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Ann R Coll Surg Engl. 2019 Jul;101(6):391-398. doi: 10.1308/rcsann.2019.0016. Epub 2019 Jun 3.

Comparison of gait kinematics in total and unicondylar knee replacement surgery.

Author information

1
Institute of Motion Analysis & Research (IMAR), Department of Orthopaedics & Trauma Surgery, TORT Centre, Ninewells Hospital & Medical School, University Of Dundee , Dundee DD19SY , UK.

Abstract

INTRODUCTION:

This study is aimed to compare kinematic gait data of patients who have undergone total and unicondylar knee replacement.

MATERIALS AND METHODS:

This single-surgeon retrospective cohort study evaluated 13 patients with unilateral total knee arthroplasty (TKA) and 14 unicondylar knee arthroplasty (UKA). Gait analysis was carried out using a Vicon motion analysis system. The limits of knee flexion during stance phase, at heel strike and at loading response were measured.

RESULTS:

The total range of motion of the UKA knees was significantly greater than the TKA knees. UKA knees exhibited significantly greater knee extension during the stance phase than the TKA knees. Unlike TKA, UKA knees demonstrated improved knee flexion during the gait cycle when compared to the contralateral non-operated knee. The hips also demonstrated near normal hip flexion in UKA patients. Predictably, UKA knees had significantly greater varus compared with TKA in the coronal plane. Spatiotemporal variables demonstrated similar walking speed and step length to aid a fair comparison between knee replacement groups.

CONCLUSIONS:

The UKA knees moved more physiologically in the sagittal plane with a greater range of motion during gait. Despite having a stiff gait pattern, the patients undergoing TKA demonstrated a more neutral alignment in the coronal plane. Neither type of knee arthroplasty restored knee kinematics to those of the non-operated side.

KEYWORDS:

Gait analysis; Kinematics; Total knee arthroplasty; Unicondylar knee arthroplasty

PMID:
31155888
PMCID:
PMC6554568
DOI:
10.1308/rcsann.2019.0016
[Indexed for MEDLINE]

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