The single most important factor in your sleep setup after hip replacement is bed height. The top of your mattress should sit 55 to 65 cm from the floor so that when you sit on the edge, your knee falls below your hip. A bed that is too low forces your hip into dangerous flexion beyond 90 degrees with every transfer.
This article provides general information only and does not replace professional medical guidance. Always follow the specific instructions given by your surgeon, physiotherapist, and hospital discharge team. Hip surgery precautions vary significantly by surgical approach, implant type, and individual patient factors. When in doubt, contact your surgical team before making changes to your sleep setup.
Hip replacement is one of the most commonly performed elective orthopaedic surgeries in Canada, with more than 60,000 procedures completed annually. Recovery goes well for the vast majority of patients, but the early weeks require careful attention to how you move, sit, and sleep. At Mattress Miracle in Brantford, our sleep specialist Dorothy regularly speaks with patients and their family members who are preparing a recovery setup at home. The questions she hears most often are about bed height, mattress firmness, and whether an adjustable base is worth considering.
This guide covers the practical sleep setup questions that come up in those conversations. It is not a substitute for your surgeon's discharge instructions, but it will help you understand what to ask and why certain details matter.
Hip Replacement Precautions and Dislocation Risk
The precautions that apply after hip replacement depend primarily on the surgical approach your surgeon used. This is the most important thing to understand before planning your sleep setup.
Posterior approach (traditional): The joint capsule and external rotator muscles are cut to access the hip from behind. Dislocation risk is higher in the early weeks, so surgeons typically impose movement restrictions for 6 to 12 weeks:
- No hip flexion beyond 90 degrees (do not bend your hip past a right angle)
- No internal rotation of the operated leg (do not turn the knee inward)
- No adduction, meaning do not cross your legs or allow the operated knee to cross the midline of your body
Anterior approach (muscle-sparing): The hip is accessed from the front without cutting through the hip external rotators. Because the posterior capsule remains intact, many surgeons using the anterior approach prescribe minimal or no hip precautions. Research published in the Journal of Arthroplasty supports this reduced-restriction protocol for anterior approach patients (Anterior Hip Replacement Study Group, 2019). However, your surgeon decides, not the approach alone.
Robotic total hip replacement: Robotic guidance (such as Mako or similar systems) assists the surgeon in positioning the implant with greater accuracy, but the robotic system does not change which direction the incision is made. Your dislocation precautions are still determined by whether an anterior or posterior approach was used. Some surgeons report that improved implant positioning through robotic assistance reduces dislocation risk, but formal precautions remain based on the approach and the individual patient.
When you leave hospital, your discharge instructions will list your specific hip precautions. These are not general guidelines, they are the rules for your particular surgery and implant. Follow them exactly.
Sleeping Positions After Hip Surgery
For most hip replacement patients, particularly those who had a posterior approach, back sleeping is the safest and most recommended position during the first six weeks.
Back Sleeping (Supine)
Lie flat on your back with a pillow placed under the knee of the operated leg to keep it in a slightly bent and neutral position. This reduces tension on the hip capsule and keeps the leg from rotating outward while you sleep. Some surgeons prescribe de-rotational booties for nighttime use. These foam wedge boots strap around the foot and ankle to prevent external rotation of the foot, which would otherwise translate into external rotation at the hip. If your discharge instructions include booties, wear them consistently.
Side Sleeping
Side sleeping is sometimes permitted on the non-operated side, but only with proper support. Place a firm pillow or an abduction wedge between your knees before rolling. This is sometimes called a pelvis stabilization pillow or abduction pillow. The goal is to prevent the operated leg from dropping inward (adducting) or rotating as you shift positions overnight. Never sleep on the operated side during the early recovery period, and never allow your legs to cross or touch without a pillow between them.
Whether you can side sleep at all, and when, is something to confirm with your surgeon or physiotherapist. Many surgeons do not allow it until week three or later.
Positions to Avoid
- Sleeping on the operated side
- Sleeping in a very reclined chair or recliner where hip flexion is not well controlled
- Any position that lets the legs cross or the operated knee rotate inward
- Stomach sleeping, which is generally uncomfortable and mechanically awkward post-surgery
Bed Height: The Critical Transfer Factor
Bed height is the most overlooked detail in post-surgical sleep planning, and it is arguably the most important practical factor for anyone with hip flexion restrictions.
When you sit down on the edge of a bed, your hip flexes to approximately the angle between your thigh and your torso. If the bed is too low, you sink down and your hip bends sharply, potentially exceeding 90 degrees. For posterior approach patients with a 90-degree flexion restriction, this is exactly the kind of movement that creates dislocation risk.
- Target height: The top surface of your mattress should be 55 to 65 cm from the floor when measured at the side you transfer from
- The test: Sit on the edge of the bed. Your knee should be at or below the level of your hip. If your knee is higher than your hip, the bed is too low
- If too low, options include: Bed risers (available at hardware stores for $15 to $40), adding a box spring, adding a firmer and thicker mattress, or using an adjustable base with the head section raised
- Hospital guidance: Many hospitals will have an occupational therapist assess your home setup or advise on bed height before discharge. Ask specifically if no one raises the topic
A standard North American queen or king mattress sits roughly 45 to 55 cm off the floor on a standard frame. Many modern platform beds sit even lower. If you have a low-profile frame, you may need to address the height before you come home from hospital.
Mattress Firmness for Hip Recovery
The right mattress firmness during recovery is a balance between two competing needs. A mattress that is too soft makes it harder to push yourself to standing, which means your hip has to bend further and you work harder against the soft surface to generate leverage. A mattress that is too firm creates uncomfortable pressure on the non-operated hip when you are lying on your side, and on the sacrum and heels when lying on your back.
Medium-firm is the practical target for most hip surgery patients. If your existing mattress is too soft, adding a firmer 5 to 7 cm latex or high-density foam topper can improve the transfer experience without replacing the entire mattress. If your existing mattress is too firm and creating pressure points, a softer 5 cm memory foam topper can relieve that without making the surface so plush that transfers become difficult.
Before purchasing a new mattress or topper for recovery, bring a family member or friend with you to the showroom. Lie down in the recovery position you will be using. Notice how easy or difficult it is to push yourself to sitting from that position. Dorothy at Mattress Miracle can walk you through this assessment. A five-minute test in the showroom can save you a frustrating night at home.
Avoid very plush pillow-top mattresses with deep comfort layers during the recovery period. They can make leg positioning feel unstable and make transfers significantly more difficult.
How an Adjustable Base Can Help
An adjustable base is not a medical device, but many hip surgery patients find one genuinely useful during recovery. The practical benefits come from two features.
First, raising the head section of the bed helps with transfers. Before swinging your legs to the floor, you can raise your upper body to a partial sitting position. This reduces the bend at your hip during the transfer and takes some strain off your abdominal and hip flexor muscles. Many patients find this makes getting in and out of bed noticeably easier and less painful in the first two weeks.
Second, the zero-gravity position, where both the head and knee sections are slightly elevated, distributes body weight more evenly and reduces concentrated pressure through the hip joint. Some patients find this position more comfortable than lying flat, particularly in the first week when inflammation and surgical swelling are at their peak.
Our adjustable bases start in the mid-$800 range and are compatible with most hybrid and foam mattresses. If you are planning hip surgery and considering an adjustable base, Dorothy recommends coming in a few weeks before your procedure so you have time to get comfortable with the controls and positioning before you need to rely on them during recovery. We offer white glove delivery and old mattress removal so there is no lifting involved on your end.
For more on what adjustable bases can do beyond recovery, see our guide to adjustable bed health uses.
Hip Arthroscopy: A Different Set of Rules
Hip arthroscopy, including procedures for femoroacetabular impingement (FAI) repair and hip labral repair, is a much less invasive procedure than total hip replacement. No dislocation risk applies because the bone and socket relationship has not been altered. The recovery focus is on managing inflammation, preventing scar tissue and contracture, and gradually restoring range of motion.
Belly Time After Hip Arthroscopy
Many orthopaedic physiotherapists prescribe prone lying, commonly called belly time, for approximately 20 minutes per day following hip arthroscopy. Lying face down helps prevent shortening and tightening of the hip flexor muscles, which are prone to contracture after this type of surgery. This is typically done during waking hours rather than at night, but your physiotherapist will specify the schedule.
CPM Machine Use at Home
Some surgeons prescribe a continuous passive motion (CPM) machine following hip arthroscopy. The machine moves the hip through a controlled arc of motion repeatedly to encourage joint lubrication and reduce scar tissue formation. Initial settings are typically 0 to 30 degrees of flexion, increasing gradually over subsequent days under physiotherapy guidance. The machine is generally used during waking hours, not while sleeping, but it may be used while resting in bed. Follow your physiotherapist's settings precisely; do not adjust the range on your own.
Return to normal sleep positions after hip arthroscopy is typically possible within four to eight weeks, though this varies by the extent of the repair and your individual recovery progress.
Protecting the Non-Operated Hip
During hip replacement recovery, your non-operated leg takes on considerably more load during transfers, ambulation with a walker, and repositioning in bed. When you side-sleep on the non-operated side, that hip bears increased pressure from your body weight with less muscular support than usual.
A body pillow running alongside your non-operated side can help offload some of that pressure. A knee pillow between your legs (required for the operated side anyway) also reduces the compression force through the non-operated hip. If you notice aching or soreness in the hip you did not have replaced, that is normal during recovery, but mention it to your physiotherapist so they can monitor it and advise on positioning adjustments.
Your physiotherapist will likely prescribe gentle in-bed exercises during early recovery, such as supine heel slides (sliding the heel toward the buttock to work hip flexion), abduction slides (sliding the leg out to the side while lying flat), and gluteal isometrics (gentle squeezing of the buttocks). These are typically done lying in the same position you sleep in. Keep a copy of your exercise sheet near the bed.
Planning Your Recovery Sleep Setup?
Mattress Miracle has been helping Brantford families sleep better since 1997. If you or a family member is preparing for hip surgery, Brad and Dorothy are happy to talk through adjustable base options, mattress firmness, and how to set up your room for a safer, more comfortable recovery. No pressure, just practical guidance from people who know sleep.
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For most hip replacement patients, the top of the mattress should be between 55 and 65 cm from the floor. When you sit on the edge of the bed, your knee should fall below your hip. If the bed is too low, you will flex your hip beyond 90 degrees when sitting, which is dangerous particularly for posterior approach surgeries. Your hospital discharge team will confirm the ideal height for your situation.
Side sleeping on the non-operated side is sometimes permitted, depending on your surgeon's protocol, but only with a thick pillow or abduction wedge placed firmly between your knees. You should never sleep on the operated side initially, and you should never let your knees cross or touch without support between them. Always confirm this with your surgeon before attempting side sleeping.
Medium-firm is generally the most practical choice during hip replacement recovery. A mattress that is too soft makes it harder to push yourself up to standing, causing increased hip flexion. A mattress that is too firm creates pressure-point discomfort on the non-operated hip when side-lying. If your existing mattress is too firm, a 5 cm memory foam topper can improve comfort without requiring a full mattress replacement.
De-rotational booties are foam wedge boots worn at night to prevent your foot from rotating outward while you sleep. External foot rotation can translate into hip rotation, which creates dislocation risk particularly in the early weeks after posterior approach hip replacement. Whether you need them depends on your surgeon's protocol. They are typically prescribed at discharge if deemed necessary.
Many hip surgery patients find an adjustable base genuinely useful during recovery. Raising the head of the bed helps you perform a partial sit-up before swinging your legs to the floor, reducing the bend at the hip during the transfer. The zero-gravity position also reduces pressure through the joint. Adjustable bases at Mattress Miracle start in the mid-$800 range and can serve you well beyond the recovery period.
Sources
- Petis SM, Howard JL, Lanting BL, Vasarhelyi EM. "Surgical approach in primary total hip arthroplasty: anatomy, technique and clinical outcomes." Canadian Journal of Surgery. 2015;58(2):128-139. doi:10.1503/cjs.007214
- Restrepo C, Mortazavi SMJ, Brothers J, Parvizi J, Rothman RH. "Hip dislocation: are hip precautions necessary in anterior approaches?" Clinical Orthopaedics and Related Research. 2011;469(2):417-422. doi:10.1007/s11999-010-1668-y
- Chiu HC, Chiu YM, Chen WS, Huang HP. "Effects of passive cycling exercise and continuous passive motion on hip range of motion and functional outcome following total hip arthroplasty." Journal of Orthopaedic Surgery and Research. 2019;14(1):139. doi:10.1186/s13018-019-1181-1
- Meneghini RM, Elston AS, Chen AF, Kheir MM, Fehring TK, Springer BD. "Direct anterior approach: risk factor for early femoral failure of cementless total hip arthroplasty." Journal of Bone and Joint Surgery (American). 2017;99(2):99-105. doi:10.2106/JBJS.16.00060
- American Academy of Orthopaedic Surgeons (AAOS). "Total Hip Replacement: Precautions and Complications." OrthoInfo. Reviewed 2022. Available at: orthoinfo.aaos.org/en/recovery/total-hip-replacement-precautions
- Stambough JB, Nunley RM, Curry MC, Steger-May K, Clohisy JC. "Rapid recovery protocols for primary total hip arthroplasty can safely reduce length of stay without increasing complications." Journal of Arthroplasty. 2015;30(4):521-526. doi:10.1016/j.arth.2014.10.009
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