Advantages of the bimodular neck for THR: results of the first 100 Hélianthe femoral stems to at least 5-year follow-up

Autor: François Loubignac, Jacques Rebouillat
Rok vydání: 2005
Předmět:
Zdroj: European Journal of Orthopaedic Surgery & Traumatology. 15:90-100
ISSN: 1432-1068
1633-8065
DOI: 10.1007/s00590-004-0189-3
Popis: Mid-term results with a bimodular stem (neck and head) are reported: 76 implants were reviewed at a mean follow-up of 6.7 years (ranging from 5 to 11 years). The Helianthe femoral stem is manufactured from titanium alloy. It comes in seven sizes and is available with or without [hydroxyapatite (HA)-coated] cement. A bimodular neck couples with the stem and the prosthetic head through Morse cones. This unicentric retrospective study included 103 in 95 patients. All surgeries were performed between 1991 and 1997 following osteoarthritis requiring total hip arthroplasty (THA) in the majority of cases. Twenty-seven patients could not be reviewed (21 died and six were lost to follow-up). Therefore, out of a group of 68 patients (mean age 77.4 years), 76 hip operations were reviewed with a mean follow-up of 6.7 (5–11) years. Eight patients were considered as failures, with the implant being recognised as the cause in only five cases. Therefore, 68 hip operations were reviewed among 60 patients (eight bilateral cases) with a mean follow-up of 7.32 (5–11) years; these can be divided into 48 cemented stems and 20 HA-coated stems. All patients were evaluated clinically according to Harris and PMA scores. Radiographic evaluation included assessment of the centre of motion of the hip, lateralization and other aspects relating to implant osteointegration. Results were overall satisfactory, with a Harris hip score of 91.3 (50–100) and a PMA score of 16.4 (12–18). Radiographic evidence showed restoration of the centre of motion in most cases with a satisfactory implant fixation in both cemented and cementless stems. Survival rate at more than 8 years for 103 stems was 90%. The characteristics of this implant are in accordance with the most recent studies on biocompatibility and morphology requirements of implants indispensable to improve the life span of hip prostheses. However, the limited follow-up of this study does not provide completely reliable evidence for the choice of this modular stem. All patients need to be followed up for a longer period to validate the good tendency resulting after 8 years.
Databáze: OpenAIRE
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