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We treated forty-eight femoral-shaft fractures in forty-seven patients with the Grosse-Kempf interlocking intramedullary nail. Fifteen fractures were transverse or short oblique, ten were long oblique or spiral, and twenty-three were comminuted. Only twenty-four (50 per cent) of the fractures were located in the middle one-third of the shaft. The median time until full weight-bearing was thirty days (range, seven to 150 days). Radiographic consolidation was seen in all fractures at a median of sixteen weeks (range, nine to fifty-six weeks). The patients were followed for one to four years, and no infections developed. The results in thirty fractures were classified as excellent; in eight, as good; in seven, as fair; and in two, as poor. We have found the Grosse-Kempf method to be useful in treating patients with high-energy fractures, multiple injuries, open fractures, and osteoporosis. Since there is a risk of rotational and longitudinal instability with the dynamic method of interlocking nailing, we recommend that the static method be used whenever there is doubt about the stability of the fracture. We did not observe any delay in bone-healing when the static method was used.