Femoroacetabular Impingement (FAI)
In Singapore

Hip pain limiting your daily activities or sports performance? Femoroacetabular impingement (FAI) is a common yet often misdiagnosed condition that affects many active individuals in Singapore. This mechanical hip disorder can significantly impact your mobility and quality of life if left untreated. A timely assessment may provide clarity on the type of hip condition and the management strategies that could be considered.

Dr Zackary Chua

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (Aus)MMed (SG)MRCS (Glasgow)FRCSEd (Orth)

Types Causes & Risks Symptoms When to see a Doctor Diagnosis Treatment Complications Prevention FAQ Conclusion

What is Femoroacetabular Impingement (FAI)?

Femoroacetabular impingement occurs when abnormal bone growth causes friction between the hip ball (femoral head) and socket (acetabulum) during movement. This repeated contact can damage the protective cartilage and labrum, leading to pain and restricted hip motion. FAI is commonly seen in athletes and active individuals aged 20-40, though symptoms can develop at any age. In Singapore’s active population, FAI has become increasingly recognised as a cause of hip pain in younger adults. The condition often develops gradually, making early diagnosis crucial for preventing long-term joint damage.

Types of Femoroacetabular Impingement

Cam Impingement

Cam impingement arises from an abnormal bump or ridge on the femoral head-neck junction, which can prevent smooth rotation within the hip socket. It is more frequently observed in young athletic males and may result from repetitive hip flexion during adolescent growth years.

Pincer Impingement

Pincer impingement occurs when the acetabulum (hip socket) has excessive coverage over the femoral head. This overcoverage causes the labrum to be compressed between the bones during hip movement. Pincer lesions are more common in middle-aged women and athletic females.

Combined Impingement

Many individuals present with both cam and pincer morphology, featuring abnormalities in both the ball and socket. This requires comprehensive evaluation to determine which component contributes more significantly to symptoms.

Causes

Abnormal hip development during childhood growth spurts
Genetic variations affecting hip shape or structure
Repetitive hip flexion activities during skeletal development
Previous hip conditions like Legg-Calve-Perthes disease
Slipped capital femoral epiphysis (SCFE) during adolescence

Risk Factors

Participation in high-impact sports (e.g., football, martial arts, dance)
Activities requiring extreme hip range of motion
Family history of hip problems or early arthritis
Male gender (more commonly associated with cam-type impingement)
Female gender (more commonly associated with pincer-type impingement)
Sitting positions requiring deep hip flexion
Occupations involving frequent squatting or bending

Signs & Symptoms

Early Stage

Groin pain after prolonged sitting or driving
Stiffness when standing up from a seated position
Mild discomfort during or after physical activities
Clicking or catching sensation in the hip
Difficulty with deep squatting or sitting cross-legged

Advanced Stage

Sharp groin pain with hip flexion or rotation
Pain radiating to thigh or buttock region
Significant limitation in hip range of motion
Night-time pain affecting sleep quality
Inability to participate in sports or exercise
Lower back discomfort from changes in movement

Late Stage

Constant hip pain even at rest
Severe movement restrictions affecting daily activities
Early osteoarthritis changes visible on imaging
Muscle weakness f due to prolonged avoidance of movement
Altered gait patterns to minimise hip motion

FAI symptoms typically worsen gradually over months to years. Early signs are sometimes mistaken for muscle strains or overuse injuries, which may delay evaluation and management.

Experiencing these symptoms?

If you notice pain during sports, exercise, or daily movement, a timely review can help explain your symptoms and guide safe management approaches.

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When to See a Doctor

Seek prompt medical evaluation if you experience sudden severe hip pain, inability to bear weight, or hip deformity following trauma. These symptoms may indicate acute injury requiring urgent attention. Consider consulting a hip pain specialist singapore for persistent groin pain lasting more than six weeks, stiffness affecting daily activities, or recurring pain during sports or physical activity.

During your first consultation, our orthopaedic surgeon will conduct a comprehensive hip examination, including specific impingement tests, and ask about the onset of symptoms, aggravating activities, and any limitations in function. Early intervention prevents progressive cartilage damage and development of secondary osteoarthritis.

Diagnosis & Testing Methods

Clinical Examination: Diagnosis of FAI begins with a thorough clinical examination. Specific provocative tests, such as the anterior impingement test (FADIR) and posterior impingement test, may be performed to reproduce symptoms by placing the hip in positions that create bony contact.
X-rays: X-rays remain essential for identifying bone abnormalities. Standard views include anteroposterior (AP) pelvis, lateral hip, and specialised views like Dunn view to detect cam lesions. These images reveal bone shape abnormalities and early arthritis changes.
MRI Arthrography: MRI arthrography involves injecting contrast into the hip joint before scanning. This imaging accurately detects labral tears, cartilage damage, and subtle bone abnormalities that may not appear on standard X-rays.
CT Scans: CT scans offer three-dimensional bone assessment for complex cases. This imaging helps surgical planning by providing precise measurements of bone deformities and determining resection areas during surgery.

Treatment Options Overview

Conservative Management

Physiotherapy is generally the first approach for mild FAI cases. Programmes focus on improving hip mobility, core strengthening, and modifying movement patterns. Activity adjustments are suggested to avoid positions that exacerbate impingement while maintaining overall fitness. Treatment typically spans 3-6 months with regular progress reviews.

Activity Modification

Temporary cessation of aggravating activities allows inflammation reduction Sport-specific recommendations may be provided to maintain fitness safely. For example, swimmers may modify stroke techniques, and runners may switch to low-impact exercises such as cycling or using an elliptical trainer.

Injection Therapies

Intra-articular corticosteroid injections provide diagnostic and therapeutic benefits. Ultrasound-guided injections ensure accurate medication placement within the joint. Symptom relief typically lasts 3-6 months and may inform decisions about further treatment approaches.

Hip Arthroscopy

Minimally invasive arthroscopic surgery can address bone abnormalities and soft tissue damage. Small incisions allow reshaping of cam lesions at the femoral head-neck junction and trimming of pincer lesions at the acetabular rim. Labral repair or reconstruction may also be performed if soft tissue is affected.

Open Surgical Dislocation

For complex cases, open surgery may be considered to allow comprehensive correction of deformities. This approach provides full visualisation of the hip joint while preserving blood supply to the femoral head. Recovery is typically longer than with arthroscopy.

Periacetabular Osteotomy

In cases with significant acetabular dysplasia alongside FAI, pelvic osteotomy may be recommended. This procedure reorients the hip socket to reduce impingement and improve joint coverage. It is usually considered in younger patients with specific anatomical patterns to support long-term joint function.

Experiencing persistent hip pain or stiffness?

Early evaluation by an orthopaedic specialist can help identify the cause and outline possible management options.

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Complications if Left Untreated

If left unaddressed, FAI can lead to progressive damage to the hip labrum and cartilage due to repeated abnormal contact between the femoral head and acetabulum.

Persistent hip discomfort can also affect overall movement patterns. Individuals may unconsciously adjust the way they walk, run, or perform daily activities, which can place additional strain on the lower back, opposite hip, and knees. These secondary issues may continue even after hip treatment.

In advanced cases, significant joint degeneration may eventually require hip replacement at a younger age. While hip replacement surgery is generally effective, implants have a limited lifespan and may require revision in the future. Early assessment and management of FAI can help address symptoms before more significant joint changes occur.

Prevention

While the underlying bone shape associated with FAI cannot be prevented, the development of symptoms can often be delayed or minimised through targeted strategies. Young athletes should avoid early sport specialisation and incorporate cross-training to prevent repetitive stress during growth years.

Correct movement patterns and proper technique in sports that involve hip flexion can help reduce impingement stress, while regular flexibility exercises focusing on hip external rotation and extension support balanced joint mechanics.

Core strengthening provides dynamic hip stability, reducing reliance on passive bony constraints. Low-impact activities such as pilates and yoga helps maintain mobility without placing excessive stress on the hip. Maintaining a healthy body weight also reduces joint loading during daily activities and sports, supporting long-term hip function.

Femoroacetabular Impingement (FAI)

Frequently Asked Questions

Can FAI be treated without surgery?

Many patients with mild to moderate FAI successfully manage symptoms through non-surgical approaches. Physiotherapy, activity modification, and occasional injections may provide adequate relief for some individuals. Surgery is generally considered when there are significant bone deformities or if conservative measures do not adequately address symptoms.

How long is recovery after hip arthroscopy for FAI?

Recovery depends on the procedure’s extent and individual factors. Crutches are commonly used for 2–4 weeks, with supervised rehabilitation beginning soon after surgery. Most patients can return to desk-based work within 2–3 weeks, while full participation in sports may take 4–6 months. Recovery timelines vary and should be discussed with a specialist based on the specific procedure.

Will FAI come back after treatment?

Surgical correction of bone abnormalities addresses the structural cause of impingement, making recurrence of the same anatomical issue unlikely. Maintaining hip flexibility, strength, and appropriate activity levels is important to reduce the risk of symptoms returning due to muscle imbalances or scar tissue.

Can I continue sports after FAI treatment?

Many patients are able to return to sports following appropriate management. Recovery may include gradual resumption of activities, technique modification, or avoidance of positions that provoke symptoms. High-impact athletes might transition to lower-impact activities for long-term joint preservation. Safe participation in sports is planned according to your hip anatomy and performance goals.

Is FAI hereditary?

Genetic factors can influence hip morphology development. Children of parents with FAI have increased likelihood of similar bone shapes. However, symptoms depend on activity levels and other factors beyond anatomy alone. Awareness of family history can support early monitoring and management.

What is the success rate of FAI surgery?

Surgical outcomes depend on multiple factors including age, extent of existing damage, and procedure type. Younger patients with isolated FAI and minimal arthritis achieve positive outcomes. Our orthopaedic surgeon will discuss realistic expectations based on your individual circumstances during consultation.

Conclusion

Femoroacetabular impingement (FAI) is a recognised cause of hip pain that can affect daily activities and sports participation. Early evaluation and appropriate treatment prevent progressive joint damage and preserve long-term hip function. Whether through conservative management or surgical intervention, effective treatments exist to address FAI symptoms and return patients to their desired activity levels. Understanding your condition empowers informed decision-making about treatment options.

Concerned about hip pain limiting your performance?

Early assessment can help clarify the underlying cause and inform a personalised approach to symptom management.

Book Your Consultation Today

Dr Zackary Chua (蔡克祥医生)

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (AUS)|MMed (Singapore)|MRCS (Glasgow)|FRCSEd (Orth)

A senior consultant orthopaedic surgeon with dual specialisations in Foot & Ankle Surgery and Paediatric Orthopaedics. Backed by his extensive years of training and experience, Dr Chua brings the necessary knowledge and skills to ensure a smooth recovery journey.

Rooted firmly by two fundamental philosophies: “When one’s feet hurt, one hurts all over” and “Children are not little adults”, Dr Chua’s approach to patient care reflects his compassionate care for adults and children.

Singhealth Quality Excellence Award – Silver (2011)
Service From the Heart Award (2021)
Singapore Health Quality Service Award – Gold (2023)
NUS Medicine Dean’s Award for Teaching Excellence (2023)

His active participation in the medical community extends to mentoring, research supervision, and contributions to key professional forums and symposiums, both locally and internationally.