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Uncemented monoblock trabecular metal posterior stabilized high-flex total knee arthroplasty: similar pattern of migration to the cruciate-retaining design - a prospective radiostereometric analysis (RSA) and clinical evaluation of 40 patients (49 knees) 60 years or younger with 9 years' follow-up
Umeå universitet, Medicinska fakulteten, Institutionen för kirurgisk och perioperativ vetenskap.
Umeå universitet, Medicinska fakulteten, Institutionen för kirurgisk och perioperativ vetenskap.
Umeå universitet, Medicinska fakulteten, Institutionen för kirurgisk och perioperativ vetenskap.
2019 (engelsk)Inngår i: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Background and purpose — Uncemented monoblock cruciate retaining (CR) trabecular metal (TM) tibial components in total knee arthroplasty (TKA) work well in the long-term perspective in patients ≤ 60 years. Younger persons expect nearly normal knee flexion after TKA, but CR implants generally achieve less knee flexion compared with posterior stabilized (PS) implants. Cemented PS implants have higher revision rate than CR implants. Can an uncemented monoblock PS TM implant be used safely in younger patients?

Patients and methods — 40 patients (49 knees) age ≤ 60 years with primary (20 knees) or posttraumatic osteoarthritis (OA) were operated with a high-flex TKA using an uncemented monoblock PS TM tibial component. Knees were evaluated with radiostereometric analysis (RSA) a mean 3 days (1–5) postoperatively, and thereafter at 6 weeks, 3 months, 1, 2, 5, and 9 years. Clinical outcome was measured with patient-related outcome measures (PROMs).

Results — The implants showed a pattern of migration with initial large migration followed by early stabilization lasting up to 9 years, a pattern known to be compatible with good long-term results. Clinical and radiological outcome was excellent with 38 of the 40 patients being satisfied or very satisfied with the procedure and bone apposition to the entire implant surface in 46 of 49 knees. Mean knee flexion was 130°. 1 knee was revised at 3 months due to medial tibial condyle collapse.

Interpretation — The uncemented monoblock PS TM implant works well in younger persons operated with TKA due to primary or secondary OA.

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Taylor & Francis, 2019.
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URN: urn:nbn:se:umu:diva-161717DOI: 10.1080/17453674.2019.1626097ISI: 000473539500001PubMedID: 31210081OAI: oai:DiVA.org:umu-161717DiVA, id: diva2:1339229
Tilgjengelig fra: 2019-07-26 Laget: 2019-07-26 Sist oppdatert: 2019-07-26

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