A standard total hip replacement takes roughly one to two hours of actual operating time for most patients. That range is wide because “surgery time” depends on several variables: which surgical approach your surgeon uses, whether cement is involved, the type of anesthesia, whether a robot assists, and factors specific to your anatomy and health. The time you spend in the operating room will be longer than the surgery itself, because it includes preparation and positioning before the first incision and monitoring afterward. Understanding what pushes the clock in one direction or the other can help you set realistic expectations for your procedure day.
What the Clock Actually Covers
When people ask how long hip replacement surgery takes, they usually mean the time from when they are wheeled into the operating room to when they leave it. But only part of that window involves the surgeon actually operating. The rest is consumed by anesthesia setup, patient positioning on the table, draping, and the initial minutes of post-surgical monitoring before transfer to a recovery area. Depending on the facility, these non-surgical portions can add 30 to 60 minutes on top of the cutting-and-implanting work. So if someone tells you the “OR time” was two and a half hours, the surgeon may have been actively operating for closer to 90 minutes.
After the operating room, you will spend time in a post-anesthesia care unit while the anesthesia wears off and staff monitor your vitals. This recovery room stay is separate from the surgery itself, but it is part of the day’s timeline. All told, plan on being away from your pre-op bed for somewhere around three to four hours from start to finish, though the surgical portion is the shorter piece of that window.
How the Surgical Approach Changes Operating Time
The two most common ways a surgeon accesses your hip joint are through the front of the hip (the direct anterior approach, or DAA) and through the back (the posterior approach). There is also a lateral approach, which enters from the side. Which route your surgeon takes is one of the biggest controllable factors affecting how long you are on the table.
A large systematic review and meta-analysis found that the direct anterior approach added roughly 17 minutes of operating time compared with the posterior approach.
1PubMed Central. Comparing direct anterior approach versus posterior approach or lateral approach in total hip arthroplasty: a systematic review and meta-analysis An umbrella review of multiple meta-analyses of randomized controlled trials confirmed this pattern, finding the posterior approach reduced operating time in five out of eight meta-analyses, with a mean difference ranging from about 14 to 19 minutes.2PubMed Central. Direct Anterior Approach and Posterior Approach for Total Hip Arthroplasty: A Systematic Umbrella Review of Meta-Analyses of Randomized Controlled Trials
The picture gets more nuanced, though, when you look specifically at studies using enhanced recovery protocols. A separate meta-analysis focused on enhanced recovery programs found no significant difference in surgery time between the two approaches.3PubMed Central. Comparison of direct anterior vs. posterior approach in primary total hip arthroplasty: a systematic review and meta-analysis on enhanced recovery after surgery This suggests that when surgeons and hospitals optimize everything around the procedure, the time gap narrows or disappears. It also reflects that surgeons who do a high volume of anterior-approach cases tend to close the speed gap with experience.
Surgeon experience is probably the most important variable hiding inside the approach comparison. The anterior approach has a steeper learning curve. Early in a surgeon’s experience with it, the procedure takes longer and complication rates may be slightly higher. After dozens or hundreds of cases, the difference fades. If your surgeon has performed several hundred hip replacements via the anterior approach, the added minutes reported in the meta-analyses may not apply to you at all.
Cemented Versus Cementless Implants
The implant itself comes in two basic flavors: cemented, where a fast-setting bone cement locks the implant into place, and cementless (also called press-fit), where the implant has a textured surface that your bone grows into over time. In younger, active patients with good bone quality, cementless implants are most common. In older patients with weaker bone, cemented fixation is often preferred because it provides immediate stability.
Cemented implants take longer to install. A prospective study comparing the two in elderly patients found that the cemented group averaged about 95 minutes of operative time, versus roughly 86 minutes for the cementless group.4Journal of Orthopaedic Case Reports. Comparison of Cemented Versus Cementless Total Hip Arthroplasty in Elderly Patients: A Prospective Cohort Study The difference comes from the extra steps of preparing the cement, applying it, inserting the component, and then waiting for it to harden before proceeding. It amounts to roughly 8 to 10 extra minutes, which is modest in isolation but stacks with other factors.
Does the Type of Anesthesia Matter?
You might assume that the choice between being fully asleep (general anesthesia) and having a spinal block (regional anesthesia) only affects your experience as a patient, not how long the surgery takes. But the anesthesia type actually changes the clock. A large propensity-adjusted study found that general anesthesia for hip replacement was associated with about 12 extra minutes of operative time compared with spinal anesthesia, plus an additional 5 minutes in the post-operative room.5PubMed Central. General Compared with Spinal Anesthesia for Total Hip Arthroplasty
The reasons are practical. General anesthesia involves intubation and airway management, which takes time to set up and reverse. Spinal anesthesia is quicker to administer and the patient can be positioned on the table faster. The surgical work itself may not be materially different, but the bookend steps are shorter. Spinal anesthesia also tends to reduce blood loss and lowers the risk of certain complications like blood clots, which is why many hip replacement surgeons and anesthesiologists prefer it when the patient is a candidate for it.
For you as a patient, the choice of anesthesia is usually made collaboratively between your anesthesiologist and your surgeon based on your medical history. If you have spinal conditions that make a spinal block difficult or risky, general anesthesia will be used. The 12-minute difference is unlikely to change your outcome in any meaningful way, but it is worth understanding that it contributes to the range of times you will hear quoted.
Robotic-Assisted Hip Replacement
Robotic-assisted surgery has become a major marketing point for hospitals and orthopedic practices. In hip replacement, robotic systems help the surgeon plan implant placement using a 3D model of your pelvis and then guide the bone preparation with robotic arms. The goal is more precise implant positioning, not faster surgery.
In fact, robotic assistance tends to add time rather than save it. A systematic review and meta-analysis found that robotic-assisted hip replacement trended about 23 minutes longer than conventional surgery, though the difference was not statistically significant because of wide variation across studies.6PubMed Central. Robotic-assisted compared with conventional total hip arthroplasty: systematic review and meta-analysis A separate analysis comparing robotic surgery to computer-navigated surgery found the robotic technique took about 10 minutes longer, with navigation-assisted uncemented hip replacements averaging around 60 minutes and cemented ones around 72 minutes.7EPiC Series in Health Sciences. A Detailed analysis of Time taken in Robotic Surgery for Total Hip Replacement Arthroplasty and comparison with computer assisted navigation in Total Hip Replacement Arthroplasty
The extra time comes from registering the robot to the patient’s anatomy, verifying landmarks, and the more deliberate pace of bone preparation under robotic guidance. As with the anterior approach, the learning curve matters: early robotic cases take substantially longer than later ones. Whether robotic assistance leads to better long-term implant survival is still an open question. The technology is promising for implant positioning accuracy, but if you were hoping it would mean a shorter operation, it will likely mean the opposite.
Why Teaching Hospitals May Take Longer
If your surgery is performed at an academic medical center where surgical residents are being trained, your operation may take longer than the same procedure at a private practice or community hospital. A study of revision hip replacements (a more complex procedure than a first-time replacement, but the training dynamic is similar) found that having a resident involved increased total operative time by about 28 minutes on average, with resident cases averaging roughly 161 minutes versus 135 minutes without a resident.8Rev. bras. ortop.. The Impact of Resident Involvement on Patient Outcomes in Revision Total Hip Arthroplasty
This is not a reason to avoid teaching hospitals. The attending surgeon is present and directing the operation throughout. Academic medical centers often have more resources, more experienced anesthesia teams, and better infrastructure for managing complications. But if you are comparing time estimates and your surgery is at a teaching hospital, this is one reason the quoted time may be longer than what you have heard from friends who had their surgery elsewhere.
The Operating Room Team Makes a Difference
One factor that rarely comes up in patient conversations but significantly affects operating time is how well-coordinated the surgical team is. A study examining the effect of having one dedicated, consistent team member in the operating room found that total operating room time for hip replacements dropped by about 16.5 minutes, and turnover time between cases dropped by nearly 19 minutes, when a single familiar team member was present for every case.9Journal of Orthopaedic Experience & Innovation. One Dedicated Operating Room Team Member Improves Total Joint Arthroplasty Efficiency Combined, that represents over 35 minutes saved per case in total room time.
The reason is straightforward: a team member who knows the surgeon’s preferences, the instrument sequence, and the implant system can anticipate the next step before being asked. When the team rotates constantly and nobody has done the case with that surgeon before, there are pauses, miscommunications, and delays. For you as a patient, this is largely invisible. But it helps explain why the same surgery with the same surgeon can take 75 minutes on a Tuesday and 100 minutes on a Thursday. The difference is often the team, not the patient.
Both Hips at Once
Some patients need both hips replaced. The question of whether to do them simultaneously (under a single anesthesia session) or in two staged surgeries separated by weeks or months has significant time implications.
A systematic review of 12 studies found that the mean operating time for simultaneous bilateral hip replacement was about 171 minutes (just under three hours), while the cumulative operating time for two staged surgeries averaged about 191 minutes.10PubMed Central. Simultaneous versus staged bilateral total hip arthroplasty: a systematic review and meta-analysis In nearly every study reviewed, doing both at once was faster in total than doing them separately, which makes sense: you only go through anesthesia setup, positioning, and closing procedures once instead of twice.
The time savings are real, but the decision to do both hips simultaneously is not made purely on efficiency. The longer single operation carries higher blood loss and greater physiological stress. Simultaneous bilateral replacement is generally reserved for otherwise healthy patients who can tolerate the extended procedure. Your surgeon’s recommendation will depend on your age, overall health, and how severe both hips are.
Same-Day Discharge and What It Means for Surgery Length
One of the biggest shifts in hip replacement over the past decade is the move toward same-day discharge. Where patients once spent three to five days in the hospital after surgery, many now go home the same day. This trend has been enabled by less invasive surgical techniques, better pain management, and streamlined recovery protocols.
A decade-long study of same-day discharge hip replacements found the practice has expanded to older and heavier patients over time. The mean age of same-day patients rose from 57 to 60, and the percentage of patients over 70 nearly doubled. Despite this broadening of eligibility, no patient in the study was readmitted within the first 24 hours of surgery.11PubMed. Ten Year Experience With Same Day Discharge Outpatient Total Hip Arthroplasty: Patient Demographics Changed, but Safe Outcomes Were Maintained A separate study at an ambulatory surgery center reported a successful same-day discharge rate of about 98.5%.12PubMed. The Effect of Surgical Approach on the Outcomes of Same-Day Discharge Outpatient Total Hip Arthroplasty at a Single Ambulatory Surgery Center
Same-day discharge does not mean a shorter surgery, exactly. The operating time is largely the same whether you are staying overnight or leaving that afternoon. What changes is the surrounding infrastructure: faster anesthesia protocols, more aggressive early mobility, and pre-arranged home support. If your surgeon offers same-day discharge and you are a candidate, the surgery itself will still take one to two hours. The difference is what happens afterward.
What Adds Up and What Does Not
It helps to think about operating time as a stack of factors, some of which add minutes and some of which subtract them. A posterior approach with a cementless implant, spinal anesthesia, an experienced surgeon, and a well-coordinated team might genuinely finish in under an hour. An anterior approach with cemented fixation, general anesthesia, robotic guidance, and a resident assisting could push well past two hours. Most patients fall somewhere in the middle.
What rarely affects the clock in a meaningful way is your body weight. Obesity is associated with higher complication rates and more difficult surgical exposure, but the added time is modest compared to the factors above. Similarly, your age alone does not strongly predict surgery length, though frail or osteoporotic bone may require more careful preparation. The factors that matter most are the choices made by the surgical team: approach, implant type, technology used, and the team’s familiarity with the procedure.
Revision Surgery Is a Different Animal
Everything discussed so far applies to a primary (first-time) hip replacement. If you are having a revision, where a previously implanted hip is being removed and replaced, the timeline changes substantially. Revision surgeries routinely take two to three hours or more, because the surgeon must remove the old implant (which may be well-fixed to bone or surrounded by scar tissue), address any bone loss, and then fit a new implant into a more complex anatomical situation. The study on resident involvement mentioned earlier found revision cases averaging around 135 to 161 minutes even without complications, and complex revisions with significant bone defects can exceed four hours.
If you have been told you need a revision, the operating time estimate your surgeon gives you will be specific to your situation. The condition of the existing implant, the reason for revision (infection, loosening, fracture, dislocation), and the type of reconstruction needed all change the timeline in ways that make generalizations less useful. Ask your surgeon directly, and expect a wider range than you would hear for a first-time replacement.
Preparing for the Day
Knowing what to expect for timing helps you plan practically. You will likely arrive at the hospital or surgery center one to two hours before your scheduled surgery time for check-in, final lab work, IV placement, and anesthesia consultation. The surgery itself will take one to two hours for a straightforward primary replacement. Recovery room time adds another one to two hours. If you are going home the same day, plan on being at the facility for roughly five to seven hours total. If you are staying overnight, the clock matters less, but understanding the surgical portion helps calibrate your expectations.
One practical tip: the time your surgeon quotes you is the “skin to skin” time, meaning from the first incision to closing the wound. The time the facility quotes you is usually the total room time, which includes all the non-surgical minutes. When your surgeon says “about an hour” and the scheduler says “plan for three to four hours,” they are both telling you the truth from different reference points. Asking which number they mean can save you unnecessary worry when things seem to be running longer than expected.