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Scandinavian Journal of Pain

Official Journal of the Scandinavian Association for the Study of Pain

Editor-in-Chief: Breivik, Harald


CiteScore 2018: 0.85

SCImago Journal Rank (SJR) 2018: 0.494
Source Normalized Impact per Paper (SNIP) 2018: 0.427

Online
ISSN
1877-8879
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Volume 16, Issue 1

Issues

Increased postural stiffness in patients with knee osteoarthritis who are highly sensitized

R.P. Hirata / S.T. Skou
  • Center for Sensory-Motor Interaction (SMI), Aalborg, Denmark
  • Orthopedic Surgery Research Unit, Aalborg University Hospital, Aalborg, Denmark
  • Research Unit for Musculoskeletal Function and Physiotherapy, Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
  • Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Region Zealand, Slagelse, Denmark
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ O. Simonsen
  • Center for Sensory-Motor Interaction (SMI), Aalborg, Denmark
  • Orthopedic Surgery Research Unit, Aalborg University Hospital, Aalborg, Denmark
  • Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ S. Rasmussen
  • Center for Sensory-Motor Interaction (SMI), Aalborg, Denmark
  • Orthopedic Surgery Research Unit, Aalborg University Hospital, Aalborg, Denmark
  • Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ T. Graven-Nielsen
Published Online: 2017-07-01 | DOI: https://doi.org/10.1016/j.sjpain.2017.04.028

Abstract

Aims

To evaluate the effect of widespread pain sensitization on postural stability during quiet standing tasks in patients with knee osteoarthritis.

Methods

Patients (56) stood quietly on a force platform for 1 min in 4 conditions (each repeated 3 times): (i) firm surface (FS) with open eyes (OE), (ii) FS with closed eyes (CE), (iii) soft foam surface (SS) with OE, and (iv) SS with CE. Postural stability was quantified by Center of Pressure (CoP) variables extracted from the force platform. Pressure pain thresholds (PPTs), were assessed bilaterally with a handheld pressure algometer (1 cm2 probe) at: (i) four sites in the knee region (3 cm medial to the midpoint of the medial edge of the patella; 2 cm proximal to the superior edge of the patella; 3 cm lateral to the mid-point of the lateral edge of the patella; and centre of the patella), (ii) tibialis anterior muscle, and (iii) extensor carpi radialis longus muscle. The PPT values from tibialis anterior and extensor carpi radialis longus muscles were used to divide the patients in high and low sensitization groups (two-steps clustering).

Results

PPT values at bilateral knees sites were lower in the high sensitivity [median (range) of all sites: 423 (153, 1129) kPa] compared with low sensitivity group [822 (305, 2051) kPa] (P < 0.05). CoP range in the anterior–posterior direction was reduced in high sensitivity group (41±16 mm) compared with the low sensitivity group (51±16 mm) during the SS with CE (P < 0.05) condition.

Conclusions

The lower CoP Range suggests stiffer postural strategy in patients with higher widespread pain sensitivity compared with low sensitivity patients during sensory restrictions. The lack of mobility found in high sensitivity patients under such restrictions might be related to the impaired integration of sensory information due to the parallel processing of the nociceptive information.

About the article

Published Online: 2017-07-01

Published in Print: 2017-07-01


Citation Information: Scandinavian Journal of Pain, Volume 16, Issue 1, Pages 173–174, ISSN (Online) 1877-8879, ISSN (Print) 1877-8860, DOI: https://doi.org/10.1016/j.sjpain.2017.04.028.

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