Home in 24 hours: preparing for a hip or knee replacement discharge

How long will the hospital stay actually be?

Much shorter than most published advice assumes, and shorter than it was even a few years ago. According to the American Joint Replacement Registry's 2024 annual report, the mean hospital stay in 2023 was 1.1 days for elective primary total hip replacement and 1.1 days for primary total knee replacement, the latter down from 2.9 days in 2012. Partial knee replacement averaged 0.5 days.

The American Academy of Orthopaedic Surgeons describes the range plainly on its patient pages: you will either be admitted to the hospital on the day of your surgery, or you will go home the same day. If you are admitted, AAOS says you will most likely stay overnight and, in some cases, longer.

Discharge destination has shifted just as sharply. In 2023, roughly 93% of knee replacement patients and 92% of hip replacement patients went directly home rather than to a facility, compared with 85% and 87.5% respectively in 2017. Discharge to a skilled nursing facility now represents under 5% of knee replacement discharges.

Why did joint replacement discharge get so much faster?

Because of changes to surgical technique, anesthesia, pain management and early mobilization protocols, accumulated over roughly a decade, and because Medicare stopped requiring these procedures to be done as inpatient stays. Total knee replacement was removed from Medicare's inpatient-only list effective CY 2018, and total hip replacement effective CY 2020.

It is worth correcting a claim that circulates about this, because it sounds plausible and is not true. CMS is currently phasing out the inpatient-only list more broadly, removing 285 services in the CY 2026 rule. That phase-out has nothing to do with hip and knee replacement timing, because hips and knees came off the list years earlier and are not among those 285 services. If you see the current phase-out described as the reason people now go home in 24 hours, that is a misattribution.

Removal from the inpatient-only list also does not force anything. CMS states directly that removal of procedures from the list does not require the procedures to be performed only on an outpatient basis; it allows payment in either setting. Whether a specific patient stays overnight remains a clinical judgment made by the surgical team.

What should be set up at home before the operation?

Nearly all of this has to happen before the surgery date, because afterward the person who would normally do it is the one recovering. AAOS publishes a specific home-preparation list, and its practical core is about clearing the path and getting the seating right.

• Remove throw rugs and clear the walking paths through every room you will use. Fasten electrical cords around the perimeter of the room rather than across the floor.
• Try the walker before surgery. AAOS suggests borrowing a walker, cane or crutches beforehand specifically to see how well you can maneuver through your own home, which surfaces doorway and turning problems while there is still time to fix them.
• Set up a proper chair. For knee replacement, AAOS specifies a firm chair roughly 18 to 20 inches high with arms. For hip replacement the specification is deliberately different: a firm seat cushion that allows your knees to remain lower than your hips, a firm back, and two arms, with no height given, because for hips the governing variable is hip angle rather than seat height. Do not blend the two.
• Arrange the bathroom with the equipment your surgical team recommends, which commonly includes a raised toilet seat and a shower or tub bench.
• Move daily items to waist height so nothing needed routinely requires bending or reaching up.
• Stock the kitchen in advance, including some foods high in fiber, and prepare meals that can be reheated easily.
• Sort out footwear. One hospital's published patient booklet is specific about this: no flip-flops, no slip-ons, no heels. Supportive closed shoes only.

Which symptoms after discharge need a call?

AAOS publishes three distinct symptom clusters on its patient pages for hip and knee replacement. Its instruction for all of them is to notify your doctor immediately. That phrasing is AAOS's own and is worth preserving exactly, rather than being upgraded or softened.

How long do hip precautions last?

Longer than the six weeks commonly quoted. AAOS's actual guidance is not to cross your legs at the knees for at least 6 to 8 weeks, and it says most patients should be able to resume most of the "don'ts" after 6 to 8 weeks. If you have seen a flat six-week figure, it is an under-statement of what AAOS publishes.

AAOS also states something immediately above its precautions list that belongs alongside any version of it: not all surgeons recommend the same precautions, and both the precautions themselves and their duration vary depending on the surgical technique used. A list found online is a general reference. Your surgeon's list is the one that applies.

One more thing about that list. AAOS leads its "don'ts" with an item that is frequently dropped when the list gets summarized elsewhere: don't fall. Its guidance adds that if you feel unsteady or have other risk factors for falls, such as taking medications that cause dizziness, you should talk to your doctor. On a page about coming home safely, that is arguably the most important item of all, and it is the one most often omitted.

On dislocation, AAOS notes the risk is greatest in the first few months after surgery while the tissues are healing, describes dislocation as uncommon, and notes that where it does occur a closed reduction can usually put the joint back into place without further surgery.

What if going straight home is not realistic?

This is where families most often get an unwelcome surprise, and the rule is more specific than it first appears. Under Original Medicare, a prior 3-day inpatient hospital stay remains a statutory requirement for skilled nursing facility coverage. Since a modern joint replacement commonly involves a stay of one day or less, a routine hip or knee replacement will not by itself satisfy that requirement.

Two qualifications matter enormously here, and both cut in the patient's favor or against it depending on the situation:

• The three days must be inpatient days. Time spent in the hospital under observation or outpatient status does not count toward the requirement, even though it may feel identical from a hospital bed. This is the trap families actually fall into, and it is worth asking directly what status a patient is in.
• Medicare Advantage plans frequently waive the 3-day rule, as do certain accountable care and payment-model arrangements. Roughly half of Medicare beneficiaries are in Medicare Advantage plans. If that applies, the Original Medicare rule above may simply not govern, and the plan should be asked directly.

The practical takeaway is to ask before surgery rather than at discharge: what is the expected length of stay, what inpatient status is anticipated, and if a facility stay turns out to be needed, what would actually be covered under this specific insurance.