title: Prospective randomised clinical trial assessing subsidence and rotation, using radiostereometric analysis, of two modular cementless femoral stems (Global K2 and Apex).
abstract: OBJECTIVE
  To accurately assess subsidence, rotation and clinical scores in two cementless femoral stems.
  
  
  METHODS
  260 patients received either K2 or Apex femoral stems and were studied over 2y, with RSA and clinical scores.
  
  
  RESULTS
  Mean Oxford Hip score for both stems was excellent (45.78 and 46.76). Very little subsidence or rotation were noted on RSA in either stem. There were no statistically significant differences in clinical scores, or radiological motion between stems. Revision rate was 0.8% over the study period.
  
  
  CONCLUSIONS
  Excellent clinical and RSA scores over the 2y study period predict good long term outcomes for these stems.
authors.affiliation: Perth Bone and Tissue Bank, Verdun Street, Nedlands, Western Australia 6009, Australia ; Hollywood Private Hospital, Verdun Street, Nedlands, Western Australia 6009, Australia ; University of Western Australia, Nedlands, Western Australia 6009, Australia.
authors.forename: Mark
authors.initials: M
authors.lastname: Edmondson
authors.affiliation: Perth Bone and Tissue Bank, Verdun Street, Nedlands, Western Australia 6009, Australia ; Hollywood Private Hospital, Verdun Street, Nedlands, Western Australia 6009, Australia ; University of Western Australia, Nedlands, Western Australia 6009, Australia.
authors.forename: Jay
authors.initials: J
authors.lastname: Ebert
authors.affiliation: Perth Bone and Tissue Bank, Verdun Street, Nedlands, Western Australia 6009, Australia ; Hollywood Private Hospital, Verdun Street, Nedlands, Western Australia 6009, Australia ; University of Western Australia, Nedlands, Western Australia 6009, Australia.
authors.forename: Oscar
authors.initials: O
authors.lastname: Nivbrant
authors.affiliation: Perth Bone and Tissue Bank, Verdun Street, Nedlands, Western Australia 6009, Australia ; Hollywood Private Hospital, Verdun Street, Nedlands, Western Australia 6009, Australia ; University of Western Australia, Nedlands, Western Australia 6009, Australia.
authors.forename: David
authors.initials: D
authors.lastname: Wood
keywords: Modular cementless stems; Radiosteriometric analysis
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