Author/Authors :
Jalali، Maryam نويسنده Regional Knowledge Hub for HIV/AIDS Surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran , , Farahmand، Farzam نويسنده , , Mousavi، Seyed Mohammad Ebrahim نويسنده Department of Orthotics and Prosthetics, University of
Social Welfare and Rehabilitation Sciences, Tehran,
Iran , , Golestanha، Seyed Ali نويسنده Department of Radiology, Mostafa Khomeini Hospital, Shahed
University, Tehran, Iran , , Rezaeian، Tahmineh نويسنده University of Leeds, Leeds, UK , , Shirvani Broujeni، Shahram نويسنده Sports Medicine Federation, Tehran, Iran , , Rahgozar، Mehdi نويسنده Department of Statistical, Faculty of Statistical and Computer, Welfare & Rehabilitation Sciences University, Tehran, Iran Rahgozar, Mehdi , Esfandiarpour، Fateme نويسنده Department of Physical Therapy, Ahvaz Jundishapur
University of Medical Sciences, Ahvaz, Iran ,
Abstract :
Despite several studies with different methods, the effect of
functional knee braces on knee joint kinematics is not clear. Direct
visualization of joint components through medical imaging modalities may
provide the clinicians with more useful information. In this study, for
the first time in the literature, video fluoroscopy was used to
investigate the effect of knee bracing on the sagittal plane kinematics
of anterior cruciate ligament (ACL) injured patients. For twelve male
unilateral ACL deficient subjects, the anterior tibial translation was
measured during lunge exercise in non-braced and braced conditions.
Fluoroscopic images were acquired from the subjects using a digital
fluoroscopy system with a rate of 10 fps. The image of each frame was
scaled using a calibration coin and analyzed in AutoCAD environment. The
angle between the two lines, tangent to the posterior cortexes of the
femoral and tibial shafts was measured as the flexion angle. For the
fluoroscopic images associated with 0°, 15°, 30°, 45° and 60° knee
flexion angles, the relative anterior-posterior configuration of the
tibiofemoral joint was assessed by measuring the position of landmarks
on the tibia and femur. Results indicated that the overall anterior
translations of the tibia during the eccentric (down) and concentric
(up) phases of lunge exercise were 10.4 ± 1.7 mm and 9.0 ± 2.2 mm for
non-braced, and 10.1 ± 3.4 mm and 7.4 ± 2.5 mm, for braced conditions,
respectively. The difference of the tibial anterior-posterior
translation behaviors of the braced and non-braced knees was not
statistically significant. Fluoroscopic imaging provides an effective
tool to measure the dynamic behavior of the knee joint in the sagittal
plane and within the limitations of this study, the pure mechanical
stabilizing effect of functional knee bracing is not sufficient to
control the anterior tibial translation of the ACL deficient patients
during lunge exercise.
