Urinary retention after hip or knee replacement

Postoperative urinary retention means the bladder is filling but cannot empty normally. It may be obvious because no urine passes, or less obvious because only small amounts come out while a larger volume remains. Early symptoms can include pressure or fullness low in the abdomen, repeated urges, frequent small voids, straining, a weak stream, dribbling, restlessness, or worsening discomfort.

Do not wait until the bladder is severely painful. Tell the nurse before discharge, or call the surgical team if symptoms begin at home. A prospective study of patients undergoing primary knee replacement found that postoperative urinary retention can delay discharge and may cause urologic harm when not recognized. Review the PubMed study.

Normal urination requires bladder sensation, bladder-muscle contraction, an open outlet, privacy, positioning, and enough mobility to reach or use a toilet. Surgery can temporarily disrupt several of those pieces. Spinal or general anesthesia may reduce bladder sensation or contraction. Opioids and other medicines can interfere with awareness or emptying. IV fluid may fill the bladder before the urge returns, while pain, immobility, or an unfamiliar setting can make it difficult to relax.

Retention has been studied after both hip and knee arthroplasty. Research in fast-track joint replacement has identified anesthetic technique and patient factors as relevant, but risk varies across procedures and protocols. See the hip-and-knee arthroplasty study.

Tell the surgical and anesthesia teams before surgery if you have had urinary retention after a prior procedure, an enlarged prostate, a weak stream, difficulty starting, incomplete emptying, frequent nighttime urination, prior bladder or prostate surgery, a neurologic condition affecting the bladder, recurrent urinary infection, kidney disease, or regular catheter use. Bring a complete medicine list, including over-the-counter sleep aids and allergy medicines.

Older age, male sex, pre-existing outlet symptoms, certain anesthetic and pain-control techniques, higher bladder volumes, and some medicines have been associated with retention in published studies. These are risk markers, not a prediction that retention will occur. The most useful step is advance planning so the team knows your baseline and can monitor appropriately.

A person can urinate a small amount and still have a substantial residual volume in the bladder. Clues include returning to the toilet repeatedly, producing only small volumes, ongoing pressure after urinating, a slow or interrupted stream, and leaking or dribbling. Sedation may blunt discomfort, so symptoms alone are not always reliable.

The care team may compare fluid intake with urine output and use a portable bladder ultrasound, often called a bladder scan, to estimate how much urine remains. This is noninvasive and helps guide decisions without relying on guesswork. A result must be interpreted with symptoms, timing, kidney function, fluid balance, and the facility's protocol.

Discharge criteria differ by facility and patient. The team may ask when you last urinated, measure the amount, check for bladder fullness, or perform a bladder scan. If the bladder is filling but not emptying, they may allow more recovery time, review medicines and fluids, help with safe toileting, repeat the scan, or drain the bladder when clinically necessary.

This is one reason a planned same-day procedure sometimes becomes an overnight stay. The JRH same-day knee replacement discharge guide explains why waiting can be the safest outcome. A delayed discharge for bladder monitoring is not a failed replacement; it is a response to the patient's condition that day.

If the bladder becomes too full or symptoms are significant, the team may pass a thin tube through the urethra to drain urine. Some patients need a single intermittent catheterization followed by another attempt to urinate. Others may temporarily leave a catheter in place or require follow-up, depending on the volume retained, recurrence, baseline urinary health, and local protocol.

MedlinePlus describes urinary catheters as devices used to drain the bladder when urinary retention prevents normal emptying. Read the MedlinePlus catheter overview. Do not insert, remove, clamp, or irrigate a catheter unless a trained clinician has specifically taught and authorized you to do so.

Catheters can relieve overdistension, measure output, and protect the bladder when retention is present. They also can cause discomfort, urethral trauma, or infection, so clinicians balance the benefit against those risks. AHRQ guidance recommends limiting postoperative catheter use to appropriate indications and removing surgical catheters promptly when continued use is not needed. Review the AHRQ guidance.

If you go home with a catheter, use the written care plan. Keep the drainage system positioned as instructed, avoid pulling or kinking the tubing, wash your hands before and after handling it, and know who will remove it or conduct the next voiding trial.

Opioids can slow the bowel and may contribute to bladder difficulty. Sedatives, some antihistamines, and medicines with anticholinergic effects can also worsen retention in susceptible patients. Do not stop prescription medicines or change doses on your own. Call the surgical, medical, or prescribing team for a medication review.

Constipation can add pressure and make emptying more difficult. Follow the bowel regimen in your discharge instructions, especially while taking opioids. The JRH constipation guide covers prevention, medication cautions, and obstruction warning signs. Avoid taking extra laxatives or urinary medicines without guidance, particularly if you have kidney disease, low blood pressure, or other medical conditions.

Use the contact instructions supplied at discharge. Record when you last urinated, approximate amount if known, fluid intake, symptoms, and medicines taken. Contact the surgical team promptly for a new weak stream, repeated small voids, increasing lower-abdominal pressure, leaking with a sense of fullness, or a clear decrease in urine output.

Do not force excessive water in an attempt to “push” urine through. That can worsen bladder overfilling and may be unsafe for people with heart or kidney disease or a fluid restriction. Do not delay evaluation by repeatedly trying home remedies. If the team advises in-person assessment, arrange safe transportation and do not drive while taking sedating pain medicine.

Seek urgent same-day evaluation for inability to urinate with increasing lower-abdominal pressure, pain, or visible distension; repeated small voids with worsening fullness; new blood in the urine; vomiting; fever or chills; new confusion; or catheter blockage with no drainage and discomfort. Severe pain, marked weakness, fainting, trouble breathing, or rapidly worsening illness warrants emergency care.

Acute retention is relieved by draining the bladder and assessing the cause. Waiting for the next routine appointment can allow overdistension and complications. AHRQ's patient-safety review notes the importance of recognizing postoperative retention and pre-existing outlet problems. Read the AHRQ PSNet review.

A catheter and incomplete bladder emptying can increase urinary infection risk. Report burning with urination, cloudy or foul-smelling urine together with symptoms, lower-abdominal pain, fever, chills, flank or back pain, or new confusion. Urine appearance alone is not enough to diagnose an infection, and antibiotics should not be started from leftover medication.

MedlinePlus lists fever, chills, flank pain, lower-abdominal pressure, abnormal urine, and mental-status changes among possible catheter-related urinary infection symptoms. Review the MedlinePlus guidance. A clinician may need a urine sample and examination before deciding on treatment.

Before joint replacement, tell the team about difficulty urinating, prior retention, prostate treatment, bladder medicines, recurrent infection, or catheter use. Ask how the facility monitors bladder function and what happens if you cannot urinate before discharge. Patients with significant baseline symptoms may need evaluation or a tailored plan before the operation.

Bring an accurate medication list and do not take an extra dose of a prostate or bladder medicine to prevent retention unless the prescribing clinician directs it. The goal is not to guarantee that retention cannot happen; it is to recognize risk, avoid preventable contributors, and respond early.

When contacting the team, be ready to report:

Before leaving a surgery center or returning to a neighbor island, confirm the bladder plan, after-hours number, and nearest place able to assess acute retention. Do not board a flight or begin a long drive with increasing bladder pressure or unresolved inability to urinate. Travel can make timely assessment harder and may separate you from the operative team.

If a catheter is required for travel, ask for written care instructions, supplies, a removal or voiding-trial appointment, and a backup plan for blockage, fever, pain, or no drainage. Carry the medication list and procedure information with you.

Many cases improve as anesthesia wears off, mobility returns, constipation is treated, and medicines are adjusted. The right response is early assessment—not embarrassment, forced fluids, or waiting through severe pressure. Prompt recognition helps protect the bladder and keeps the recovery plan moving safely.

If you are preparing for hip or knee replacement and have a history of urinary problems, schedule an orthopedic consultation and bring your medication list and prior urology history so the perioperative plan can be coordinated.

• Postoperative urinary retention after primary total knee arthroplasty
• Urinary retention after hip or knee arthroplasty under spinal anesthesia with intrathecal morphine
• AHRQ PSNet: Urinary Retention Dilemma
• AHRQ: Appropriate catheter use and alternatives
• MedlinePlus: Urinary catheters
• MedlinePlus: Catheter-related urinary tract infection