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Evaluation of periprosthetic bone mineral density and postoperative migration of humeral head resurfacing implants

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Authors:
  • Mechlenburg, Inger ;
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    Orcid logo0000-0001-5432-8691
    Department of Clinical Medicine - The Department of Orthopaedics E, ?AS, Department of Clinical Medicine, Health, Aarhus University
  • Klebe, Thomas Martin ;
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    Department of Clinical Medicine - Center for Planlagt Kirurgi, Silkeborg, Department of Clinical Medicine, Health, Aarhus University
  • Døssing, Kaj Verner ;
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    Orcid logo0000-0002-9657-6076
    Department of Clinical Medicine - Ortopædkirurgi, Viborg, Department of Clinical Medicine, Health, Aarhus University
  • Amstrup, Anders ;
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    Department of Radiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
  • Søballe, Kjeld ;
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    Department of Clinical Medicine - Ortopædkirurgisk afdeling E, THG, Department of Clinical Medicine, Health, Aarhus University
  • Stilling, Maiken
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    Orcid logo0000-0002-4530-2075
    Department of Clinical Medicine - Ortopædkirurgisk afdeling E, THG, Department of Clinical Medicine, Health, Aarhus University
Subtitle:
two-year results of a randomized controlled clinical trial
DOI:
10.1016/j.jse.2014.05.012
Abstract:
BACKGROUND: Implant migration, bone mineral density (BMD), length of glenohumeral offset (LGHO), and clinical results were compared for the Copeland (Biomet Inc, Warsaw, IN, USA) and the Global C.A.P. (DePuy Int, Warsaw, IN, USA) humeral head resurfacing implants (HHRIs). METHODS: The study randomly allocated 32 patients (13 women), mean age 63 years (range, 39-82 years), with shoulder osteoarthritis to a Copeland (n = 14) or Global C.A.P. (n = 18) HHRI. Patients were monitored for 2 years with radiostereometry, dual-energy X-ray absorptiometry, Constant Shoulder Score (CSS), and the Western Ontario Osteoarthritis of the Shoulder Index (WOOS). LGHO was measured preoperatively and 6 months postoperatively. RESULTS: At 2 years, total translation (TT) was 0.48 mm (standard deviation [SD], 0.21 mm) for the Copeland and 0.82 mm (SD, 0.46 mm) for the Global C.A.P. (P = .06). Five HHRI were revised, and in the interval before the last follow-up (revision or 2 years), TT of 0.58 mm (SD, 0.61 mm) for revised HHRI was higher (P = .02) than TT of 0.22 mm (SD, 0.17 mm) in nonrevised HHRI. A comparison of TT at the last follow-up (revision or 2 years) found no difference between the HHRIs (P = .12). Periprosthetic BMD decreased initially but increased continuously after 6 months for both HHRIs. At 2 years, BMD was 48% higher around the Copeland HHRI (P = .005). The mean difference in LGHO was significantly higher for the Copeland than for the Global C.A.P. HHRI (P = .02). Clinical results evaluated with CSS and WOOS improved over time for both implant groups (P < .01), with no differences between the groups. CONCLUSION: Both implants had only little migration and good clinical results. Periprosthetic BMD and LGHO both increased for the Copeland HHRI more than for the Global C.A.P HHRI.
Type:
Journal article
Language:
Danish
Published in:
Journal of Shoulder and Elbow Surgery, 2014, Vol 23, Issue 10, p. 1427-36
Main Research Area:
Medical science
Submission year:
2014
ID:
270962252

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