Abstract
PurposeTo investigate neuromuscular electromyographic response of the of the upper and lower leg muscles after the application of an intraoperative, isolated mechanical stimulus of the capsuloligamentous structures, including the anterior (ACL) and posterior cruciate ligaments (PCL), lateral (LM) and medial menisci (MM), plica mediopatellaris (PM), and Hoffa’s fat pat (HFP).MethodsThe electromyographic response of the upper and lower leg muscles (M. rectus femoris; M. vastus medialis; M. semitendinosus; M. biceps femoris; M. gastrocnemius lateralis) of 15 male patients were measured after an isolated mechanical stimulus of the capsuloligamentous structures during an arthroscopic intervention using a customized intraoperative setup. Target parameters were the short (SLR; <30 milliseconds) and medium latency responses (MLR; >30 milliseconds) after the mechanically-induced trigger.ResultsThe ACL, PCL, LM, and MM displayed high interindividual reproducibility of >76%. The MM was the only structure indicating both an SLR and MLR for all muscles. Although signals could be detected, there was no reproducibility in electromyographic signal activation for the HFP. The most rapid MLR was observed for the PM (quadriceps: 37 milliseconds).ConclusionsEach stimulated structure displayed an individual MLR response, which allowed us to create neuromapping combining the anatomical and quantitative representations of the individual muscular activation patterns after isolated mechanical stimulation of the capsuloligamentous knee joint structures, corroborating our hypothesis.Level of EvidenceDiagnostic - Level II.
Highlights
To investigate neuromuscular electromyographic response of the of the upper and lower leg muscles after the application of an intraoperative, isolated mechanical stimulus of the capsuloligamentous structures, including the anterior (ACL) and posterior cruciate ligaments (PCL), lateral (LM) and medial menisci (MM), plica mediopatellaris (PM), and Hoffa’s fat pat (HFP)
University, no. 91/11) and the patients’ written informed consent, the ACL, PCL, lateral meniscus (LM) and MM, PM, and HFP of 17 male patients (Table 1) with no history of neurologic disorders were investigated during different arthroscopic interventions
A commercially available arthroscopic hook probe (Richard Wolf GmbH, Knittlingen, Germany) with a modified rounded tip that was directly connected to an impactor allowed for the application of isolated subcritical stimuli of 15-N tensile force to the PM and HCP and 40 N to the ACL, PCL, LM, and MM (Fig 2)
Summary
To investigate neuromuscular electromyographic response of the of the upper and lower leg muscles after the application of an intraoperative, isolated mechanical stimulus of the capsuloligamentous structures, including the anterior (ACL) and posterior cruciate ligaments (PCL), lateral (LM) and medial menisci (MM), plica mediopatellaris (PM), and Hoffa’s fat pat (HFP). Conclusions: Each stimulated structure displayed an individual MLR response, which allowed us to create neuromapping combining the anatomical and quantitative representations of the individual muscular activation patterns after isolated mechanical stimulation of the capsuloligamentous knee joint structures, corroborating our hypothesis. The hereby damaged mechanoreceptors lose their function to adequately provide an afferent stimulus Loss of this reflex leads, by a loss of muscle coordination, to a loss of protective joint function.
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