Femoroacetabular Impingement (FAI) and Hip Labral Tear Guide
Femoroacetabular impingement (FAI) and hip labral tears are problems of hip shape and the tissue that seals the joint — not automatically problems that require surgery.
What Is It?
Your hip is a ball-and-socket joint. For it to move freely, the ball must be round, and the socket must cover it - not to little, not too much. FAI happens when one of those isn't true, and the ball and socket collide at the edges of motion.
In CAM shape, extra bone where the ball meets its neck shears the cartilage way from the labrum as the hip bends.
In PINCER shape, the socket over-covers the ball, so the rim crushes the labrum early. Many hips have elements of both.
The labrum itself seals the joint - pressing against the ball to see fluid pressurized, which spreads load and helps hold the ball in place. When shape and seal are both compreomised, symptoms follow.
Why Does It Happen?
There's usually no single injury. Cam shape appears to develop during adolescence, particularly with high volume of athletic activity while the growth plate is still open. The shape is generally set by skeletal maturity and doesn't progress much afterward. Symptoms show up later, once accumulated contact has produced enough tissue damage.
Most labral tears follow the same pattern - not a one-off injury, but the downstream result of that abnormal contact over years. Less often, a tear follows a discrete event like a fall, a dislocation, or a violent twist, or develops in hips with shallow sockets or hyper mobility. In those cases, the labrum carries more than its share of the stabilizing load.
Common Symptoms
The classic complaint is deep groin pain, often described by cupping a hand around the front and side of the hip. It's worse with deep bending - sitting, driving, getting out of a low car, squatting - and with the specific movements of your sport. Many people notice stiffness, a sense the hip can't go where it used to, and sometimes catching, clicking, or a feeling that the hip isn't reliably stable. Symptoms usually build over months, with no clear starting point.
Hip pain in a young, active adult is one of the most frequently misread problems in sports medicine. People are told it's a groin strain that won't resolve, a hip flexor that won't respond to stretching, or that the hip is just ight. Often they've struggled for a year or more before anyone names what's actually happening.
How Is It Diagnosed?
We start by figuring out whether your symptoms are actually coming from the hip joint, or from the back or pelvis instead — the two are easy to confuse. In the exam, we check how your hip moves and try to reproduce that familiar groin pinch, which helps confirm the joint as the source. We also look at your gait, your stance, and your overall strength.
Imaging starts with X-rays, which show bone shape. MRI follows for a closer look at the labrum and cartilage. If the picture is still unclear, a numbing injection into the joint is the most useful next step: real relief points to the hip as the source; little or no relief means we look elsewhere.
How Do We Think About Treatment?
Rehabilitation First
For most people, the first step is a genuine trial of structured physiotherapy — not a waiting period, but treatment in its own right. The goal is dynamic stability: building the hip strength and core control that help compensate for the instability the labrum can no longer fully manage on its own. It targets hip mechanics, correcting movement patterns, and learning which positions provoke impingement. It's not just stretching, and it's not rest.
Activity modification and short courses of anti-inflammatory medication can support the process. A single image-guided injection can help when pain is blocking meaningful participation in rehab — the injection enables the rehabilitation; it doesn't replace it.
Surgical Repair
Hip arthroscopy is a minimally invasive procedure — performed through small incisions with a camera and specialized instruments, rather than an open approach. It addresses the shape and the tissue in the same operation: reshaping the ball-neck junction, trimming excess socket rim, and repairing or reconstructing the labrum to restore the seal.
For the labrum, we preserve tissue whenever possible. Repair reattaches it to the rim. Reconstruction uses a graft when the native tissue can't be saved. Trimming is reserved for tissue that won't support either.
When Is Surgery the Right Choice?
Not because your X-ray shows cam or pincer shape, or your MRI mentions a labral tear. Both are common in people with no symptoms at all.
Surgery makes sense when your symptoms, exam, and imaging all agree that FAI — with or without a labral tear — is genuinely the source of your pain; a real course of structured physiotherapy hasn't restored the function you need; the joint surface is well preserved, so preserving the hip makes sense; the shape can be corrected at the same time as the labrum, so the repair isn't loaded by the same mechanism that tore it; and your goals justify the recovery, with realistic expectations about what improvement looks like.
Recovery
Two clocks run after hip arthroscopy, and they run at different speeds.
The first is healing. The labrum and the reshaped bone need time to settle into their new position and mature — a process that unfolds over three to twelve months. A repaired labrum may lose a little of its original shape along the way as it remodels, without that affecting the outcome.
The second is strength, and it lags well behind. Most muscle groups around the hip recover by two to four months. Hip flexion is the outlier — it often stays weaker than the other side at four months, and can still trail at six.
Most pain improvement happens in the first three months. Function keeps improving through six months to a year, with return to sport the last thing to arrive. Surgery is not a perfect fix — it doesn't return every hip all the way to normal. But most people get substantially better, and that improvement continues to build well past the early recovery period.
Return to Sport
Typical timelines after labral repair with FAI correction: sedentary work around two to six weeks, running around three to four months, golf around four to six months, and pivoting sport around four to seven months — often longer for cutting athletes.
These are floors, not fixed dates. Before clearing higher-demand activity, we look for full motion, no swelling, adequate strength symmetry, and demonstrated control in the positions that used to provoke symptoms.
Common Questions
Did I cause this?
No. Cam shape tends to develop during adolescence, often influenced by high volume athletic activity while the growth place is still open. It formed years before your symptoms did - it isn't the result of anything you did wrong.
My X-ray shows FAI. Doesn't that mean that's my diagnosis?
Not by itself. CAM and pincer shapes are common in people with no hip pain at all. FAI syndrome requires your symptoms, exam, and imaging to all agree - not just one finding on a scan.
Will surgery make my hip completely normal?
Most people improve substantially. Fewer reach a hip that feels entirely back to normal. Both are true, and we'd rather you hear that going in than be surprised by it later.
Do I need surgery to avoid arthritis down the road?
There's no direct evidence that reshaping the hip prevents arthritis. The link between hip shape and arthritis is population-level. It isn't a prediction about what will happen to you specifically.
What Happens Next?
If this is a new diagnosis, we begin structured physiotherapy focused on hip strength and mechanics, with a clear point to check back in. If your symptoms, exam, and imaging don't clearly agree — or your pain could be coming from your back or pelvis — a diagnostic injection may come first, to confirm where the pain is really coming from.
If symptoms persist despite a genuine rehabilitation effort and your joint surface is well preserved, we'll talk through arthroscopy — with honest expectations about what it can and can't do.