Abstract
Background
Knee joint distraction (KJD) is a surgical joint-preserving treatment in which the
knee joint is temporarily distracted by an external frame. It is associated with joint
tissue repair and clinical improvement. Initially, patients were submitted to an eight-week
distraction period, and currently patients are submitted to a six-week distraction
period. This study evaluates whether a shorter distraction period influences the outcome.
Methods
Both groups consisted of 20 patients. Clinical outcome was assessed by WOMAC questionnaires
and VAS-pain. Cartilaginous tissue repair was assessed by radiographic joint space
width (JSW) and MRI-observed cartilage thickness.
Results
Baseline data between both groups were comparable. Both groups showed an increase
in total WOMAC score; 24 ± 4 in the six-week group and 32 ± 5 in the eight-week group (both p < 0.001). Mean JSW increased 0.9 ± 0.3 mm in the six-week group and 1.1 ± 0.3 mm in the eight-week group (p = 0.729 between groups). The increase in mean cartilage thickness on MRI was 0.6 ± 0.2 mm in the eight-week group and 0.4 ± 0.1 mm in the six-week group (p = 0.277).
Conclusions
A shorter distraction period does not influence short-term clinical and structural
outcomes statistically significantly, although effect sizes tend to be smaller in
six week KJD as compared to eight week KJD.
Keywords
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Article info
Publication history
Published online: May 27, 2016
Accepted:
May 3,
2016
Received in revised form:
April 16,
2016
Received:
October 7,
2015
Identification
Copyright
© 2016 Elsevier B.V. All rights reserved.
