“Conus” Uncemented Stem in Developmental Hip Dysplasia
Cherubino P, Zatti G, D’angelo F, Murena L, Monzeglio D.Hip
The purpose of this study was to evaluate 115 “Conus” uncemented stems at an average follow-up of 6 years (2–9 years). Seventeen patients were lost at follow-up for a final number of 98 stems in 75 patients. The clinical outcome of 71 hips (72%) was graded excellent, 25 (25%) were good, one (2%) fair and one (2%) poor. The average Harris Hip Score increased from 49.35 before operation to 96.30 at the time of the last follow-up.
None of the stems implanted required a revision for aseptic or septic loosening. Cortical hypertrophy or radiolucencies were never seen in any of the stems evaluated. Heterotopic ossification was seen in one hip (1%). Modification of the calcar was observed in 29 hips (30%) and they consisted in a slight rounding off of the proximal medial edge of the cut femoral neck.
These results encourage the use of this versatile stem which showed a good primary and secondary stability, with a good load distribution along the femur.
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