Knee strength, power and stair performance of the elderly 5 years after unicompartmental knee arthroplasty

  • Yumeng Li
  • Rumit S. Kakar
  • Yang-Chieh Fu
  • Ormonde M. Mahoney
  • Tracy L. Kinsey
  • Kathy J. Simpson
Original Article • KNEE - ARTHROPLASTY



Unicompartmental knee arthroplasty (UKA) has been shown to demonstrate some satisfactory short-term outcomes. However, to our knowledge, there have been no reports on midterm or long-term knee extensor strength and leg extensor power post-UKA.


Therefore, the purposes of this study were: (1) to assess the isokinetic knee extensor strength, leg extensor power and stair performance of elderly participants at 5 years UKA post-operation; (2) to compare the differences in knee extensor strength and leg extensor power between the UKA and contralateral healthy limbs.


Nineteen elderly participants (75 ± 5 years) who had a medial or a lateral compartment UKA at 5 years post-operation were recruited. The isokinetic knee extensor strength and leg extensor power were measured. The stair performance was tested on a 4-step stair, and ascent and descent velocities were calculated. The pain level was assessed.


The UKA limbs’ knee extensor strength and leg extensor power were 1.01 ± 0.39 Nm/kg and 0.98 ± 0.27 W/kg, respectively. The stair ascent and descent velocities were 0.37 ± 0.07 and 0.38 ± 0.11 m/s, respectively. In addition, the UKA limbs exhibited comparable knee strength and leg power relative to the contralateral limbs.


In general, the knee extensor strength and leg extensor power exhibited by the UKA limbs at 5 years post-operation may be typical in comparison with the normative data.


We suggest that UKA is a satisfactory treatment in regard to the recovery of knee strength, leg power and ability to climb up and down stairs.


Knee replacement Osteoarthritis Functional performance Knee extension torque 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national 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

© Springer-Verlag France SAS, part of Springer Nature 2018

Authors and Affiliations

  • Yumeng Li
    • 1
  • Rumit S. Kakar
    • 2
  • Yang-Chieh Fu
    • 3
  • Ormonde M. Mahoney
    • 4
  • Tracy L. Kinsey
    • 4
  • Kathy J. Simpson
    • 5
  1. 1.Department of KinesiologyCalifornia State University, ChicoChicoUSA
  2. 2.Department of Physical TherapyIthaca CollegeIthacaUSA
  3. 3.Institute of Biomedical EngineeringNational Taiwan UniversityTaipeiTaiwan
  4. 4.Athens Orthopedic ClinicAthensUSA
  5. 5.Department of KinesiologyUniversity of GeorgiaAthensUSA

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