Alterations in lower-extremity sagittal plane joint moments due to experimental knee pain and effusion during walking
© Park et al; licensee BioMed Central Ltd. 2014
Published: 8 April 2014
To examine acute alterations in lower-extremity sagittal plane joint moments due to isolated and/or combined experimental knee joint pain and effusion during walking.
Nineteen able-bodied subjects walked four different conditions (control, effusion, pain, and pain+effusion), with a week between each condition. We used previously-used injury models of pain  and joint effusion  to the right side of the knee. The control condition consisted of no injection. For each condition, subjects completed three walking trials at three times: precondition (prior to injection(s)), condition (3 minutes post injection(s)), and postcondition (30 minutes post injections). We used a standard inverse dynamics approach (combining high speed video, ground reaction force, and anthropometric data) to estimate sagittal-plane, net, internal, joint moment for the hip, knee, and ankle during walking. A functional analysis of variance (FANOVA) approach was used to compare the aforementioned joint moment between conditions. This statistical approach allowed us to evaluate when differences exist, across the entire stance phase of gait, as well as the magnitude of the detected differences.
Stimulation of the receptors specific to joint pressure appears to cause higher impact on alterations in sagittal plane joint moment compared to the nociceptor stimulation. Simultaneous knee joint pain and effusion produced a summative effect on sagittal plane joint moments. Since knee joint effusion and pain are common symptoms in knee joint injuries, both variables should be controlled in acute and chronic phase of rehabilitation in order to avoid altered joint moments.
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