After Hip Arthroscopy for FAI: When Rehab and NIR Support Should Start

A hip that jams at the bottom of a squat, or a groin ache that flares after a long drive or a deep lunge, usually points to one of two bone shapes at the hip joint, or both together. A cam lesion is a loss of the normal round contour where the femoral head meets the neck, a small bony bump that catches against the acetabular rim every time the hip bends and rotates inward. A pincer lesion is the opposite problem: the acetabulum covers the femoral head too far around its rim, so the joint edge takes a steady, grinding load instead of a sharp catch. In clinical practice, more than half of the hips that end up on an operating table show both patterns at once. Repeated contact of this kind wears down the labrum, the cartilage rim that seals the joint, and the adjacent articular cartilage, and it is one of the more common causes of hip pain and early-onset arthritis in young, physically active adults. Soccer, ice hockey, ballet, and martial arts show up disproportionately in case series, because all four demand deep hip flexion and rotation under load.

When physical therapy, activity changes, and injections stop being enough, hip arthroscopy reshapes the bony bump (an osteoplasty) and repairs the torn labrum through a handful of small portals rather than a large incision. That smaller footprint means less soft-tissue trauma than an open procedure, but the surgery itself only fixes the shape of the bone. It does not restore strength, movement control, or confidence in the joint. That happens over the following twelve weeks and beyond, through a rehab program that has to respect how the repaired tissue is actually healing, not just how the joint feels on a given day. What follows is the standard phase-based rehab sequence after combined cam and pincer arthroscopy with labral repair, along with where a near-infrared LED wellness device realistically fits into that process, and where it does not.

Why Impingement Happens, and Why Surgery Alone Isn't Enough

Picture the cam bump as a doorstop mounted slightly too high on a door. Every time the door, the femur, swings past a certain angle, the stop catches the frame, the acetabular rim, instead of clearing it. At the extremes of hip flexion and internal rotation, the position of a deep squat, a goalkeeper's dive, or simply sitting cross-legged on the floor, that catch drives shear force into the labrum, which over months and years peels it away from the bone the way tape lifts off a wall when you pull it at an angle rather than straight up. Pincer deformity works differently. Instead of a sharp catch, the over-covered rim delivers a constant, grinding compressive load along the joint edge every time the hip closes down, which tends to crush and fray the labrum rather than shear it. When both lesions are present, people often describe two distinct sensations: a sharp pinch at end-range positions, and a duller ache after a day spent mostly sitting.

Surgery Versus Physical Therapy: What the Trial Data Actually Shows

Griffin and colleagues ran the FASHIoN trial (Lancet, 2018), a multicenter randomized trial that split 348 patients with symptomatic FAI into an arthroscopy group and a personalized physical therapy group, then compared International Hip Outcome Tool (iHOT-33) scores at twelve months. The surgery group's average improvement was significantly larger, but here is the detail that tends to get lost when this trial is cited as a blanket case for surgery: the physical therapy group also improved substantially, just not by as much. That second finding matters for anyone reading this after their own operation. It confirms that a structured exercise program drives a large share of the recovery regardless of what happens on the operating table, which is exactly why the rehab plan below carries as much weight as the procedure itself.

Weak Glutes Don't Fix Themselves Just Because the Bone Is Reshaped

Casartelli and colleagues (Osteoarthritis and Cartilage, 2011) used an isokinetic dynamometer to compare hip flexor and abductor, mainly gluteus medius, strength between symptomatic FAI patients and pain-free controls, and found meaningfully lower output in the FAI group. The likely explanation runs two directions: pain-driven disuse, where the body simply stops loading a joint that hurts, and a genuine mechanical inefficiency built into the impinging joint itself, where the abnormal contact changes how the muscle gets recruited during gait. The practical takeaway is that correcting the bone's shape in surgery does not automatically retrain the gluteus medius to fire the way it should. That pattern has usually been present for months or years before the operation, and it needs its own dedicated strength work afterward. This is why nearly every serious post-arthroscopy protocol carves out gluteus medius, gluteus minimus, and deep rotator training as a separate category rather than folding it into general leg strengthening.

What's Actually Healing, Week by Week

A labral repair is mechanically stable the moment the anchors and sutures go in, but biological healing, the repair tissue actually integrating with bone, takes far longer than the fixation does. The repaired labrum and the reshaped bone surface pass through an early fibrous-healing phase that runs roughly through week six to eight, and during that window, aggressive flexion and internal rotation load the repair with tension it isn't ready to absorb. The capsulotomy, the cut made in the joint capsule to reach the joint, needs even longer, often several months, before it regains full mechanical strength. None of the phase restrictions below are arbitrary caution. They're built around this timeline, and skipping ahead of it doesn't speed recovery up. It just raises the odds of re-injuring tissue that was healing on schedule.

Where Near-Infrared Light Actually Fits, According to the Research

Photobiomodulation using red and near-infrared light has a real research base in sports medicine, mostly around easing exercise-induced muscle damage and supporting recovery between training sessions. Baroni and colleagues (Lasers in Medical Science, 2010) irradiated muscle with low-level laser before eccentric exercise and found a smaller rise in creatine kinase, a blood marker of muscle damage, compared to a control group. Vanin and colleagues (Brazilian Journal of Physical Therapy, 2018) pulled this literature together in a systematic review and meta-analysis and reported a generally positive trend for photobiomodulation on performance markers and recovery indicators. The catch, and it's an important one, is that almost all of this evidence comes from healthy muscle in athletes, not from surgically repaired joint tissue, and controlled trials applying near-infrared light directly to a healing labral repair or capsulotomy are still thin on the ground. That gap is exactly why a near-infrared LED device belongs in this recovery as a wellness tool for managing muscle fatigue around a training session, not as a treatment aimed at speeding healing at the surgical site itself.

Phase-Based Rehab and Where NIR Fits In

Rehab after hip arthroscopy generally runs through four phases, and the pace through each one shifts with how the tissue is actually healing and how much pain or swelling is still present. The table below outlines a typical progression for combined cam and pincer osteoplasty with labral repair, the case that calls for the most conservative timeline. Your surgeon and physical therapist have the final say on pace, and if pain or swelling lingers longer than expected, the rule is to hold at the current phase rather than push into the next one on a fixed calendar.

What Phase 1 Actually Looks Like Day to Day

Some surgeons still prescribe a continuous passive motion machine or a hip brace immediately after surgery, though the trend in recent years has shifted toward encouraging early active movement instead. Ankle pumps start the day of surgery to reduce the risk of deep vein thrombosis, and isometric contractions of the glutes and quadriceps are done in short, frequent sets throughout the day, staying inside whatever range pain allows. The goal here isn't strength. It's keeping the nervous system's connection to the muscle alive so it doesn't forget how to fire. Loading the muscle against real resistance this early does the opposite of helping; it transmits force through the joint capsule and repair site that they aren't ready to take.

How Load Should Progress Through Phases 2 and 3

Once mobility work begins, exercises that minimize axial load on the joint while still expanding range, a stationary bike, walking in a pool, take priority over anything performed on land against gravity. Resistance-band abduction and extension work should stay inside a pain-free range, with the number of reps per set increasing gradually. A common guideline caps that increase at roughly ten percent per week rather than jumping ahead just because a session felt easy. Once strengthening begins in earnest, the program shifts to closed-chain, weight-bearing work, bridges, step-ups, single-leg squats, and every time a single-leg exercise is introduced, it needs to be checked against the uninvolved side for strength symmetry, not just performed and forgotten.

Where People Go Wrong, and How to Correct It

The single most common mistake in this window is treating a good day as permission to skip ahead, sitting in a low chair or a car seat that pushes the hip past ninety degrees of flexion two weeks before that position is cleared, simply because it doesn't hurt to sit still. Pain during static sitting and pain during dynamic loading are not the same signal, and the joint often tolerates the former long before it's ready for the latter. A second frequent error is cutting the isometric glute work in Phase 1 short because it doesn't feel like it is accomplishing anything. People who skip this consistently show a slower return of hip abductor strength once Phase 3 arrives, because the neuromuscular pathway they needed to preserve went quiet in the meantime. A third mistake is measuring your own timeline against a friend's or a teammate's faster recovery. The amount of cartilage damage found at surgery and the extent of the labral repair vary enough between two people with the same diagnosis that timelines routinely differ by a month or more without either recovery being abnormal.

How to Know You're Ready for the Next Phase, and When to Pull Back

Moving from Phase 1 to Phase 2 generally calls for walking without a noticeable limp on flat ground, pain at rest under roughly 3 out of 10, and no visible swelling around the joint line. Moving into Phase 3 strengthening usually calls for full pain-free range of motion in flexion and rotation, plus the ability to perform the Phase 2 exercises without a flare the next day. The stop signs run the other direction: any new sharp pain during an exercise that wasn't there in the prior session, swelling that shows up within hours of a workout and hasn't fully settled by the next morning, or a sensation of catching or locking inside the joint. Any of those is a reason to drop back to the previous phase's loading and flag it for your physical therapist at the next visit rather than waiting for the next scheduled appointment.

Using NIR Light Around the Hip: The Practical Details

From Phase 2 onward, once the incision has fully closed with no redness or drainage, near-infrared LED can reasonably be applied to the muscles surrounding the hip: the glutes, the groin muscle group, and the tensor fasciae latae. For a device combining 660nm and 850nm wavelengths, a common wellness-use range is 10 to 15 minutes per session, held 5 to 10cm from the skin, three to five times a week. Many people find it works best as a routine right after a training session, using it to manage how the muscle feels heading into the next one rather than as a stand-alone treatment. No specific problems have been reported around retained suture anchors or hardware, but direct irradiation of the incision scar itself should wait until it has fully re-epithelialized, typically past the three-week mark. For a comparable conservative-care approach in a different joint, see our guide to Achilles tendinopathy and NIR.

Recovery Timeline: Function, Strength, and Return to Activity

Pain relief is the easiest thing to notice after hip arthroscopy, but it's a poor measure of actual recovery on its own. Strength, range of motion, and movement control tell a more honest story, and the tools below are the ones most rehab programs actually use to track them.

What These Measurements Actually Track

• iHOT-33 (International Hip Outcome Tool): A 33-item questionnaire spanning pain, sport and recreation, work and daily living, and social and emotional well-being. In the FASHIoN trial, the surgery group reported an average improvement of more than 20 points at twelve months.
• HOS (Hip Outcome Score), Activities of Daily Living and Sport subscales: Scores daily function and athletic function separately, each as a percentage.
• Isokinetic abduction and flexion strength: The Limb Symmetry Index, strength on the surgical side compared to the uninvolved side, reaching 90% or higher is one of the standard benchmarks used to help clear a return to sport.
• Single-leg squat and hop testing: Functional tests used from the later part of Phase 3 onward to check movement control and left-right asymmetry.
• Hip range of motion: Flexion, internal rotation, and external rotation angles are tracked at regular intervals to catch capsular tightness early, before it becomes a bigger problem to unwind.

What a Typical Recovery Curve Looks Like

Across post-arthroscopy rehab cohorts, a few patterns show up consistently. Swelling and pain with walking taper off gradually over weeks two through four, with crutch-free walking time increasing along the way. By around week six to eight, everyday movements such as climbing stairs and standing up from a chair are usually pain-free. Around the twelve-week mark, single-leg strength training can generally step up in intensity, and once strength ratios hit the benchmarks above, sport-specific training that includes direction changes can begin. Full return to non-contact sport typically takes four to six months, and contact sports or anything with heavy rotational demand often run past six months. These ranges vary meaningfully with an individual's tissue healing speed, how much of the joint was addressed surgically, and how consistently the rehab program was followed, so treat them as a reference point rather than a fixed deadline.

Signs Recovery Is Running Slower Than Expected

When recovery lags behind the typical timeline, the cause usually falls into one of three categories. The first is a compensation pattern that's become habitual, favoring the surgical hip to avoid pain long enough that a normal walking pattern is slow to return even once pain has faded. The second is insufficient gluteal activation, which shows up as a plateau once strengthening work begins; manual therapy or neuromuscular re-education is sometimes added at this point to break the pattern. The third is capsular adhesion limiting range of motion, which calls for your surgeon to re-evaluate and often adjust the intensity of range-of-motion work, sometimes alongside manual therapy. None of these three is something a near-infrared device resolves on its own. They call for a reassessment from your physical therapist before anything else changes.

Long-Term Joint Health After Arthroscopy

Most patients experience meaningful pain relief and functional recovery after arthroscopy, though the degree of cartilage damage already present at the time of surgery can mean long-term joint care stays part of the picture. Maintaining a healthy weight, keeping up gluteal and core strengthening well past the return-to-sport milestone, and limiting movements that repeatedly drive the hip into extreme flexion and internal rotation, a deep squat, a sharp pivot from a seated cross-legged position, are all associated with a lower risk of needing revision surgery. Follow-up evaluations at six months and one year, checking strength symmetry and any recurring pain, are worth keeping on the calendar even once things feel back to normal.

Precautions Through Recovery

Rehab Progression

• The crutch use and weight-bearing limits prescribed in Phase 1 protect the labral repair. Don't discontinue them early just because there's no pain; the repair can be intact and pain-free while still not ready for full load.
• Active internal rotation and deep flexion positions, including the bottom of a squat, carry a real risk of re-injuring the repair and stay restricted until your medical team clears them.
• If you've been prescribed medication to prevent heterotopic ossification, take the full course as directed rather than stopping once symptoms settle down.
• Deep groin pain, a locking sensation, or worsening night pain during rehab are reasons to contact your surgeon right away rather than waiting for the next scheduled follow-up.
• If your day requires long stretches of sitting, get up and walk or shift position periodically to keep the joint capsule from stiffening into an adhesion.
• Rather than pushing your own pace ahead of schedule, base the decision to advance a phase on whether you can perform the current phase's exercises reliably without pain, and confirm that with your physical therapist before moving on.

Fitting Recovery Into an Ordinary Day

Most of the friction in early recovery shows up in ordinary moments, not during formal exercise sessions. Getting in and out of a car is a common one: lead with the surgical-side leg going in, sit first and swing both legs together rather than twisting at the hip, and raise the seat if your car allows it so you're not settling into deep flexion. At a desk, a chair with a slightly reclined seat back and a seat height that keeps your hips at or above knee level avoids the sustained deep-flexion position that a standard low office chair puts you in for hours at a time, worth arranging before you're back at work rather than after the hip starts complaining. For sleeping, side-lying with a pillow between the knees keeps the joint in a neutral, unrotated position; stomach-sleeping tends to rotate the hip into a position the repair doesn't need in the first few weeks. If your routine involves carrying a child, use a hip carrier or sling that shifts the load, and avoid the low squat with wide hip external rotation that comes naturally when picking a toddler up off the floor. A half-kneeling position is a reasonable substitute for the first couple of months.

When to Seek Medical Attention Right Away

A short list of symptoms should move you off the standard rehab timeline and into a call to your surgeon's office the same day. Fever or chills, spreading redness or warmth around the incision, or drainage that looks cloudy or increases rather than tapers off, all point toward a possible infection. Calf swelling or pain, especially if it's one-sided, needs to be checked for a blood clot rather than assumed to be muscle soreness. New numbness, tingling, or weakness running down the leg, different from the expected dull ache around the hip, can signal nerve irritation and is worth a call rather than a wait-and-see approach. Night pain that wakes you up and isn't tied to how you're lying, or pain that keeps building instead of gradually easing over the weeks, is also worth flagging, as is any unexplained weight loss alongside ongoing hip pain, since that combination points toward something outside a standard post-surgical recovery and warrants a closer look.

Using the NIR LED Device

• Skip direct irradiation over the incision scar until it has fully closed, meaning no redness, drainage, or scabbing remaining.
• Never point the device directly at the eyes; protective goggles are recommended.
• If you're taking a photosensitizing medication, tetracycline-class antibiotics and amiodarone are common examples, check with your prescribing physician before starting.
• Pregnant users should avoid irradiating the abdomen, and anyone with a history of active malignancy should discuss use over that area with their care team first.
• The device supports muscle conditioning as a wellness tool. It is not a medical device for treating the surgical site or managing pain directly, and every judgment about how rehab is progressing should come from your orthopedic surgeon and physical therapist.
• If reduced skin sensation from a condition like diabetes makes it harder to notice early signs of a burn, keep the distance and session length conservative and check the skin regularly.

Following a structured, phase-based progression, with near-infrared LED use kept to its proper supporting role, gives most patients a fairly predictable path through recovery after cam and pincer FAI arthroscopy. Tissue healing speed and the extent of surgical correction differ from person to person, though, so treat this protocol as a general reference and defer to your own medical team's individualized guidance for the specifics of your case.