The influence of the centre of rotation on implant survival using a modular stem hip prosthesis

Francesco Traina, Marcello De Fine, Federico Biondi, Enrico Tassinari, Andrea Galvani, Aldo Toni

Research output: Contribution to journalArticlepeer-review


The restoration of the hip centre of rotation in an anatomical position is considered to be relevant for total hip prosthesis survival. When the cup is implanted with a high centre of rotation, the lever arm of the abductor muscles is decreased, causing higher joint-reaction forces. Modular stems with varying lengths and geometries can be used to balance soft tissues, and ceramic bearing surfaces can be used to reduce the wear rate. Forty-four hip replacements performed with a high hip centre of rotation were matched with 44 performed with an anatomical centre of rotation. In all cases the preoperative diagnosis was dysplasia of the hip (DDH) and cementless modular neck prostheses with ceramic bearing surfaces were used. At nine years follow-up the mean Harris hip and WOMAC scores were not statistically different. All stems and cups were stable; the femoral offset was no different between the two groups (p=0.4) as leg-length discrepancy (p=0.25).

Original languageEnglish
Pages (from-to)1513-1518
Number of pages6
JournalInternational Orthopaedics
Issue number6
Publication statusPublished - Dec 2009

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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