DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS

M R Downing; P Ashcroft; D Lawrie; J Hutchison; D Knight; W Ledingham; P Gibson

doi:10.1302/0301-620X.86BSUPP_I.0860071c

Article alerts Social media

Current issue

DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS

M R Downing
P Ashcroft
D Lawrie
J Hutchison
D Knight
W Ledingham
P Gibson

DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS

Downing MR, Ashcroft P, Lawrie D, et al. DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS. Orthop Procs. 2004;86-B(SUPP_I):71-71. doi:10.1302/0301-620X.86BSUPP_I.0860071c

Downing, M R, et al. “DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS.” Orthopaedic Proceedings, vol. 86-B, no. SUPP_I, 2004, pp. 71-71., https://doi.org/10.1302/0301-620X.86BSUPP_I.0860071c

Downing, M. R., Ashcroft, P., Lawrie, D., Hutchison, J., Knight, D., Ledingham, W., & Gibson, P. (2004). DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS. Orthopaedic Proceedings, 86-B(SUPP_I), 71-71. https://doi.org/10.1302/0301-620X.86BSUPP_I.0860071c

Downing, M. R., Ashcroft, P., Lawrie, D., Hutchison, J., Knight, D., Ledingham, W. et al. (2004) “DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS.” Orthopaedic Proceedings, 86-B(SUPP_I), pp. 71-71. Available at: https://doi.org/10.1302/0301-620X.86BSUPP_I.0860071c

Downing, M R, P Ashcroft, D Lawrie, J Hutchison, D Knight, W Ledingham, and P Gibson. “DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS.” Orthopaedic Proceedings 86-B, no. SUPP_I (2004): 71-71. https://doi.org/10.1302/0301-620X.86BSUPP_I.0860071c

Downing MR, Ashcroft P, Lawrie D, Hutchison J, Knight D, Ledingham W, et al. DIFFERING MIGRATION PATTERNS OF FOUR FEMORAL STEMS MEASURED USING RADIOSTEREOMETRIC ANALYSIS. Orthop Procs. 2004 Jan 1;86-B(SUPP_I):71-71. https://doi.org/10.1302/0301-620X.86BSUPP_I.0860071c

Copy to clipboard

BibTeX

EndNote

RIS

Abstract

Aims: To study prospectively the characteristic migration of four different cemented femoral stems using Radiostereometry.

Methods: 96 patients undergoing cemented femoral hip replacement for osteoarthritis were randomised to receive an Exeter (Howmedica Stryker), Ultima Tapered Polished Stem [TPS], Ultima straight stem [USS] (Johnson and Johnson) or Charnley Elite (Depuy/Johnson and Johnson) stem. RSA migration measurements were performed at postoperatively and at 6,12,18 and 24 months post surgery using the UMRSA system enhanced with locally developed software.

Results: Two significantly distinct patterns of distal migration in the y direction (subsidence) were seen compatible with previous studies. Tapered stems subsided rapidly by six months Exeter 0.85mm (+/−0.15) UTPS 0.85mm (+/−0.15) stabilising by 2 years Exeter 1.3mm(+/−0.35), UTPS 1.2mm(+/−0.25). The USS and Elite designs showed lower migrations of 0.1mm (+/−0.1) and 0.15 (+/−0.15) mm at six and 0.25mm(+/−0.15) and 0.35mm (+/−0.15) 24 months. For migrations and rotations in other directions differences were seen between prostheses with the same design concept. Whilst both the UTPS and Exeter exhibited posterior migration of the head, by 24 months this was expressed as a rotation about the transverse axis for the TPS and the axial axis for the Exeter. The Elite and USS differed in rates of posterior migration and varus tilt.

Conclusions: Patterns of migration for stems with the same design concept may vary due to subtle differences in prosthesis shape. These variations produce a distinct migration “signature” for each stem.

Theses abstracts were prepared by Mr Peter Kay. Correspondence should be address to him at The Hip Centre, Wrightington Hospital, Appley Bridge, Wigan, Lancashire WN6 9EP.