Mechanical Allodynia
Mechanical Allodynia - Related Videos
07:44
The Spared Nerve Injury (SNI) Model of Induced Mechanical Allodynia in Mice
0 Views •
Cited by 97 •
2011
The Spared Nerve Injury animal model is described here as a mouse model of peripheral neuropathic pain following partial denervation of the sciatic nerve by lesioning the tibial and common peroneal nerve branches, leaving the remaining sural nerve intact. Behavioral modification resulting from mechanical allodynia is quantified by von Frey filaments.
06:46
Measurement of Tactile Allodynia in a Murine Model of Bacterial Prostatitis
0 Views •
Cited by 23 •
2013
Infection of the prostate may be a contributing factor in mediating pelvic pain in chronic prostatitis. We describe the procedure for preparation of standardized bacterial inoculum, instillation of bacteria into the urethra of male mice and methodology for measuring tactile allodynia in mice over time.
06:44
Demonstration of Cutaneous Allodynia in Association with Chronic Pelvic Pain
0 Views •
Cited by 22 •
2009
A demonstration of the bedside test for cutaneous allodynia and its clinical implications.
12:45
Mechanical Stimulation of Chondrocyte-agarose Hydrogels
0 Views •
Cited by 29 •
2012
The biosynthesis of cartilaginous extracellular matrix by chondrocytes can be affected by application of mechanical stimuli. This method describes the technique of applying dynamic compressive strains to chondrocytes encapsulated in 3D constructs and the evaluation of induced changes in chondrocyte metabolism.
03:06
Reaction Mechanisms
0 Views •
2020
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. For instance, the decomposition of ozone appears to follow a mechanism with two steps:
FAQs
Peripheral nerve injury or inflammation can increase the sensitivity of nociceptors, the sensory receptors that detect potentially damaging stimuli. This heightened peripheral responsiveness makes incoming mechanical signals more likely to engage pain-related processing. In clinical medicine, recognizing this peripheral contribution helps place the symptom within a broader neuropathic pain mechanism rather than treating it as an isolated sensory complaint.
Central sensitization occurs when spinal neurons become excessively responsive to incoming sensory information. As a result, signals that would ordinarily remain nonpainful can activate pain pathways more readily. This spinal amplification explains why mechanical allodynia may persist or appear disproportionate to the applied stimulus, and it provides an important mechanism for understanding altered sensory processing in chronic pain disorders.
Low-threshold mechanoreceptors normally convey information from gentle mechanical contact, including light touch or brushing. With altered spinal processing, their input can gain access to pain pathways instead of remaining a nonpainful tactile signal. This change links ordinary touch sensations to the clinical experience of pain and illustrates how sensory pathway integration can shift during neuropathic conditions.
Mechanical allodynia can occur in conditions that disturb peripheral nerves or pain processing, including peripheral neuropathy and postherpetic neuralgia. It may also appear in other chronic pain disorders. Its presence does not describe only the stimulus itself; it provides evidence that sensory signaling has become abnormal, helping clinicians characterize the pain pattern and consider an appropriate diagnostic context.
Clinicians assess the response using controlled mechanical stimulation, such as light touch, brushing, or gentle pressure. They observe whether these ordinarily nonpainful inputs provoke pain and characterize the response as part of the patient’s sensory examination. Repeating the assessment over time can help monitor changes in abnormal pain processing and support evaluation of clinical progression or response to care.
The finding helps clinicians identify altered sensory processing within a patient’s pain presentation and distinguish neuropathic features from ordinary tactile sensation. In peripheral neuropathy, postherpetic neuralgia, and related chronic pain disorders, documenting its presence can contribute to clinical characterization. Tracking the response during follow-up also supplies a practical measure for assessing whether the sensory abnormality changes over time.