How do I sleep after knee replacement?

Reviewed by Erin Rose — healthcare price-transparency analyst. Last checked July 27, 2026.

How should I position my leg while I sleep?

University of New Mexico Health's Department of Orthopaedics & Rehabilitation publishes discharge instructions for total knee replacement that say, under "Sitting and Sleeping":

"Sleep with a pillow under your ankle, not your knee. Be sure to change the position of your leg during the night."

Allina Health's total knee replacement materials give the same placement, in different words: "Raise (elevate) your leg above the level of your heart by placing a pillow under your calf or ankle, not your knee." Two hospital systems, same instruction. Your own discharge sheet overrides anything on this page — if it says something different, follow it.

Do I need to elevate my leg while sleeping?

Keeping the leg elevated above heart level helps with the swelling that follows this surgery. Most people do this with pillows or a wedge rather than any dedicated medical device — there's no HCPCS code for "leg elevation," so there's nothing to check for coverage beyond what's already in the fact box above.

What do people actually use — a wedge pillow, a body pillow, or both?

Recovery-forum posters describe using both, for different reasons: a wedge under or against the leg for elevation, and a body pillow (or "long king-size" pillow) to brace against when turning over.

"You might want to consider a body pillow for sleeping a bit more comfortably as it gives you something to lean against... and helps when the first side sleeping is allowed."

That quote and the ones below come from a general hip-and-knee recovery corpus that turned out mostly hip-replacement (THR) threads, not knee-specific ones — used only as color on how people describe positioning, not as clinical fact.

What does each one cost, and is either covered?

Neither is covered — see the fact box above. Ballpark retail cost (rounded estimates, not yet verified against live listings):

• Wedge pillow / leg-elevation cushion — $20-$45. Keeping the leg elevated while resting helps with the swelling that follows this surgery. No HCPCS code; not billed as DME. See /gear/wedge-pillows/ for verified picks once that page publishes.
• Body pillow / positioning pillow — $20-$40. Something to brace against helps with turning over in bed and finding a comfortable side position without twisting the operated leg. No HCPCS code; not billed as DME.

What about the hospital bed or bed rail — are those different?

Yes. Unlike the two pillows above, a hospital bed and a supplier-billed bed rail are real, billable HCPCS codes with Medicare fees attached — though most people recovering from knee replacement don't need either one:

• Hospital bed (only if stairs are a problem) (E0260) — If your usual bedroom is up a flight of stairs you can't manage the first week, a temporary bed on the main floor solves that -- most people don't need this. Medicare's fee range for E0260 (semi-electric, head/foot adjustment) is $72.80-$128.14; 758,660 billed nationally in DY2024, by far the highest-volume hospital-bed code.
• Portable bed rail — A rail to push against makes rolling over and getting up from bed easier -- but this is one of the few items worth checking before you accept a hand-me-down. CPSC recalled 39 adult portable bed rails, with deaths mentioned in 6 of those recalls (13 deaths total, entrapment/asphyxiation) -- source: data/recalls.json, CPSC SaferProducts.gov. Check any secondhand or borrowed rail's brand and model against CPSC's recall list before use (16 CFR Part 1270 is the federal safety standard these units must meet). Medicare separately covers a supplier-billed rail with a doctor's order (E0305/E0310) if you go that route instead of borrowing.