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Outcomes after knee arthroplasty in extra-articular deformity

  • Fabricio Bolpato Loures
  • Wesley Correia
  • João Henrique Reis
  • Rodrigo Sattamini Pires e Albuquerque
  • Alan de Paula Mozela
  • Eduardo Branco de Souza
  • Phelippe Valente Maia
  • João Maurício Barretto
Original Paper
  • 58 Downloads

Abstract

Purpose

To assess functional outcomes in patients undergoing total knee arthroplasty (TKA) without previous corrective osteotomy for treatment of knee osteoarthritis associated with extra-articular deformity.

Methods

From January to December 2016, patients with knee osteoarthritis with extra-articular deformities who presented for preoperative assessment before TKA were evaluated prospectively. Physical and radiological characteristics were documented pre- and postoperatively.

Results

TKA was performed in 33 knees; 25 were considered for analysis. The mean age was 65.2 years (range, 48–79 years). Sixteen deformities were secondary to fractures and nine to failed osteotomies. The mean Knee Society Score (KSS) improved from 27.1 pre-operatively to 68.7 post-operatively (p = 0.000). Pre-operative mechanical axis ranged from 32° varus (negative) to 26° valgus. After correction, 20 knees were within 3° (varus or valgus) of mechanical alignment.

Conclusion

In patients with extra-articular deformities, TKA with asymmetric intra-articular resection and ligament balancing can relieve pain and realign the mechanical axis of the lower limb.

Keywords

Arthroplasty Extra-articular deformity Knee Mechanical axis 

Notes

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest.

Research involving human participants

The research project was approved by the institutional Research Ethics Committee with opinion number 2,046,597.

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Copyright information

© SICOT aisbl 2018

Authors and Affiliations

  • Fabricio Bolpato Loures
    • 1
    • 2
  • Wesley Correia
    • 1
  • João Henrique Reis
    • 1
  • Rodrigo Sattamini Pires e Albuquerque
    • 1
  • Alan de Paula Mozela
    • 1
  • Eduardo Branco de Souza
    • 1
  • Phelippe Valente Maia
    • 1
  • João Maurício Barretto
    • 1
  1. 1.Knee Surgery CenterInstituto Nacional de Traumatologia e Ortopedia (INTO)Rio de JaneiroBrazil
  2. 2.Rio de JaneiroBrazil

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