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Knee Surgery, Sports Traumatology, Arthroscopy
Published in: Knee Surgery, Sports Traumatology, Arthroscopy 3/2017

01-03-2017 | Knee

Early functional outcome after lateral UKA is sensitive to postoperative lower limb alignment

Authors: J. P. van der List, H. Chawla, J. C. Villa, H. A. Zuiderbaan, A. D. Pearle

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 3/2017

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Abstract

Purpose

The predictive role of patient-specific characteristics and radiographic parameters on medial unicompartmental knee arthroplasty (UKA) outcomes is well known, but knowledge of these predictors is lacking in lateral UKA. Therefore, purpose of this study was to assess the predictive role of these parameters on short-term functional outcomes of lateral UKA.

Methods

In this retrospective cohort study, Western Ontario and McMaster Universities Arthritis Index scores were collected at 2-year follow-up (median 2.2 years, range 2.0–4.0 years) in 39 patients who underwent lateral UKA. Patient-specific characteristics included age, BMI and gender, while radiographic parameters included osteoarthritis severity of all three compartments and both preoperative and postoperative hip-knee-ankle alignment.

Results

BMI, gender, age and preoperative valgus alignment were not correlated with functional outcomes, while postoperative valgus alignment was correlated with functional outcomes (0.561; p = 0.001). Postoperative valgus of 3°–7° was correlated with better outcomes than more neutral (−2° to 3° valgus) alignment (96.7 vs. 85.6; p = 0.011). Postoperative alignment was a predictor when corrected for patient-specific characteristics (regression coefficient 4.1; p < 0.001) and radiological parameters (regression coefficient 3.8; p = 0.002).

Conclusions

Postoperative valgus alignment of 3°–7° was correlated with the best short-term functional outcomes in lateral UKA surgery, while patient-specific parameters and preoperative alignment were not correlated with functional outcomes. Based on these findings, a surgeon should aim for valgus alignment of 3°–7° when performing lateral UKA surgery for optimal functional outcomes.

Level of evidence

Prognostic study, Level II.
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Metadata
Title
Early functional outcome after lateral UKA is sensitive to postoperative lower limb alignment
Authors
J. P. van der List
H. Chawla
J. C. Villa
H. A. Zuiderbaan
A. D. Pearle
Publication date
01-03-2017
Publisher
Springer Berlin Heidelberg
Published in
Knee Surgery, Sports Traumatology, Arthroscopy / Issue 3/2017
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-015-3877-0

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