Anterior Approach Hip Replacement

Anterior Approach Hip Replacement, also referred to as the Direct Anterior Approach (DAA) or Anterior Minimally Invasive Surgery (AMIS), is a technique for total hip replacement surgery where Dr Williams accesses the hip joint from the front (anterior) of the hip rather than from the side (lateral) or back (posterior). The key difference is that this approach operates between naturally occurring intervals between muscles. Therefore, unlike other approaches to the hip, no muscles or tendons need to be cut (and repaired) to access the joint.

With the anterior approach, Dr Williams reaches the hip joint through a small incision at the front of the hip. Because the major muscles that stabilise the hip are preserved, patients often experience less muscle damage, reduced postoperative pain, and faster early recovery than with traditional approaches. However, the success of the procedure still depends on careful patient selection, surgeon experience, and appropriate rehabilitation.

Following his general orthopaedic surgical training, Dr Williams undertook 12 months of additional fellowship training to learn the intricacies of the anterior approach and has since used it for over 95% of total hip replacements in his practice, with good clinical results.

Who Is Suitable for Anterior Approach Hip Replacement?

Dr Williams prefers the anterior approach for the majority of patients requiring total hip replacement. If you think the anterior approach may be suitable for you, you are probably right. Dr Williams is always happy to have a detailed discussion about the available options.

If you are suitable for total hip replacement, you are likely suitable for anterior approach hip replacement, including if you have:

Osteoarthritis of the hip that is affecting your quality of life: If your life is becoming progressively more limited and non-operative treatments have been maximised, you may benefit from an anterior approach hip replacement.
Good General Health: Patients should be in reasonably good health to undergo joint replacement surgery. Dr Williams will discuss your medical history with you and seek to optimise your condition before surgery.
Realistic Expectations: Patients should have realistic expectations about the outcomes of hip replacement surgery. While the anterior approach offers advantages, it may not be suitable for all patients or guarantee a perfect result. While much online information touts the anterior approach as having a ‘faster’ recovery, at the end of the day, the bones still need to heal to the implants, which occurs at the same rate regardless of approach. While the early recovery after the anterior approach may be more comfortable and have less restrictions, Dr Williams believes it is safest to delay a return to higher-impact exercise for 3-4 months to allow the bone and implants to form a secure bond and potentially lower the long-term risk of ‘loosening’.

Benefits of Anterior Approach Hip Replacement

Minimised Muscle Damage: The technique minimises muscle damage by using a naturally occurring interval between the muscles at the front of the thigh, rather than splitting, cutting or releasing any muscles or tendons. This may result in improved recovery and reduced muscle weakness.
Comfortable Recovery: Patients undergoing the direct anterior approach often experience a more comfortable early recovery period. Because major muscles are not cut during surgery, there is minimal soft-tissue damage, resulting in less pain and a more comfortable return to normal activities compared to traditional extensile approaches.
Shorter Hospital Stay: With modern recovery protocols, many patients undergoing this procedure can expect a shorter hospital stay than traditional hip replacement. The usual length of hospital stay is 1-2 nights, although this depends on individual factors and Dr Williams’ recommendations.
Less Postoperative Pain: The minimally invasive procedure typically leads to less postoperative pain and discomfort. This can often be managed effectively with pain medications, regular ice and physical therapy. Some postoperative discomfort is, however, to be expected, especially on days 1 and 2; it improves with time.
Improved Range of Motion: Total hip replacement usually results in a significantly improved range of motion compared to the preoperative state. The anterior approach may be better suited to patients who require high flexion ranges or those with hypermobility, due to the increased hip stability.
Reduced Risk of Dislocation: The direct anterior approach may reduce the risk of hip dislocation, a potential complication of hip replacement surgery. This is because the technique preserves important hip structures at the back of the hip, such as the short external rotator tendons and hip capsule, which stabilise the hip when sitting and crouching down. As such, Dr Williams does not recommend any ‘hip precautions’ such as the ‘90-degree rule’ after anterior approach hip replacement.
Smaller Incisions: This approach uses smaller incisions, usually 6-8cm, resulting in improved cosmetic outcomes and reduced scarring.
High Patient Satisfaction: Many patients report high satisfaction with outcomes of direct anterior hip replacement, owing to rapid recovery and reduced postoperative pain.

Preparation Before Anterior Approach Hip Replacement

Dr Williams endeavours to make the journey to surgery as smooth as possible; however, there are a few important steps required to minimise risks and improve safety.

Medical assessment: During your consultation, Dr Williams will take a thorough history of your hip symptoms, how they are impacting your quality of life, and your long-term goals. He will also perform a physical examination of your hip, taking care not to cause undue discomfort. Your medical history will also be assessed, including any regular medications, medical diagnoses and past surgeries.
Referral to other specialists: If indicated, Dr Williams may refer you for further assessment by a perioperative physician or cardiologist to make sure surgery is as safe as possible.
Routine pathology tests: All patients require standard blood tests, which can be done at a local pathology collection centre. Skin swabs will also be performed to assess for skin colonisation with Staphylococcus aureus, which increases the risk of surgical infection and can be treated before surgery.
Imaging and planning: Dr Williams uses functional X-rays in the standing and sitting positions and three-dimensional CT scans to assess each patient’s hip anatomy and plan accurate implant positioning
Medication review: Some medications, including blood thinners and certain supplements, may need to be stopped or adjusted
Weight and fitness optimisation: Maintaining a healthy weight and improving leg strength can reduce the risk of complications and speed recovery.
Pre-habilitation physiotherapy: Learning exercises before surgery helps patients move more confidently afterwards, and strengthening the non-operative leg is useful to support the operated side. Dr Williams acknowledges that many patients requiring hip replacement surgery are in severe pain; however, formal preoperative prehabilitation may not be possible, so there is no mandated prehabilitation period.
Smoking cessation: Smoking increases infection and wound-healing risks and should be stopped well before surgery. Smoking should not be replaced with other forms of nicotine deliver,y as these can also increase risks. Dr Williams encourages patients to use their surgery as motivation to stop smoking for good.
Home preparation: Arranging support from family or friends, removing trip hazards, and preparing a comfortable recovery space are important.
Education: Understanding the procedure, hospital stay, and recovery expectations reduces anxiety and improves outcomes

Anterior Approach Hip Replacement Procedure

The surgical procedure itself usually takes 1-2 hours and involves several key steps:

You will receive anaesthesia to ensure you are comfortable and pain-free during the procedure. Dr Williams usually prefers that you have a combination of a general anaesthetic, combined with a short-acting spinal anaesthetic. The advantage of this approach is that the pain-blocking effect of the spinal means that a lighter general anaesthetic can be used, reducing postoperative ‘grogginess’. Dr Williams’ anaesthetist will usually give you a call in the days leading up to surgery to discuss your preferences and the best option for you based on your medical background.
To access the hip joint, a small incision, typically 6-8cm long, is made on the front of your hip. Dr Williams regularly performs both the standard vertical and oblique ‘bikini’ incisions depending on patient anatomy and preference.
The tensor fascia lata and rectus femoris muscles are moved aside rather than cut. This minimises muscle trauma.
The hip joint capsule is opened, revealing the arthritic ball-and-socket.
The damaged or arthritic parts of your hip joint are carefully removed, and the bones are prepared with specialised instruments. Intra-operative x-ray is utilised to ensure accurate execution of your patient-specific plan.
‘Trial’ implants are inserted to test the stability of the new hip and leg length, then the real artificial hip is inserted. This implant may have a combination of metal (titanium or stainless steel), plastic (highly cross-linked polyethylene), and ceramic components.
Once the implant is securely in place, final X-rays are taken, and the wound is closed with several layers of sutures. The final skin layer is closed with dissolvable sutures underneath the skin, surgical glue and a sterile, waterproof dressing.
After the surgery, you will be monitored in a recovery room before being transferred to a hospital or designated recovery area.

What To Expect After an Anterior Approach Hip Replacement?

What to expect in the hospital:

Recovery: You will wake up in ‘recovery’, where you will be monitored for 30-60 minutes. Usually, the spinal block is still partially in effect, and so there will be very little pain and reduced movement and sensation in the legs.
Early mobilisation: Dr Williams encourages early mobilisation - most patients will stand on their new hip that same afternoon or the next morning with physio and the support of a frame. Full weight bearing through the leg is allowed.
Pain relief: Your pain will be well managed with ‘multimodal analgesia’ including cryotherapy (ice), and a combination of medications usually including paracetamol, anti-inflammatories and a short and long-acting opioid medication like Endone or Palexia. The exact regimen will be determined by Dr Williams and your anaesthetist after discussion with you.
Day 1: X-rays and blood tests will be performed on the day following surgery. If you had a bladder catheter inserted, this will usually be removed the morning after surgery.
Physiotherapy: The in-hospital physiotherapists will see you 1-2 times daily to get you up and moving and show you basic exercises.
Discharge planning: Most patients go home after 1 or 2 nights in the hospital. For patients who require inpatient rehabilitation, the referral is made by the ward's nurse in charge after the operation.

What to expect at home:

Discharge destination: Most patients can recover in their own home after 1-2 nights in hospital. Remember, you are not sick, you are just on the road to recovery.
Pain relief: The regimen at home will be much the same as in the hospital - you will go home with a supply of strong pain killers and guidelines about when to take them. Whilst it is good to stay ahead of pain, many patients only require Panadol and an anti-inflammatory after the first few days. A longer-acting painkiller may still be needed at nighttime to help with sleep for the first week or two.
Physiotherapy: For the first two weeks, no formal physiotherapy is required - regular short walks and the gentle exercises given to you on the sheet from the hospital are all that is required. You are in healing mode, not strengthening mode.
Wound care: The same surgical dressing should be kept intact for 2 weeks. It is normal for there to be surrounding bruising and often a small amount of dried blood to be visible. You may get it wet in the shower and pat it dry afterwards. If you are worried about the dressing, please contact us.
Mobility: Getting about the house will take a little more effort than usual. You will likely still require 1 or 2 crutches in the first week or two, depending on Dr Williams’ instructions. Try to set up a convenient recovery station with everything you need close by (medications, water, the TV remote / a book, snacks, phone and charger, etc.). Try to walk for a little longer each week.
Mood: It is quite common for patients to experience the ‘post-op blues’ after a major operation. Once the adrenaline of early recovery and the feeling of relief wear off, some patients can feel a bit down. Poor sleep, increased dependence on others and boredom can all contribute to this. Keeping busy, getting out of the house, reaching out to support people, and focusing on small day-to-day improvements can all help you get back into a better headspace.

Anterior Approach Hip Replacement Prognosis

The general success rate of total hip replacement surgery is very high, with over 95% of patients feeling better or ‘much better’ after their surgery, according to data from the Australian Orthopaedic Association Joint Replacement Registry. Total hip replacement, when correctly indicated, is one of the best orthopaedic operations for improving a patient’s quality of life.

Anterior hip replacement typically leads to reliable improvements in pain, function and mobility. Whilst relief of pain is the primary goal of surgery, most patients also experience significant improvements in their range of motion and limp, allowing them to get back to the things they enjoy.

Most patients after total hip replacement can safely get back to:

Unlimited walking, including bushwalking/hiking
Cycling
Swimming
Exercises classes
Resistance training
Dancing
Doubles tennis
Pickleball
Occasional gentle jogging

Contact sports and regular running are not routinely recommended after total hip replacement; however, Dr Williams is happy to discuss this on a case-by-case basis.

The longevity of modern hip replacement is excellent, with over 90% of new hips lasting 20 years or more.

Anterior Approach Hip Replacement Risks

While Anterior Approach Hip Replacement is generally safe and effective, as with any surgical procedure, it carries risks and potential complications. It's essential to be aware of these risks before undergoing surgery. Common risks and complications may include:

Infection: With careful surgical technique and preventative antibiotics, the risk of serious infection is very low, at less than 1%. If it does occur, however, artificial joint infection can be difficult to clear and require multiple further surgeries, compromising the end result. Management of risk factors like smoking, diabetes and obesity can help reduce the risk.
Fracture: Hip replacement is a very mechanical operation that requires machining and instrumentation of the bones. Small fractures can occur in less than 1% of cases that require management during surgery or altered rehabilitation guidelines. Fractures can also occur around the hip replacement in the future if a patient has a heavy fall, which can lead to reoperation.
Implant Loosening: Over time, the artificial hip joint may experience loosening, in which the bond between the bone and the metal implant breaks down, leading to micromotion and pain. Whilst this is still quite rare, it is one of the main causes of revision surgery. It is more common in younger, highly active patients.
Dislocation: This is when the artificial ball comes out of the socket. This used to be one of the main reasons for patients requiring redo surgery, but has reduced with modern techniques. While the anterior approach can reduce the risk of dislocation, it does not completely eliminate it.
Leg Length Discrepancy: In some cases, there may be a slight difference in leg length noticed after surgery. Dr Williams used personalised CT-based planning and intra-operative live X-ray to make sure your hip replacement is as accurate as possible.
Blood Clots: Blood clots can develop in the legs (deep vein thrombosis) or travel to the lungs (pulmonary embolism) after surgery. Measures such as blood thinners, compression stockings, and early mobilisation are used to reduce this risk.
Nerve or Blood Vessel Damage: Whilst it is quite common to get a little bit of numbness next to the incision, injury to major nerves or vessels, such as the femoral or sciatic nerve or the femoral artery, is exceptionally rare during anterior approach hip replacement. The numbness next to the scar is due to stretching or injury to the branches of the lateral femoral cutaneous nerve, which usually improves over the first 12 months. It is rare for this to be a cause of ongoing discomfort.
Persistent Pain: Although most patients experience pain relief, some may experience ongoing hip pain or discomfort after surgery. This may be due to soft-tissue issues such as gluteal tendinopathy/bursitis or hip flexor irritation (psoas tendinitis).

How do I know if I’m ready for an anterior approach hip replacement?

The timing of hip replacement surgery is a very individual decision. Unlike surgery to fix broken bones or to remove a cancer, there is usually no urgency to performing total hip replacement, as hip osteoarthritis is usually a slowly progressive, chronic condition. There are a few exceptions to this, such as when total hip replacement is needed urgently for a traumatic fracture or rapid collapse due to avascular necrosis (when the blood flow to the ball of the femur has been compromised).

As hip replacement is a ‘quality of life’ operation, Dr Williams sees his role as a facilitator to help you make an informed decision about when to proceed, once you are fully educated about the risks and benefits of the procedure.

It is rare that delaying the procedure leads to a worse long-term outcome, though there may be certain instances where Dr Williams would recommend earlier surgery, particularly if there are large bone cysts at risk of collapse, or the severity of the arthritis is causing frequent falls.

Osteoarthritis is a fluctuating condition with good and bad patches, though it typically deteriorates over time.

Patients living with hip osteoarthritis long-term may experience:

Worsening pain: Pain may become constant and interfere with sleep
Reduced mobility: Walking distance and daily activity decline
Muscle weakness: Reduced use leads to muscle wasting and frailty
Joint stiffness: Making surgery and recovery slightly more difficult
Mental health impact: Chronic pain can affect mood and confidence
Compensation injuries: Strain on the opposite hip, knees, or lower back

However, surgery should only proceed when:

Non-surgical treatments are no longer effective for you
You are medically optimised (other conditions are well controlled)
The benefits clearly outweigh the risks
You feel informed and mentally prepared to proceed.

What is Anterior Approach Hip Replacement?