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Randomized Controlled Trial
. 2018 Jan;100-B(1 Supple A):76-82.
doi: 10.1302/0301-620X.100B1.BJJ-2017-0605.R1.

A functional comparison of medial pivot and condylar knee designs based on patient outcomes and parameters of gait

B Benjamin  1 , J R T Pietrzak  1 , J Tahmassebi  1 , F S Haddad  2
Affiliations
Randomized Controlled Trial

A functional comparison of medial pivot and condylar knee designs based on patient outcomes and parameters of gait

B Benjamin et al. Bone Joint J. 2018 Jan.

Abstract

Aims: The outcome of total knee arthroplasty (TKA) is not always satisfactory. The purpose of this study was to identify satisfaction and biomechanical features characterising the gait of patients who had undergone TKA with either an anatomical single radius design or a medial pivot design. We hypothesised that the latter would provide superior function.

Patients and methods: This is a study of a subset of patients recruited into a prospective randomised study of a single radius design versus a medial pivot design, with a minimum follow-up of one year. Outcome measurements included clinical scores (Knee Society Score (KSS) and Oxford Knee Score (OKS)) and gait analysis using an instrumented treadmill.

Results: There was no statistically significant difference between the two groups for both the KSS and OKS. There was also no statistical significance in cadence, walking speed, stride length and stance time, peak stride, mid support and push-off forces.

Conclusion: This study corroborates a previous study by the same authors that showed equally good results in clinical outcome and gait between the conventional single radius and medial pivot designs under stringent testing conditions. Cite this article: Bone Joint J 2018;(1 Supple A)100-B:76-82.

Keywords: Clinical scores; Gait; Medial pivot knee.

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Figures

Fig. 1
Fig. 1
Anatomical single radius design.
Fig. 2
Fig. 2
MCBS design.
Fig. 3
Fig. 3
Graph showing analysis of the pattern of gait using force plates built into treadmill. Red is for left and blue is for right lower limbs.
Fig. 4
Fig. 4
Analysis of parameters of gait.
Figs. 5a - 5c
Figs. 5a - 5c
Analysis of parameters of force in gait: a) peak force in stride (p = 034); b) mid support force in stride (p = 0.17); c), push-off force (p = 0.74).
Figs. 5a - 5c
Figs. 5a - 5c
Analysis of parameters of force in gait: a) peak force in stride (p = 034); b) mid support force in stride (p = 0.17); c), push-off force (p = 0.74).
Figs. 5a - 5c
Figs. 5a - 5c
Analysis of parameters of force in gait: a) peak force in stride (p = 034); b) mid support force in stride (p = 0.17); c), push-off force (p = 0.74).
See this image and copyright information in PMC

References

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