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Lack of Axial Rotation in Mobile-bearing Knee Designs

  • Symposium: Papers Presented at the Annual Meetings of the Knee Society
  • Published:
Clinical Orthopaedics and Related Research

Abstract

It has often been assumed rotational kinematics are improved with mobile-bearing TKA designs as the terms mobile-bearing and rotating platform imply. We tested this assumption by assessing the in vivo axial rotation magnitudes and patterns of 527 knees implanted with 12 different mobile-bearing TKA designs. Implants were grouped and compared by type—posterior stabilized (PS), posterior cruciate retaining (PCR), and posterior cruciate sacrificing (PCS)—and by specific design. We hypothesized all three mobile-bearing types (PS, PCR, and PCS) would achieve greater than 10° average axial rotation and we would find no differences in axial rotation between types. Only 14% of PS knees, 3% of PCS knees, and 17% of PCR knees attained greater than 10° axial rotation when measured from 0° to 90°. The percentage of PCS knees with greater than 10° axial rotation was less compared with the other two groups. Axial rotation averaged 4.3°, 2.5°, and 3.8° for the PS, PCS, and PCR knees, respectively. Incidences of reverse rotation were observed in 17% of PS knees, 32% of PCS knees, and 28% of PCR knees. Compared with the PCS group, the PS group achieved greater average axial rotation and had a lower percentage of knees displaying incidences of reverse rotation. The data refuted the hypotheses.

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Authors and Affiliations

  1. Grant Medical Center, Columbus, OH, USA

    Ray C. Wasielewski MD, MS & Kate C. Sheridan BS

  2. Minimally Invasive Orthopedics, Inc., 500 East Main Street, Suite 240, Columbus, OH, 43215, USA

    Ray C. Wasielewski MD, MS

  3. Center for Musculoskeletal Research, University of Tennessee, Knoxville, TN, USA

    Richard D. Komistek PhD, Sumesh M. Zingde MS & Mohamed R. Mahfouz PhD

Authors
  1. Ray C. Wasielewski MD, MS
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  2. Richard D. Komistek PhD
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  3. Sumesh M. Zingde MS
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  4. Kate C. Sheridan BS
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  5. Mohamed R. Mahfouz PhD
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Corresponding author

Correspondence to Ray C. Wasielewski MD, MS.

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Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

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Wasielewski, R.C., Komistek, R.D., Zingde, S.M. et al. Lack of Axial Rotation in Mobile-bearing Knee Designs. Clin Orthop Relat Res 466, 2662–2668 (2008). https://doi.org/10.1007/s11999-008-0354-9

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  • DOI: https://doi.org/10.1007/s11999-008-0354-9

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