Hip Impingement and FAI

 

Hip Impingement (FAI) Treatment in Princeton and Lawrenceville, NJ

Hip impingement, also called femoroacetabular impingement or FAI, is a common cause of pain in the front of the hip or groin. It often shows up in active adults, runners, lifters, and athletes who do a lot of squatting, pivoting, cutting, or repetitive hip flexion.

Many people describe hip impingement as a pinching feeling in the front of the hip. Others notice groin pain with deep squats, sitting too long, getting in and out of a car, uphill running, or sports that involve rotation and change of direction. Some feel stiffness first. Others feel pain only when training gets heavier.

The good news is that many people improve without surgery. The key is not just identifying that the hip is irritated. The key is understanding which positions, loads, and movement patterns keep driving symptoms, then building a plan that improves strength, control, and tolerance to activity.

Quick takeaways

• Hip impingement FAI commonly causes front-of-hip or groin pain
• Deep hip flexion, squatting, pivoting, and sitting can aggravate symptoms
• FAI does not automatically mean surgery
• Many people improve with activity modification and progressive rehab
• Hip strength, trunk control, and load management usually matter
• The best return plan depends on symptoms, function, and sport demands

At Princeton Sports and Family Medicine, P.C., PSFM Wellness, and Fuse Sports Performance, we don’t believe in guessing your way through training. We believe in building resilient, durable athletes who arrive at race season strong, confident, and healthy. In addition to problem-focused visits, we offer sports performance evaluations to stop problems before they start. Plan your visit today.

WHO THIS AFFECTS + WHY IT HAPPENS

Hip impingement FAI can affect:

• Runners
• Lifters
• Soccer, hockey, lacrosse, and football athletes
• Dancers and rotational athletes
• Active adults who squat, lunge, or climb often
• People with recurring groin pain or hip pinching during exercise

FAI refers to a situation where the ball and socket of the hip do not move together as comfortably in certain positions, especially with deep flexion and rotation. That can irritate structures in and around the hip joint and create pain with repeated loading.

This does not mean the hip is “damaged beyond repair,” and it does not mean every person with imaging findings will have symptoms. Many people have structural findings on imaging without pain. Symptoms usually matter most when those findings match the history, exam, and movement pattern.

Risk factors

• Repetitive deep hip flexion
• Sports with cutting, pivoting, and rotation
• Heavy squatting or lifting volume
• Limited hip mobility
• Hip and trunk strength deficits
• Poor tolerance to rapid training changes
• Prior hip or groin pain
• Stiffness with sitting and activity transitions

SYMPTOMS + WHAT’S NORMAL VS NOT

Typical symptoms

• Pain in the front of the hip or groin
• A pinching sensation with deep squat or hip flexion
• Pain with pivoting, cutting, or twisting
• Stiffness after sitting
• Pain getting in or out of a car
• Discomfort with uphill running or stairs
• Reduced hip mobility
• Clicking or catching in some cases
• Symptoms that flare with heavy leg training

Some people mainly notice stiffness and loss of motion. Others feel sharper groin pain with certain positions. Symptoms may build gradually or become more obvious as training intensity increases.

Seek urgent care now if…

• You cannot bear weight
• Pain follows a significant fall or trauma
• The hip feels deformed or unstable
• You have fever, significant redness, or signs of infection
• Pain is severe and rapidly worsening
• You have new numbness, significant weakness, or other neurologic symptoms
• There is concern for fracture or major injury

DIAGNOSIS

Hip impingement FAI is diagnosed through a combination of history, physical exam, and sometimes imaging. The story matters. Front-of-hip or groin pain with deep flexion, rotation, squatting, or prolonged sitting often fits this pattern.

At a visit, assessment may include:

• Exact pain location
• Which positions or activities provoke symptoms
• Hip range of motion
• Pinching with flexion and rotation
• Strength of the hip, pelvis, and trunk
• Single-leg control
• Gait or sport-related movement assessment
• Whether symptoms suggest another cause of hip or groin pain

Imaging may be considered when the diagnosis needs clarification, when symptoms are not improving, or when results would meaningfully affect next steps. Imaging findings need to be interpreted in context, because not every structural finding is the main reason for pain.

What to expect at your visit

• Review of symptom pattern, training, and aggravating positions
• Focused hip, pelvis, and movement exam
• Discussion of whether symptoms fit FAI or another hip-related issue
• Guidance on activity modification
• A stepwise rehab and return-to-activity plan

TREATMENT OPTIONS

Many people with hip impingement FAI improve with non-operative care.

Self-care basics

Helpful early strategies often include:

• Reducing repeated pinching positions
• Temporarily modifying deep squat volume
• Limiting movements that predictably flare the front of the hip
• Using relative rest instead of complete shutdown
• Gradually reloading once symptoms become less irritable

What to avoid:

• Repeatedly training into sharp pinching pain
• Forcing mobility aggressively into painful positions
• Assuming rest alone will solve the whole problem
• Returning to full lifting or sport volume too quickly
• Ignoring strength and control deficits

Rehab / PT focus

Rehab often emphasizes:

• Activity and load modification
• Hip strength
• Glute strength
• Trunk and pelvic control
• Improved movement strategy
• Gradual reintroduction to squatting, running, or sport tasks
• Single-leg control
• Rotational tolerance
• Better tolerance to daily positions like sitting and stairs

The goal is not just to “open up the hip.” The goal is to help the athlete move and load the hip better.

Medications

Over-the-counter pain relievers may sometimes help short-term symptoms, but they do not fix the underlying loading issue. Medication choices depend on the individual and medical history, so ask your clinician what is appropriate.

Injections / procedures

These may be discussed in select cases, especially when pain is persistent or the diagnosis needs clarification, but they are not the starting point for every person with hip impingement symptoms.

Surgery

Some people with ongoing symptoms, clear structural contribution, and limited improvement after a strong course of rehab may be referred for surgical discussion. Surgery is not automatically required just because FAI is suspected or seen on imaging.

RETURN TO SPORT / ACTIVITY GUIDANCE

Return should be based on symptom response and function, not just time.

Early phase

Goals: calm irritation and reduce pinching with daily activity

Allowed activities may include:

• Walking within tolerance
• Modified strength work
• Low-irritation cross-training
• Controlled mobility that does not provoke sharp pinching
• Reduced-depth squat or hinge patterns

Mid phase

Goals: rebuild strength, improve control, and expand tolerated range

Allowed activities may include:

• Progressive hip and glute strengthening
• Single-leg work
• Trunk and pelvic control drills
• Modified squat progression
• Gradual return to jogging if appropriate

Late phase

Goals: restore higher-level strength and sport tolerance

Allowed activities may include:

• Full lower-body strength progression
• Cutting and rotation drills when appropriate
• Running progression
• Sport-specific field or court work
• Return to heavier training or competition

Common mistakes to avoid

• Forcing deep positions too early
• Chasing mobility only without rebuilding strength
• Returning to heavy squats before symptoms tolerate it
• Ignoring groin or front-of-hip pain because it is “not severe”
• Advancing volume and intensity at the same time
• Assuming imaging alone determines readiness

PREVENTION

Helpful prevention strategies include:

• Progress lower-body training gradually
• Respect changes in volume, intensity, and depth
• Build hip and glute strength consistently
• Improve trunk and pelvic control
• Avoid living only at the deepest painful ranges
• Address recurring front-of-hip pinching early
• Use gradual return after time off or prior flare-up
• Build tolerance to sport-specific rotation and change of direction

For athletes whose symptoms show up during running, cutting, or other performance tasks, broader movement and load assessment may be helpful. Athletes working on performance progression may also transition into structured training at Fuse Sports Performance.

HOW WE HELP / SERVICES CONNECTION

Hip impingement FAI usually improves best when the treatment plan matches both the irritated hip and the athlete’s real-world demands. That may mean changing squat depth temporarily, addressing hip and trunk strength, improving single-leg control, and building a more realistic return-to-sport sequence.

At PSFM Wellness, Fuse Sports Performance and Princeton Sports and Family Medicine, P.C., our professionals specialize in sports medicine services, including sport specific evaluations and training to assess your risk for injury and assist in your performance goals.

For runners with hip-related symptoms during stride, a Run Stride and Performance Evaluation may help connect symptoms to loading mechanics and pelvic control. In athletes where performance, workload, and conditioning are part of the larger picture, broader testing such as VO2max & Lactate Testing or Basal Metabolic Rate may also fit into the discussion.

FAQs

What is hip impingement FAI?

Hip impingement FAI stands for femoroacetabular impingement. It describes a situation where the ball and socket of the hip do not move together comfortably in certain positions, which can lead to front-of-hip or groin pain.

Where does hip impingement usually hurt?

Most people feel pain in the front of the hip or groin. Some also notice stiffness, catching, or pain with deep squat, sitting, or rotation.

Is hip impingement the same as a labrum tear?

Not exactly. They can overlap. Some people with FAI also have irritation involving the labrum, but they are not the same diagnosis.

Do I need imaging?

Not always. Many people can start with history, exam, and a good rehab plan. Imaging is more useful when the diagnosis is unclear or the results would change next steps.

Should I stop lifting?

Usually not completely. Many people can keep lifting with modification. The goal is to reduce the positions and loads that keep pinching the hip while rebuilding strength safely.

When can I run again?

That depends on how the hip tolerates loading. Some people return to jogging fairly early, while higher-speed running or hills may need to wait until strength and symptoms improve.

Can FAI get better without surgery?

Yes. Many people improve with activity modification, strength work, and better load management. Surgery is not the automatic answer for every painful hip with FAI findings.

Why does sitting make it worse?

Sitting keeps the hip in a flexed position. For some people with FAI, repeated or prolonged flexion increases front-of-hip irritation and stiffness.

Is stretching enough?

Usually not. Mobility work may play a role, but stretching alone rarely solves the problem. Most people need strength, movement modification, and progressive loading too.

Can runners in Princeton or lifters in Lawrenceville develop FAI symptoms?

Yes. Runners in Princeton and lifters in Lawrenceville can both develop hip impingement symptoms because repeated hip flexion, training load, and movement strategy all matter.

What if I hear clicking in the hip?

Clicking can happen for more than one reason. Sometimes it is benign. Sometimes it is part of a broader hip issue. The full history and exam help determine whether it matters.

Is hip impingement the same as hip arthritis?

No. Hip arthritis and FAI are different problems, though some symptoms can overlap. Stiffness and groin pain may be present in both, which is why the exam matters.

RELATED PAGES

• Hip pain — https://www.princetonmedicine.com/contents/hip-pain  
• Hip labrum tear — https://www.princetonmedicine.com/contents/hip-labrum-tear  
• Tight hip flexors — https://www.princetonmedicine.com/contents/tight-hip-flexors  
• Hip bursitis — https://www.princetonmedicine.com/contents/hip-bursitis  
• Hip arthritis — https://www.princetonmedicine.com/contents/hip-arthritis  
• Groin strain — https://www.princetonmedicine.com/contents/groin-strain  
• SI joint pain — https://www.princetonmedicine.com/contents/si-joint-pain  
• Sports performance testing — https://www.princetonmedicine.com/contents/sports-performance-testing  

Contact Princeton Sports and Family Medicine, P.C., at our Lawrenceville office. Book an appointment online or call us directly to schedule your visit today.

DISCLAIMER

This page is for educational purposes only and is not medical advice. Front-of-hip and groin pain can have more than one cause. Severe pain, inability to bear weight, major trauma, deformity, fever, or other red-flag symptoms need prompt medical evaluation.