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      A titanium plasma-sprayed cup with and without hydroxyapatite-coating: a randomised radiostereometric study of stability and osseointegration.

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          Abstract

          We present a prospective, two-centre radiostereometric analysis (RSA) regarding the stability of a flattened pole titanium press-fit cup (EP-FIT PLUS), and whether additional hydroxyapatite coating leads to faster bone ingrowth into the porous coating. Forty-two postmenopausal female patients (44 hips) undergoing total hip arthroplasty for primary osteoarthritis, selected to avoid hormonal factors influencing bone metabolism, were randomised to receive this cup with a titanium-plasma-sprayed surface with or without an additional hydroxyapatite coating. RSA was used to measure cup translation and rotation along three cardinal axes with respect to the host bone at the following time points: immediately postoperatively, at 6 weeks, and at 3, 6, 12, and 24 months. The most pronounced translation was proximal (0.11 mm) and posterior tilt (-0.27°). No difference in translation and rotation could be detected between the two groups. With the exception of one cup with an isolated radiolucent line <2 mm in zone 1, all cups showed complete osseointegration on conventional radiographs. The flattened pole cup provided excellent early stability and no advantage could be detected with additional hydroxyapatite coating.

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          Author and article information

          Journal
          Hip Int
          Hip international : the journal of clinical and experimental research on hip pathology and therapy
          SAGE Publications
          1724-6067
          1120-7000
          January 19 2013
          : 23
          : 1
          Affiliations
          [1 ] Privatklinik Bethanien, Zurich, Switzerland. urs.munzinger@klinikbethanien.ch
          Article
          E753041A-6367-424B-8285-D37FB0B18284
          10.5301/HIP.2013.10598
          23329538
          65059f6d-b342-4c84-ae2f-bf487621b2b3
          History

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