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Knee joint effusion can lead to a decline in quadriceps strength and activation. This is due to ongoing neural inhibition that prevents the central nervous system from fully activating the quadriceps, a process known as arthrogenic muscle inhibition (AMI). AMI is a marked weakness of the quadriceps muscles that is typically observed following injury, surgery or pathology affecting the knee joint.
| Characteristics | Values |
|---|---|
| Weakness of muscles | Marked weakness of the quadriceps muscles is typically observed following injury, surgery or pathology affecting the knee joint |
| Neural inhibition | Ongoing neural inhibition prevents the central nervous system from fully activating the quadriceps |
| Process | Arthrogenic muscle inhibition (AMI) |
| Study method | Transcranial magnetic stimulation was used to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion |
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What You'll Learn
Neural inhibition
AMI is observed following injury, surgery or pathology affecting the knee joint. It is characterised by marked weakness of the quadriceps muscles.
One study used experimental knee pain and effusion models to examine the effects on quadriceps muscle strength and activation. Both the effused knee and painful knee groups demonstrated quadriceps muscle dysfunction, but the amounts of quadriceps activation and strength deficits were not magnified when these two stimuli were present simultaneously.
Another study used transcranial magnetic stimulation to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion. The results showed that effusion leads to quadriceps inhibition during a quadriceps contraction.
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Arthrogenic muscle inhibition (AMI)
AMI is characterised by marked weakness of the quadriceps muscles. This weakness can be observed following injury, surgery or pathology affecting the knee joint. Experimental knee joint effusion has been found to cause declines in quadriceps strength and activation.
To investigate the mechanisms underlying AMI, studies have been conducted to explore the effects of experimental knee joint effusion on quadriceps corticomotor and intracortical excitability. One such study used transcranial magnetic stimulation to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion.
The results of this study showed that knee joint effusion led to declines in quadriceps strength and activation, which is consistent with previous investigations that have noted the link between effusion and AMI. However, the study also found that the presence of pain did not magnify the deficits in quadriceps activation and strength caused by effusion. This suggests that quadriceps inhibition can occur independently of perceived pain.
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Quadriceps corticomotor excitability
AMI is a process that prevents the central nervous system from fully activating the quadriceps. It is caused by ongoing neural inhibition, which is a marked weakness of the quadriceps muscles that is typically observed following injury, surgery or pathology affecting the knee joint.
Transcranial magnetic stimulation is used to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion. This process was carried out on 17 healthy volunteers.
The results of the study showed that knee joint effusion led to declines in quadriceps strength and activation. This was not a novel result, as many investigators have noted that effusion leads to AMI. However, the study did find that effusion leads to quadriceps inhibition during a quadriceps contraction, which is worth highlighting.
The study also found that the presence of pain does not necessarily result in quadriceps dysfunction. Shakespeare noted that quadriceps inhibition can occur in the absence of perceived pain in patients after meniscectomy, while Arvidsson et al found that reducing pain via epidural injections of lidocaine can increase quadriceps electromyographic activity in patients after ACL reconstruction.
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Intracortical facilitation
Effusion can cause muscle inhibition, which is a process known as arthrogenic muscle inhibition (AMI). This is caused by neural inhibition, which prevents the central nervous system from fully activating the quadriceps.
The study on intracortical facilitation involved 17 healthy volunteers. The transcranial magnetic stimulation was used to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion.
The results of the study showed that effusion led to declines in quadriceps strength and activation. This was not a novel result, as many previous investigations had noted that effusion leads to AMI. However, the study used a different method to quantify AMI, using the CAR rather than the H reflex. This method was recorded while volunteers performed muscle contraction, providing a more dynamic measurement of AMI.
The study also found that the presence of pain did not necessarily result in quadriceps dysfunction. This suggests that other factors, such as effusion, may play a more significant role in quadriceps inhibition.
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Experimental knee joint effusion
The study of experimental knee joint effusion can help to further investigate the mechanisms underlying AMI, which is a process that prevents the central nervous system from fully activating the quadriceps. AMI, or arthrogenic muscle inhibition, is a common occurrence following injury, surgery or pathology affecting the knee joint. It results in marked weakness of the quadriceps muscles.
The study of experimental knee joint effusion can help to better understand the effects of effusion on muscle function and inform strategies for managing and treating quadriceps muscle dysfunction.
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Frequently asked questions
Effusion is the presence of an abnormal amount of fluid in a body cavity.
Effusion can lead to a decline in muscle strength and activation. This is due to ongoing neural inhibition that prevents the central nervous system from fully activating the muscles.
AMI is a process where the central nervous system is prevented from fully activating the quadriceps muscles due to ongoing neural inhibition.
Effusion can lead to marked weakness of the quadriceps muscles. This is often observed following injury, surgery or pathology affecting the knee joint.
Transcranial magnetic stimulation can be used to measure quadriceps motor evoked potential area, short-interval intracortical inhibition, intracortical facilitation and cortical silent period duration before and after experimental knee joint effusion.
