was not necessary in any of the cases. There were no immediate complications such as deep vein thrombosis, surgery requiring secondary bleeding, wound infection, nerve palsy, or dislocation of the hip. Postoperative radiologic examinations showed an average leg lengthening of 3 mm (range -10-19 mm). No varus deviation of the prosthesis was observed. The Harris Hip Score improved from 55.4 points (range 33.5-76.9 points) preoperative to 90.5 points (range 75.7-99.9 points) 3 months postoperative. In 1 case with aseptic loosening, replacement surgery was performed without complications.

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