Bladder Changes After Knee Surgery: Indirect Effects Explained
Knee surgery does not directly affect bladder anatomy or innervation. However, perioperative factors can transiently alter voiding:
- Anesthesia: Spinal/epidural → temporary urinary retention (resolve in 12–24 hrs). General anesthesia → delayed return of bladder sensation.
- Opioid Analgesia: Increases sphincter tone, decreases detrusor contractility → retention.
- Immobility & Dehydration: Reduced bladder filling, concentrated urine.
- Anticholinergic Adjuncts (e.g., scopolamine for PONV): Further reduce bladder tone.
- Pre-existing Conditions: BPH, neurogenic bladder, medications unmasked by stress.
Management
- Monitor voiding; straight cath if >6 hrs post-spinal or palpable bladder.
- Minimize opioids; use multimodal analgesia.
- Early mobilization; adequate hydration.
- Review home medications for anticholinergic burden.
Persistent symptoms (>72 hrs) warrant urology consult.
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