Affiliation:
1. Department of Physical Medicine and Rehabilitation, Baskent University Faculty of Medicine, Adana, Turkey
2. Department of Radiology, Baskent University Faculty of Medicine, Adana, Turkey
Abstract
Purpose:
The Insall-Salvati Index (ISI) is the ratio of the patellar tendon length to the
length of the patella. This ratio is the most commonly used method for evaluating patellar placement
and patellofemoral imbalance. The position of the patella is important for the knee joint function
and also for biomechanics. The abnormal position of the patella may lead to patellofemoral
malalignment and instability. Herein, we aimed to analyze the relationship between the ISI and
pain, physical function, muscle strength, fall risk, and postural stability in patients with primary
knee osteoarthritis (OA).
Methods:
Sixty-two symptomatic knees of 45 patients (aged between 40 -75 years) who were suffering
from the primary knee OA according to the American College of Rheumatology criteria
were included retrospectively in the study. Patients with stages II and III osteoarthritis according to
the Kellgren-Lawrence (K/L) radiological grading system were included. The ISI was measured on
the lateral knee radiograph in a 30° flexed posture. Visual Analogue scale (VAS), Western Ontario
and McMaster Universities Osteoarthritis (WOMAC) and Lequesne indexes were recorded for evaluating
pain and function. Tetrax Interactive Balance System was used to assess fall risk and postural
stability. Isokinetic muscle strength measurements of quadriceps and hamstrings were recorded
at the constant angular velocities of 60 and 180°/sec.
Results:
The mean age of the study population was 58.52 ±8.01 years. The frequency of the patellar
situation types was as follows; patella alta; 15 (24.2%), patella baja; n=2(3.2%), and normal
patellar height; n=45(72.6%). The mean ISI was 1.19 ±0.17 on the right side and 1.18±0.16 on the
left side. There was no significant correlation between the ISI and VAS, WOMAC and Lequesne
indexes, postural stability scores, and isokinetic measurements (r<0.3, p>0.05).
Conclusions:
In primary knee OA, the ISI may not have an effect on pain, physical function, fall
risk, postural stability, and isokinetic muscle strength.
Clinical Trial Registration Number: KA18/170.
Publisher
Bentham Science Publishers Ltd.
Subject
Radiology, Nuclear Medicine and imaging
Cited by
4 articles.
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