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Alexander Schuh, Alexander Ebert, Ulrich Holzwarth, Gnther Zeiler

Cementless Vektor-Titan stem in total hip arthroplasty / Der zementfreie Vektor-Titanschaft in der Hüftendoprothetik des Hüftgelenkes

Keywords: Vektor-Titan stem, uncemented, THR, atrophy, radiolucent lines, Vektor- Titanschaft, zementfrei, Hfttotalendoprothese, Atrophie, radiologische Aufhellungslinie

Introduction: Cementless THR is a well established, and a widely accepted optimal procedure for younger patients. The cementless Vektor- Titan stem is made of Ti6Al7Nb, has got the shape of a three-dimensional cone, and an optimal proximal anchoring property.

Materials and methods: The aim of this prospective study was to scrutinise the outcome of 250 Vektor-Titan stems in cementless THRs with an average follow-up time of 3.0 years (Min: 1, Max: 6). The average age of the patients including 148 women and 102 men was calculated with 54.6 years (Min: 22.5, Max: 77.7).

Results: The score according to Merle d'Aubigné improved from preoperative 9.3 (Min: 7, Max: 13) to postoperative 17.0 (Min: 14, Max: 18). Distal cortical hypertrophy and proximal atrophy was detected in 4 cases. Single atrophy of the proximal femur was found in additional 3 cases. Progressive radiolucent lines in zone 1 and 7 according to Gruen were observed in one case. Postoperative local and general complications were seen as two subfascial hematomas, two single dislocations, two recurrent dislocations of the hip prosthesis, 6 lesions of the sciatic nerve (one persisting), two deep venous thrombosis, two pneumonias, and one lethal pulmonary embolism. A stable proximal fixation was achieved in 242 of 250 cases (96,8 %).

Conclusion: The results of this study using the Vektor- Titan stem in cementless total hip arthroplasty showed that the principle of proximal fixation was optimized. Long term follow-up studies are needed to confirm these good results.

Biomedizinische Technik, Walter de Gruyter

Print ISSN: 0013-5585
Volume: 50, 02/2005
Pages: 30 - 34

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