Femoroacetabular Impingement (FAI): Why Your Hip Pinches and What To Do About It

Key Takeaways

• Hip impingement is an early contact between the ball and socket, so the pinch usually appears in deep bending, long sitting and pivoting.
• Diagnosis needs symptoms, examination findings and imaging to agree, because cam and pincer shapes are common in people with no pain.
• Guided strengthening, load changes and movement retraining are the usual first step, with surgery weighed up when symptoms persist.
• Referrals, Medicare arrangements and private cover shape the Australian pathway, so knowing the sequence saves time and unexpected cost.

That deep pinch at the front of the hip when you sink into a squat, climb out of a low car seat or push through the last kilometre of a run has a cause. Femoroacetabular impingement (FAI) is one of the more common explanations in younger, active people. The pain comes from bone meeting bone slightly earlier than the joint is built for, catching soft tissue in between.

Hip impingement unsettles people because the pain shows up in everyday positions and rarely improves by waiting it out. The mechanism is well understood, the assessment follows a clear sequence, and most people begin with treatment that involves no surgery.

Where symptoms persist despite sensible activity changes, the structural side is worth assessing. A hip preservation surgeon reviews whether the shape of the joint is driving your pain and what a joint-preserving approach could offer. That conversation usually comes later, once guided rehabilitation has had a fair run.

What Femoroacetabular Impingement Is

The hip works as a ball and socket joint. The head of the thigh bone, or femur, sits inside a cup in the pelvis called the acetabulum. Smooth cartilage lines both surfaces, and a rim of tissue called the labrum seals the socket. Impingement describes early, repeated contact between those surfaces during movement. The shapes behind it, and the damage they can cause, take a few recognised forms:

Cam-Type Impingement

In cam impingement, the head of the femur is not quite round, leaving a bump where the head meets the neck. As the hip bends and turns inward, that bump is driven into the socket and can shear the cartilage and labrum. Cam shapes appear more often in men and are thought to develop during the teenage growth years, particularly in people who played high-impact or pivoting sport while the growth plate was still open.

Pincer-Type Impingement

Pincer impingement comes from the socket side. The rim of the acetabulum covers more of the femoral head than usual, or faces slightly backwards, so the neck of the femur meets the rim early in movement. The labrum sits in that contact zone and may be compressed against bone over time. Pincer patterns are reported more often in women and can be linked with a deep socket or extra bone along the rim.

Mixed-Type Impingement

Many hips show both features, with a bump on the femur and extra cover on the socket. Mixed patterns are the most frequently reported form. The pattern rarely changes the first stage of treatment, though it matters if a procedure is planned.

Impingement-Related Joint Damage

Repeated contact rarely stays confined to bone. The labrum can fray or tear where it is pinched, which may produce catching or clicking, and the cartilage beside it can thin over time. Research has associated cam morphology with a higher chance of hip osteoarthritis later in life, though the link is not settled and many of these hips stay comfortable.

Why Your Hip Pinches During Everyday Movement

Joint shape sets the scene and movement supplies the trigger. Impingement is motion-related, so symptoms track with positions and loads:

Bending Deeply Into Squats and Lunges

Deep hip flexion brings the neck of the femur close to the front rim of the socket, which is where contact usually happens. Heavy squats, lunges, rowing and Olympic lifting all spend time in that range. The pinch often appears at a particular depth, and the same movement to a shallower depth may feel comfortable.

Sitting Low for Long Stretches

Prolonged sitting holds the hip in flexion, and low couches, bucket car seats and cycling saddles push it further. Many people notice a deep ache after a long drive or a day at a desk, then stiffness for the first few steps when they stand. Time in the position matters more than effort.

Rotating and Pivoting Under Load

Turning the thigh inward while the hip is bent is the classic provoking combination. Sports built on cutting, kicking and rapid changes of direction load the joint in exactly that position, including the football codes, netball, hockey and martial arts. Dance, gymnastics and some yoga positions push the hip towards its end range as well.

Repeating High Volumes of the Same Sport

Load tolerance counts as much as position. A hip that copes with two training sessions a week may complain at five, particularly during a pre-season block or after a jump in running distance. Symptoms that arrive soon after a training change often settle once the load is adjusted.

Symptoms Worth Paying Attention To

Hip impingement does not always announce itself as hip pain. Discomfort is often felt in the groin and described as pinching, catching or a deep ache:

Groin Pain With a C-Shaped Grip

Many people cup the side of the hip, thumb behind and fingers in front, when asked to show where it hurts. Clinicians call this the ‘C sign’, and it points to pain coming from inside the joint. Groin pain during or after activity is the symptom reported most often.

Stiffness and Lost Range of Motion

The hip may feel tight, especially when bending it up and turning it inward. Some people notice it first as difficulty putting on socks, sitting cross-legged or dropping into a squat that once felt easy. The restriction is often clearer on one side.

Mechanical Catching and Locking

Mechanical symptoms suggest something inside the joint is being caught, such as a labral tear or a loose fragment. Occasional painless clicking is common in healthy hips. Clicking that comes with pain, or a hip that briefly gives way, is worth having assessed.

Pain Referred to the Buttock or Thigh

Pain from the hip joint can be felt in the buttock, along the outside of the hip or down the front of the thigh towards the knee. Because of that spread, impingement is sometimes managed as a back problem or a groin strain for months before the hip itself is examined. Pain travelling below the knee, or pins and needles, points to other causes of hip pain and needs a different assessment.

How Hip Impingement Is Diagnosed

FAI syndrome is diagnosed only when several strands of evidence agree, a standard set out in an international consensus statement. Each strand carries different weight:

Symptom History

Where the pain sits, what brings it on, how long it has been there and what you need your hip to do all shape the assessment. A history of adolescent sport, a childhood hip condition or an earlier injury adds useful context. Sleep, work demands and how symptoms respond to rest complete the picture.

Physical Examination and Impingement Testing

Your practitioner will watch how you walk, how the hip moves and how the muscles around it perform. The flexion, adduction and internal rotation (FADIR) test is the most widely used, and reproducing your familiar pain in that position is a meaningful sign. It is a sensitive test without being a specific one, so a positive result is one piece of evidence, not a diagnosis.

X-Rays of the Pelvis and Hip

Standard views show the shape of the femoral head and neck, the depth and orientation of the socket, and how much joint space remains. Measurements such as the alpha angle, which describes the roundness of the femoral head, and the centre-edge angle, which describes socket cover, help quantify what is seen. X-rays also reveal existing arthritis, which strongly influences the treatment discussion.

Magnetic Resonance Imaging and Computed Tomography

Magnetic resonance imaging (MRI) shows soft tissue, including the labrum and cartilage, and is sometimes performed with contrast in the joint for a clearer view. Computed tomography (CT) gives detailed three-dimensional bone shape and is mainly used when a procedure is being planned. Neither scan replaces the examination.

Scan Findings Without Symptoms

Cam and pincer shapes turn up regularly in people with no hip pain, including athletes competing at a high level. A report describing impingement does not by itself mean the hip needs treatment. The term FAI syndrome is reserved for hips where symptoms, signs and imaging agree.

Non-Surgical Care Usually Comes First

For most people, guided non-surgical care is the starting point. An Australian randomised trial comparing physiotherapist-led management with hip arthroscopy found both groups improved over 12 months, with no clear difference in the cartilage measure used, while the surgical group reported greater symptom improvement. Deciding whether to see a physiotherapist or an orthopaedic surgeon first can feel confusing when pain has dragged on, and a structured program generally includes:

Adjusting Load and Provoking Positions

Short-term changes to the positions that reliably flare the hip give irritated tissue a chance to settle. That might mean reducing squat depth, raising a bicycle saddle, changing a seat or pausing one sport for a few weeks. These are temporary adjustments made while capacity is rebuilt, not permanent restrictions.

Building Hip and Gluteal Strength

Strong gluteal and deep hip muscles help control how the femoral head sits in the socket while you move. Programs commonly progress from controlled, low-range work into heavier loading as symptoms allow. Physiotherapists and exercise physiologists often share this stage, particularly where a return to sport or physical work is the goal.

Restoring Control Through the Trunk and Pelvis

How the pelvis tips and how the trunk sits over the hip changes the angle at which the joint is loaded. Retraining squat, lunge, landing and running mechanics can reduce how often the joint reaches its end range. Small technique changes sometimes ease symptoms more than added strength alone.

Considering Medication and Injections

Simple pain relief or anti-inflammatory medication may make early rehabilitation more comfortable, and any medication is worth discussing with your general practitioner (GP) or pharmacist. A guided injection into the joint is sometimes used, both to settle symptoms and to help confirm that the pain is coming from inside the hip. Injections are generally viewed as support for active treatment, not a treatment on their own.

Giving the Program Enough Time

Structured hip programs used in research have typically involved at least six supervised sessions across about 12 weeks, with further sessions over six months where needed. Improvement is usually gradual, and strength tends to lag behind pain relief. Reassessing at agreed points is more useful than judging progress week to week. These timeframes are a general guide only, and your own program may be shorter or longer depending on your circumstances.

When Surgery Enters the Conversation

Surgery is one option among several, and it is rarely decided on a scan alone. Several factors are weighed together:

Symptoms That Persist After Rehabilitation

A fair trial means a supervised, progressive program followed consistently for several months, not a handful of stretches. Where pain still limits work, sport or sleep after that, a specialist review is reasonable. A surgeon can explain what hip arthroscopy involves and whether your hip is likely to benefit.

Imaging That Matches Your Pain

A procedure targets a specific structural problem, so the findings need to explain the symptoms you have. Where the two do not line up, an operation is unlikely to solve the problem, and other sources of pain are worth exploring first.

Cartilage That Is Still in Good Condition

Joint-preserving procedures tend to be most useful before significant cartilage wear has developed. Where imaging shows advanced arthritis, keyhole surgery is generally not recommended and may not relieve that kind of pain, so a different pathway is usually discussed.

Demands That Your Hip Needs to Meet

A 24-year-old footballer and a 55-year-old with a desk job can have similar scans and very different plans. Your age, work, sport and the activities you want back all carry weight.

Expectations That Match the Evidence

Procedures for impingement generally aim to reshape the bone and repair or trim the labrum, with rehabilitation continuing for months afterwards. Outcomes vary with the amount of existing wear, the accuracy of the correction and how closely rehabilitation is followed. No procedure can guarantee a return to a particular sport or prevent arthritis, and your surgeon should set out the likely benefit alongside the risks for your hip.

Your Care Pathway in Australia

Knowing how the system fits together saves time and repeated appointments. The sequence is broadly consistent across Australia:

GP Assessment and Referral

A GP is usually the entry point. They can examine the hip, arrange initial imaging, discuss pain relief and refer you onward. A referral is generally required for Medicare to contribute towards a specialist consultation, and a standard GP referral to a specialist typically lasts 12 months.

Access to Physiotherapy and Exercise Physiology

Physiotherapy and exercise physiology can be booked without a referral, and are commonly paid privately or claimed through extras cover on private health insurance. Medicare support for allied health is limited to specific programs, so it is worth confirming what applies to you before committing to a course of treatment.

GP Chronic Condition Management Plans

On 1 July 2025, GP Management Plans and Team Care Arrangements were replaced by a single GP Chronic Condition Management Plan (GPCCMP). Under a GPCCMP, eligible patients with a chronic condition can access up to five subsidised allied health services in a calendar year, and referrals can be made using a standard referral letter. People who had a plan in place before that date can continue using it under transition arrangements until 30 June 2027.

Private Cover and Public Waiting Lists

Hip procedures in the private system attract separate fees from the surgeon, the anaesthetist and the hospital, and out-of-pocket costs vary with your policy and excess. In the public system there is no fee for the procedure, though waiting times for a non-urgent orthopaedic appointment and for surgery itself can be lengthy. Asking for an itemised estimate and checking your level of cover before committing avoids surprises.

Registered Practitioners and AHPRA

Physiotherapists, medical practitioners and specialist surgeons in Australia are registered with the Australian Health Practitioner Regulation Agency (AHPRA), and registration can be checked on the public register. Orthopaedic surgeons hold specialist registration and fellowship of the Royal Australasian College of Surgeons (RACS). Exercise physiologists are accredited through Exercise and Sports Science Australia (ESSA).

Questions Worth Asking at Your Appointment

A short list keeps a busy appointment focused on what matters to you. Consider asking:

• What is driving my symptoms, the bone shape, the labrum or something else?
• What could settle with rehabilitation alone?
• What would a realistic program look like over the next three months?
• What do my scan findings show about my symptoms?
• What are the risks and the likely recovery if surgery is considered?
• What changes should bring me back sooner?

Medicare arrangements, rebates and waiting times are a general guide only. They change over time and differ between states, so confirm current details with your GP, your health fund or the treating clinic.

Staying Active With Hip Impingement

Impingement is a hip shape you live with, and most people live well with it. The aim is a joint that handles what you ask of it:

Returning to Sport in Stages

Getting back usually means graded exposure, starting with low-impact work and progressing through running, change of direction and full training before match play. Clearance is based on strength, control and how the hip responds over the following days. Returning on a fixed date, without those checks, is the more common route back to a flare.

Setting Up Your Desk and Car

A seat that keeps the hips level with or slightly above the knees is usually kinder than a low, deep chair. Standing for part of the day, changing position every 30 to 40 minutes and adjusting the car seat before a long drive can all reduce that after-sitting ache.

Watching for Changes That Need Review

New locking, a hip that gives way, night pain that wakes you or symptoms worsening despite a sensible program are all reasons to be reassessed. Fever, or a sudden loss of movement after a fall, warrants prompt medical attention.

Living Without the Pinch

A pinching hip can feel like a warning about the years ahead, and that worry often weighs more than the pain itself. Knowing what is happening inside the joint, and that most hips settle with guided, progressive care, puts the next decision back in your hands.

You do not need to work this out alone or push through another season hoping it settles. MTP Health can assess how your hip moves, build a program around the activities you want back and involve a surgeon if the structure needs review. Speaking with your GP is an equally sound place to start.

Frequently Asked Questions (FAQs)

1. Can hip impingement go away on its own?

The bony shape itself does not change without surgery, although symptoms often settle. Adjusting load, strengthening the muscles around the hip and improving how you move brings many people back to comfort, and symptoms may stay quiet for years.

2. Is walking bad for a hip with impingement?

Walking is generally well tolerated, because it uses a middle range of hip movement and avoids deep flexion. Long walks on hills or uneven ground can be more provoking for some people. Pain that builds during or after a walk is worth raising at your next appointment.

3. How is hip impingement different from a labral tear?

Impingement describes the bone shapes and the early contact they cause. A labral tear is damage to the cartilage rim of the socket, which can be one consequence of that contact. The two often occur together, although a labral tear can also follow an injury in a hip with a normal shape.

4. Do I need a scan before seeing a physiotherapist?

Not usually. An assessment can identify the likely source of pain and start treatment, and imaging is arranged when it would change the plan. A physiotherapist at MTP Health can advise whether a scan would add anything useful.

5. Can both hips be affected?

Yes. Cam and pincer shapes are frequently present on both sides, even when symptoms begin on one. Treating the painful hip while building strength across both is a common approach.

6. Does hip impingement always lead to arthritis?

No. Cam morphology has been associated with a higher risk of hip osteoarthritis in some research, though many people with these shapes never develop arthritis or any symptoms. Current evidence does not confirm that treatment prevents arthritis, which is one reason decisions are based on the symptoms you have now.

Disclaimer: This article is general information only and does not take into account your personal circumstances, symptoms or medical history. It is not a substitute for individual medical advice. For guidance about your own hip, please speak with a qualified health professional such as your GP, physiotherapist or an orthopaedic surgeon.