Questions & Answers · Surgery Center

Is outpatient (same-day) joint replacement safe?

Q: Is outpatient (same-day) joint replacement safe?

For properly selected patients, yes. The AAHKS position statement, updated in 2024 with the Hip Society, Knee Society and AAOS, calls outpatient joint replacement safe and effective for properly selected patients. A review of 41 studies found no difference in complications, readmissions or outcomes versus inpatient surgery, at about $6,800 lower cost. Candidacy depends on medical stability, home support and case complexity; patients with significant heart or lung disease, poorly controlled diabetes (A1c above 6.5), BMI above 40 or no home support are better served in a hospital.

For properly selected patients, yes. The American Association of Hip and Knee Surgeons, with the Hip Society, Knee Society and AAOS, states that outpatient joint replacement is safe and effective for properly selected patients, and the published evidence shows no difference in complications or readmissions compared with a hospital stay. The key phrase is "properly selected": good candidates are medically stable with support at home, and an honest practice screens hard. At Sterling Ridge, serving The Woodlands, Spring and Montgomery County, Dr. Paul Chin, Dr. Brian Flowers and Dr. Rohan Gheewala perform same-day knee and hip replacement at the Sterling Ridge / Woodforest Ambulatory Surgical Center.

What the evidence says

The professional position. The AAHKS position statement, updated in 2024 with the Hip Society, Knee Society and AAOS, calls outpatient joint replacement safe and effective for properly selected patients, with selection based on medical conditions, home support and the complexity of the case.
Outcomes. A systematic review of 41 studies found no difference in complications, readmissions or patient outcomes between outpatient and inpatient hip and knee replacement, with costs roughly $6,800 lower for outpatient (Bemelmans et al., 2022).
Hip-specific numbers. In a pooled analysis of 66,971 patients, complications after outpatient hip replacement were 3.0% versus 4.7% for inpatient, and readmissions 1.4% versus 3.0%. The authors graded this as low-certainty evidence, largely because the healthiest patients are the ones chosen for outpatient surgery, so the comparison isn't apples to apples (Bordoni et al., 2022). Read it as "not worse," not "better."
Medicare agrees. CMS removed total knee replacement from its inpatient-only list in 2018 and total hip replacement in 2020.
The trend. Across 3.7 million registry cases, the average stay after joint replacement fell from 2.9 days in 2012 to 1.1 days in 2023 (AJRR 2024 Annual Report). Same-day discharge is now the mainstream path, not an experiment.

How surgery day actually goes

Arrive in the morning, robotic-assisted replacement, recovery with therapists who get you standing and stepping the same day, home by evening with a clear plan and a next-morning follow-up call. The Sterling Ridge / Woodforest Ambulatory Surgical Center at 750 Fish Creek Thoroughfare in Montgomery was built with Memorial Hermann for exactly this: three operating rooms, one purpose, with rehab and aquatic therapy on the same campus for the weeks after.

Who qualifies, and who shouldn't

Our screening follows the AAHKS statement and the AAOS surgical guideline. Age matters less than health status.

Good candidates: medically stable, motivated, with a capable adult at home the first nights, and a straightforward primary hip or knee replacement.
Blood sugar: the 2023 AAOS guideline update advises a hemoglobin A1c below 6.5 before knee replacement, because poorly controlled diabetes raises infection and wound risk (AAOS, 2023). We apply the same thinking to hips.
Weight: the same guideline notes that a BMI above 40 raises infection risk (AAOS, 2023). That doesn't close the door to surgery, but it usually moves it to a hospital and into a conversation about preparation first.
Opioids: the guideline also advises avoiding opioids before surgery; patients on long-term narcotic pain medicine need a plan before a same-day discharge makes sense.
Better served in a hospital: significant heart or lung disease, sleep apnea that isn't treated, kidney disease, bleeding disorders, no home support, or a complex or revision case. Being told "hospital for you" isn't a downgrade; it's the screening working.
The honest tell: a practice that sends everyone outpatient is selling; one that screens and explains is practicing. Ask how the call gets made. We like that question.

The cost difference is real too. National Medicare averages, facility only: an inpatient hip or knee replacement (DRG 470) carried an average total payment of $17,364 in 2024, while an outpatient hip replacement (CPT 27130) was allowed at $12,476 and an outpatient knee (CPT 27447) at $12,381 (CMS inpatient, CMS outpatient). Surgeon and anesthesia bill separately, and your plan varies; the full money conversation is here.

Why outpatient works here: PT is one door down

Going home the same day is safe when recovery is planned, not improvised, and ours starts in the same building. Before surgery, our rehab team has already met you; after it, your first therapy sessions happen one door from the people who put the joint in. Surgeon, surgery center and physical therapy under one roof means nobody is guessing at your protocol from a faxed note across town.

Who performs outpatient joint replacement at Sterling Ridge

Dr. Paul C. Chin, MD, PhD, FAAOS, FAANA (robotic and partial knee replacement, shoulder replacement), Dr. N. Brian Flowers, MD, MPT, FAAOS (fellowship at the Hospital for Special Surgery; primary hip and knee replacement, anterior-approach hip) and Dr. Rohan A. Gheewala, MD (adult reconstruction fellowship, Baylor College of Medicine; primary, complex and revision hip and knee) all operate at the Sterling Ridge / Woodforest Ambulatory Surgical Center. Sterling Ridge is a high-volume joint replacement practice and one of the leaders in the Houston area. Our surgeons also hold privileges at several area hospitals, so when your insurance plan or your medical history calls for a hospital setting, surgery is scheduled there instead. Consults at The Woodlands, Spring and Woodforest, Monday–Friday 8:00 AM–5:00 PM, no referral needed.

Common questions

Is a surgery center as safe as a hospital for joint replacement?

For properly selected patients, the AAHKS, Hip Society, Knee Society and AAOS position statement calls outpatient joint replacement safe and effective. A review of 41 studies found no difference in complications, readmissions or outcomes compared with inpatient surgery (Bemelmans et al., 2022). The qualifier does the work: a surgery center is the right place for the right patient, and a hospital is the right place for the others.

What if something goes wrong after I go home?

You go home with a written plan, a direct number, and a next-morning check-in. The Sterling Ridge / Woodforest Ambulatory Surgical Center was built with Memorial Hermann, and a hospital transfer pathway exists for the rare case that needs one. In a 66,971-patient analysis, readmission after outpatient hip replacement was 1.4% versus 3.0% for inpatient, with the authors rating the evidence low-certainty (Bordoni et al., 2022).

Does Medicare cover outpatient joint replacement?

Yes. CMS removed total knee replacement from the inpatient-only list in 2018 and total hip replacement in 2020. Commercial plans vary in which setting they approve; our team verifies your benefits before anything is scheduled. The money side is on Cost & Insurance.

Who decides whether I'm an outpatient candidate?

Your surgeon, with the anesthesia team and your medical history in front of them. Dr. Chin, Dr. Flowers and Dr. Gheewala all operate at the surgery center and all send patients to the hospital when the screening says so. Being told "hospital for you" is the system working, not a downgrade.

Sources

Medically reviewed by Keith W.V. Johnson, MD, FAAOS · Updated October 20, 2026