|Knee arthroplasty with a medially conforming ball-and-socket tibiofemoral articulation provides better function.|
|PMID: 20700674 Owner: NLM Status: MEDLINE|
|BACKGROUND: A knee design with a ball-and-socket articulation of the medial compartment has a femoral rollback profile similar to the native knee. Compared to a conventional, posterior-stabilized knee design, it provides AP stability throughout the entire ROM. However, it is unclear whether this design difference translates to clinical and functional improvement.
QUESTIONS/PURPOSES: We asked whether the medially conforming ball-and-socket design differences would be associated with (1) improved ROM; and (2) improved American Knee Society, WOMAC, Oxford Knee, SF-36, and Total Knee Function Questionnaire scores compared to a conventional, fixed-bearing posterior-stabilized TKA.
PATIENTS AND METHODS: We enrolled 82 patients in a single-center, single-blinded, randomized, controlled trial comparing the medially conforming ball-and-socket design knee prosthesis to a posterior-stabilized total knee prosthesis. Our primary end point was ROM. Our secondary end points were American Knee Society, WOMAC, Oxford Knee, SF-36, and Total Knee Function Questionnaire scores. All patients were followed at 1 and 2 years.
RESULTS: The mean ROM was 100.1° and 114.9° in the posterior-stabilized and medially conforming ball-and-socket groups, respectively. The physical component scores of SF-36 and Total Knee Function Questionnaire were better in the medially conforming ball-and-socket group. We found no difference in American Knee Society, WOMAC, and Oxford Knee scores.
CONCLUSIONS: Both implant designs similarly relieved pain and improved function. The medially conforming ball-and-socket articulation provided better high-end function as reflected by the Total Knee Function Questionnaire.
LEVEL OF EVIDENCE: Level I, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
|Fahad Hossain; Shelain Patel; Shin-Jae Rhee; Fares Sami Haddad|
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|Type: Comparative Study; Journal Article; Randomized Controlled Trial|
|Title: Clinical orthopaedics and related research Volume: 469 ISSN: 1528-1132 ISO Abbreviation: Clin. Orthop. Relat. Res. Publication Date: 2011 Jan|
|Created Date: 2010-12-24 Completed Date: 2011-01-25 Revised Date: 2013-05-29|
Medline Journal Info:
|Nlm Unique ID: 0075674 Medline TA: Clin Orthop Relat Res Country: United States|
|Languages: eng Pagination: 55-63 Citation Subset: AIM; IM|
|Department of Trauma & Orthopaedics, University College Hospital, 235 Euston Road, London NW1 2BU, UK. firstname.lastname@example.org|
|APA/MLA Format Download EndNote Download BibTex|
Activities of Daily Living
Aged, 80 and over
Arthroplasty, Replacement, Knee / adverse effects, instrumentation*
Knee Joint / physiopathology, radiography, surgery*
Pain, Postoperative / etiology, prevention & control
Range of Motion, Articular
Recovery of Function
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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