Study of Plantar Pressure Pattern, Symmetry Index and Center of Pressure in Patients with Ankylosing Spondylitis: A Cross-Sectional Study

Document Type : Research Paper

Authors

1 Rheumatology Department, Clinical Research Development Center, Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermananshah, Iran.

2 Sports Injuries and Corrective Exercises Department, Sport Sciences Faculty, Tehran University, Tehran, Iran.

3 Rheumatology Department, Clinical Research Development Center, Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Abstract

Background and Aim: One of the problems of patients with ankylosing spondylitis (AS) is poor balance, fear of falling and consequently reduced daily activities. In this study, the aim was to compare the distribution of foot pressure distribution, postural sways and symmetry index compared to healthy individuals.
Material and Methods: Nineteen AS patients (age:43.35±11.12 years, BMI=26.91±4.94 kg/m2) and seventeen healthy men (age: 48.2±12.4 years, BMI=22.10±10.22 kg/m2) were included in the study. The foot pressure distribution was recorded by PT-scan system. Static test was used to determine the maximum foot pressure(N/cm2) and to determine the postural sways, the standard deviation of center of pressure(COP) was used at the medial-lateral and anterior-posterior plans. The symmetry index(SI) was also used to determine the symmetry in the plantar pressure distribution.
Results: Mean distribution of right and left foot pressure was significantly different between AS and healthy individuals(P=0.01). Also, the mean scores of COP (P=0.024), COP-path length(P=0.0001), standard deviation of medial-lateral(P=0.024), and anterior-posterior(P=0.028) sways were significant between the two groups. In addition, the mean scores of the SI between the right and left feet were significantly different between groups(P=0.013). However, there was no significant difference between the two groups in the distribution of foot pressure on the front and rear of the foot and the front and rear pressure SI(P>0.05).
Conclusion: AS can cause unilateral weight-bearing and expose patients to musculoskeletal disorders. Patients' balance is also reduced due to the flexed posture and displacement of the COP, which can put them at risk of falling.

Keywords

References

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