Hybrid total hip arthroplasty using specifically-designed stems for patients with developmental dysplasia of the hip. A minimum five-year follow-up study |
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Authors: | Hiroshi Ito Hiromasa Tanino Yasuhiro Yamanaka Toshiki Nakamura Takeo Matsuno |
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Institution: | (1) Department of Orthopaedic Surgery, Asahikawa Medical University, Midorigaoka Higashi 2-1-1-1, Asahikawa 078-8510, Japan |
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Abstract: | A 4-U hybrid total hip arthroplasty (THA) system was specifically designed for patients with developmental dysplasia of the
hip (DDH). Straight stem with an appropriate offset and various size variations are advantages. We followed 128 hips in 124
patients, 13 men and 111 women, for a mean of 6.5 years (range, 5.0–7.5 years). Two acetabular and femoral components in two
patients had been revised for infection, one acetabular component had been revised for recurrent dislocation, and one femoral
component had been revised for periprosthetic femoral fracture. None of the acetabular or femoral components were revised
for loosening or were found to be loose at follow-up. The Harris hip score increased from a preoperative average of 42 points
to 88 points at the most recent follow-up. Primary THA using the 4-U system had a good mid-term result in patients with DDH.
This system could be applied for all patients including those with the narrowest and deformed femurs. |
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Keywords: | |
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