Investigation the effect of valgus unloading knee brace on gait harmonic ratio in patients with medial compartment knee osteoarthritis

Not Applicable

Conditions: Knee osteoarthritis.
Osteoarthritis of knee

Registration Number: IRCT20131225015932N15

Lead Sponsor: Shiraz University of Medical Sciences

Brief Summary: Not available

Detailed Description: Not available

Recruitment & Eligibility

Status: Complete

Sex: All

Target Recruitment: 20

Inclusion Criteria

Symptomatic unilateral knee osteoarthritis
Knee medial compartment involvement
Age 45-75 years
Ability to walk at least 15 meters without auxiliary equipment
K&L grade =2 (based on knee x-ray most related to one last year)
PI-NRS = 2

Exclusion Criteria

Articular and lower extremity fractures
History of knee and spine and lower extremity surgery in the past 6 months
knee and hip replacement
tibial osteotomy
Any soft, neurological or vascular tissue problems where wearing a brace is harmful for the long term, including varicose veins and skin problems
Obesity enough to make wearing a brace uncomfortable and uneffective (weighing more than 20% of ideal body weight)
Systemic or metabolic diseases including diabetes
Any condition or diseases other than osteoarthritis that affects walking, including stroke and Parkinson's
chronic low back pain
Ligamentous injuries of the lower extremities
Other rheumatologic diseases except knee osteoarthritis

Study & Design

Study Type: interventional

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Harmonic ratio measured with accelerometer. Timepoint: Baseline (before intervention) and one week after intervention (one month intervention). Method of measurement: Based on studies to calculate the harmonic gait ratio, accelerometer (Biomethrics) will be fitted to the lower lumbar vertebrae(l4-l5) at the lower back. Gait analysis will be performed using an accelerometer in the laboratory environment as individuals walk a 15-meter-long, horizontal path at their usual speed; a heel switch will be connected in the heel area of right foot to define the start of the walking cycle ; the linear acceleration of the trunk will be sampled along the anterior-posterior, medial-lateral, and vertical axes at a frequency of 200 Hz. Signal processing will be performed using matlab software. To calculate the harmonic ratio using fourier transformation, the contents of the in phase accelerated signals (even harmonics) are compared to the contents of out-of-phase signals (odd harmonics).

Secondary Outcome Measures