Questions & Answers · Hip
Anterior vs. posterior hip replacement — which is better?
Neither approach is universally better. Large studies show excellent results with both, and the surgeon's experience with their preferred approach predicts your outcome better than the approach itself. Anterior tends toward a faster first few weeks with fewer early movement precautions; posterior offers the most versatile exposure, which matters for complex anatomy. At Sterling Ridge, serving The Woodlands, Spring and Montgomery County, Dr. Brian Flowers uses the anterior approach, and Dr. Rohan Gheewala also performs hip replacement, including complex and revision cases.
What each approach actually means
- Anterior: entry from the front of the hip, between muscle planes, without detaching the muscles that stabilize the joint. Often a quicker early recovery and fewer initial precautions; not ideal for every body type or anatomy.
- Posterior: entry from the back. The most common and versatile approach worldwide, with the short external rotator muscles released and repaired, and modern repair techniques shrinking the old precaution lists.
- Either way: robotic-assisted planning handles what patients actually worry about, implant position and leg length, regardless of approach.
The comparison, with the numbers
Randomized trials and national registries answer different questions. Trials compare matched patients head-to-head; registries show what happens across tens of thousands of real surgeons. Both are in the table.
| Measure | Anterior | Posterior | Source |
|---|---|---|---|
| Hip function at 6 weeks | About 8 points higher | Lower early, gap closes with time | Ang et al., 2023 |
| Length of stay | 0.33 days shorter | Slightly longer | Ang et al., 2023 |
| Operative time | About 17 minutes longer | Shorter | Ang et al., 2023 |
| Pain, days 1–2 | Less | More | Wang et al., 2024 |
| Dislocation | No difference in RCTs; 61% lower risk in a 38,399-hip registry | More revisions for dislocation in a 122,345-hip registry | Charney et al., 2020 |
| Fracture risk | Higher intra-operative fracture; more revisions for fracture/loosening | Lower | Hoskins et al., 2020 |
| Nerve irritation | More lateral femoral cutaneous nerve irritation (thigh numbness) | Rare | Wang et al., 2024 |
| Long-term results | 2-year revision 1.78%; no difference in overall early revision | 2-year revision 2.28%; no difference in overall early revision | Charney et al., 2020 |
In plain English: a meta-analysis of 24 randomized trials found anterior patients about 8 points ahead on hip function at 6 weeks, out of the hospital a third of a day sooner, and in surgery about 17 minutes longer, with no difference in dislocation, fracture or blood clots (Ang et al., 2023). A 33-study review agreed on less pain in the first two days and a shorter stay, and flagged the costs: more fractures during surgery and more irritation of the lateral femoral cutaneous nerve, which shows up as a numb patch on the outer thigh (Wang et al., 2024).
The registries add the long view. Across 122,345 Australian hips there was no difference in overall early revision between approaches, but posterior hips were revised more often for dislocation and anterior hips more often for fracture and loosening (Hoskins et al., 2020). In Kaiser Permanente's 38,399-hip registry, the anterior approach carried a 61% lower dislocation risk and a 2-year revision rate of 1.78% versus 2.28% (Charney et al., 2020). Those are meaningful differences, and they are also small absolute numbers in both columns.
What Dr. Flowers does, and why
Dr. N. Brian Flowers, MD, MPT, FAAOS performs hip replacement through the anterior approach. Before medical school he practiced as a licensed physical therapist, and he describes the choice in those terms: the anterior route works between muscles rather than through them, which is the pattern that lines up with the earlier function and shorter stay in the randomized trials above. He completed his fellowship in limb lengthening and complex reconstruction at the Hospital for Special Surgery, is a Fellow of the American Association of Hip and Knee Surgeons, and is certified on the Mako robotic system, which he uses to plan cup position and leg length from a CT scan before the first incision. The approach is the route in; the plan and the rehab are the rest of the operation, and the therapy team that runs your recovery is on the same campus.
What he will not tell you is that anterior guarantees a better result. The data say it changes the first six weeks and shifts the kind of rare complication you're exposed to, not whether you'll have a good hip at ten years.
Who is not a candidate for anterior
The anterior approach depends on getting clear access to the front of the hip and on the femur tolerating the exposure. In the consult, the surgeon weighs things like:
- Body shape over the incision. A large abdominal fold that sits over the front of the hip raises wound concerns and makes the exposure harder.
- Femur shape and bone quality. The anterior approach puts more stress on the femur during preparation, which is why registries record more fracture and loosening revisions with it (Hoskins et al., 2020). Unusual anatomy, prior surgery or weak bone can tip the decision toward posterior.
- Revision and complex reconstruction. When the job is removing an old implant, rebuilding bone or correcting a deformity, the posterior approach's wider exposure usually wins. That is Dr. Gheewala's lane, and the approach follows the problem.
- Hardware or deformity from old injuries around the hip that the surgeon needs to reach from behind.
None of these is a verdict on you. They are the reasons an honest surgeon may say "posterior for you" and still expect an excellent result.
The question to ask instead
Not "do you do anterior?" but "which approach do you do most, and what are your results with it?" A surgeon deeply practiced in their approach beats a surgeon dabbling in the trendy one, every time. Ours will tell you exactly what they'd use for your anatomy and why. Ask them to draw it.
Common questions
Is anterior hip replacement really less invasive?
Both approaches use a similar-length incision and replace the same joint. The difference is the route: anterior goes between muscles at the front of the hip without detaching them; posterior goes through the back and releases, then repairs, the short rotator muscles. In 24 randomized trials the anterior approach gave about 8 more points of hip function at 6 weeks and a 0.33-day shorter stay, and the gap closed over time (Ang et al., 2023).
Does the anterior approach dislocate less?
In randomized trials, no measurable difference (Ang et al., 2023). In large registries, yes: a Kaiser study of 38,399 hips found a 61% lower dislocation risk with the anterior approach (Charney et al., 2020), and the Australian registry saw more dislocation-related revisions after posterior surgery but more fracture and loosening revisions after anterior (Hoskins et al., 2020). The trade is real in both directions.
Which approach does Dr. Flowers use?
Dr. Brian Flowers performs anterior-approach hip replacement, planned on a CT scan with Mako robotic assistance. He trained in complex reconstruction at the Hospital for Special Surgery and practiced as a physical therapist before becoming a surgeon. Dr. Rohan Gheewala also performs hip replacement here, and the approach for complex or revision cases is chosen for the problem in front of them. Consults are at our offices in The Woodlands, Spring and Woodforest; qualified patients have surgery outpatient at the Sterling Ridge / Woodforest Ambulatory Surgical Center, and our surgeons also hold privileges at several area hospitals to accommodate insurance plans and medical needs.
Will I have hip precautions after surgery?
Fewer with anterior, and shorter lists than you may have read about with posterior. Either way, OrthoInfo describes most precautions lasting about 6 to 8 weeks while the soft tissues heal (AAOS OrthoInfo). Your surgeon and our in-house therapy team give you the list that fits your approach and your anatomy.
Sources
- Ang JJM et al. Direct anterior versus posterior approach THA: meta-analysis of 24 randomized trials. 2023.
- Hoskins W et al. Early rate of revision by surgical approach, 122,345 THAs, Australian registry. JBJS 2020.
- Charney M et al. Approach and dislocation/revision risk, 38,399 THAs, Kaiser Permanente registry. 2020.
- Wang et al. Anterior versus posterior approach THA: review of 33 studies. 2024.
- AAOS OrthoInfo. Activities After Total Hip Replacement.
Medically reviewed by Keith W.V. Johnson, MD, FAAOS · Updated October 20, 2026