Pudendal Nerve Injury and Sensory Dysfunction
Yes, chronic pudendal nerve stretch-traction injury directly causes both the blunted urge to void and reduced sexual sensation through damage to the somatic sensory pathways that convey bladder filling awareness and genital sensation. 1, 2
Mechanism of Sensory Loss
Pudendal nerve damage impairs the somatic afferent (sensory) pathway that normally transmits bladder fullness signals and genital sensations to the central nervous system, resulting in diminished awareness of bladder filling and dulled sexual sensation 1, 2
The pudendal nerve is the main nerve of sexuality and perineal sensation, carrying sensory information from the external genitalia, perineum, and distal urethra—when injured by stretching or compression, these sensory functions are directly compromised 2, 3
Stretch-traction injuries occur when excessive mechanical force is applied to the pudendal nerve, causing axonal damage that disrupts both sensory and motor function in the distribution of the nerve 4, 3
Clinical Presentation of Pudendal Neuropathy
Voiding symptoms are commonly exhibited in patients with pudendal nerve entrapment (PNE), including both urgency and impaired sensation of bladder filling 1
Disorders of perineal sensitivity are the hallmark urological consequence of pudendal nerve trauma, often accompanied by vesicosphincteric dysfunction 3
Sexual dysfunction manifests as erectile dysfunction in men and vulvodynia or persistent genital arousal disorder in women, all directly attributable to pudendal nerve damage 2
The most prevalent site of entrapment is at the level of Alcock's canal, though compression can occur at four primary anatomical locations along the nerve's course 1
Diagnostic Approach
Electrophysiological studies of the perineum, particularly measurements of distal pudendal nerve motor latencies, establish the diagnosis and identify the level of neurological lesion 4, 3
The Nantes criteria should be applied for differential diagnosis of pudendal neuralgia versus other causes of pelvic pain and sensory dysfunction 5
Electrophysiological testing is reserved for serious lesions and helps determine prognosis—the severity of symptoms and electrophysiological findings predict recovery potential 3
Treatment and Prognosis
Pudendal nerve neurolysis (PNN) improves both urgency and voiding symptoms, as well as sexual function, by relieving nerve compression and allowing recovery of the somatic afferent pathway 1
Recovery of erectile function occurs early after neurolysis when the somatic sensory pathway is restored, and complete relief of persistent genital arousal disorder occurs in women (though bilateral PNN is necessary for full efficacy) 1
PNN is less effective in cases of long-standing entrapment, emphasizing the importance of early diagnosis and intervention before irreversible axonal damage occurs 1
Disorders of perineal sensitivity usually resolve spontaneously when mild, but vesicosphincteric and erectile disorders have a more pejorative course and can sometimes persist 3
Surgical decompression is rarely indicated but can be necessary for serious and persistent sensory or motor lesions that fail conservative management 3
Critical Clinical Pitfall
Do not attribute blunted bladder sensation and reduced genital sensation to primary bladder dysfunction (such as diabetic cystopathy or detrusor overactivity) without first excluding pudendal nerve injury, especially in patients with a history of pelvic trauma, pelvic surgery, or prolonged positioning on orthopedic tables 4, 3, 5
Pudendal neuralgia is an underdiagnosed yet reversible cause of multiple sexual dysfunctions and voiding symptoms—physicians should examine the pudendal canal before concluding an idiopathic cause 2