Patellar Instability Treatment in Singapore

If your kneecap frequently shifts out of place or feels unstable, you may be experiencing patellar instability. This condition can affect mobility, confidence and quality of life — making even routine activities like walking or climbing stairs challenging. At our orthopaedic clinic in Singapore, our Senior Consultant Orthopaedic Surgeon offers a thorough assessment and evidence-based treatment plans to support knee stability and function, helping you to get back to your active lifestyle.

Dr Zackary Chua

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

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

Patellar Instability Treatment in Singapore

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

What is Patellar Instability?

Patellar instability occurs when the kneecap (patella) moves abnormally within its groove at the front of the thighbone (femur). It ranges from mild subluxation, where the kneecap partially shifts but returns to position, to complete dislocation requiring manual repositioning. The patella normally glides smoothly in the trochlear groove during knee movement, held in place by ligaments, muscles, and bone anatomy. When these stabilising structures are compromised, the kneecap becomes prone to shifting laterally (toward the outside of the knee).

Types of Patellar Instability

Acute Patellar Dislocation

A sudden, traumatic event where the kneecap completely moves out of its normal position. It often occurs during sports activities involving sudden direction changes or direct impact to the knee. First-time dislocations often result in significant pain, swelling, and immediate inability to bear weight on the affected leg.

Recurrent Patellar Subluxation

In this type, the kneecap repeatedly shifts partially out of position but spontaneously returns. Patients often describe a feeling of the knee “giving way” or being unreliable. This recurring instability can develop after an initial dislocation or due to underlying anatomical factors.

Chronic Patellar Instability

This encompasses long-standing instability issues where the kneecap consistently tracks abnormally. Patients may experience persistent discomfort, frequent episodes of subluxation, and gradual deterioration of knee function. This type often results from untreated acute injuries or congenital anatomical variations.

Habitual Patellar Dislocation

A rare form where the kneecap dislocates with every knee flexion movement. This typically develops in childhood due to severe anatomical abnormalities or contractures of surrounding soft tissues.

Causes

Traumatic injury: Direct blow to the knee or sudden twisting movements during sports
Anatomical abnormalities: Shallow trochlear groove, high-riding patella (patella alta), or misaligned leg bones
Ligament damage: Torn or stretched medial patellofemoral ligament (MPFL), the primary restraint preventing lateral displacement
Muscle imbalances: Weakness in the vastus medialis oblique (VMO) muscle or tightness in lateral structures
Previous dislocation: Initial injury increases risk of recurrence due to damaged stabilising structures

Risk Factors

Age: Most common in adolescents and young adults aged 10-20 years
Gender: Females have higher risk due to wider pelvis and increased Q-angle
Family history: Genetic predisposition to ligament laxity or anatomical variations
Sports participation: High-risk activities include basketball, soccer, gymnastics, and dance
Generalised ligament laxity: Conditions like Ehlers-Danlos syndrome increase overall joint instability
Muscle weakness: Poor quadriceps strength, particularly VMO weakness
Previous knee injuries: Prior trauma alters knee biomechanics and stability

Signs & Symptoms

Acute Episode Symptoms

Sudden, severe pain at the front and side of the knee
Visible deformity with kneecap displaced to the outside
Immediate swelling and bruising
Complete inability to straighten the knee
Feeling or hearing a “pop” during dislocation
Intense apprehension about moving the knee

Chronic Instability Symptoms

Persistent feeling of knee instability or “giving way”
Recurring episodes of kneecap shifting
Anterior knee pain, especially with stairs or prolonged sitting
Swelling after physical activities
Grinding or clicking sensations during movement
Difficulty with squatting or kneeling
Quadriceps weakness or atrophy

Between Episodes

Mild to moderate anterior knee discomfort
Apprehension during specific movements
Avoidance of activities that trigger instability
Compensatory gait patterns
Occasional catching or locking sensations

Symptoms typically worsen with activities requiring knee flexion and rotation. Many patients develop kinesiophobia (fear of movement) after experiencing dislocations, which can limit function.

Experiencing these symptoms? Don’t wait for them to worsen.

Schedule a consultation with our Senior Consultant Orthopaedic Surgeon for an accurate diagnosis and personalised treatment plan.

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When to See a Doctor

Seek immediate care if you experience a complete patellar dislocation with visible deformity or inability to move the knee. Even if the kneecap relocates spontaneously, evaluation helps identify damage and reduce recurrence risk.

Schedule a consultation if you notice recurrent instability, persistent anterior knee pain or episodes where your kneecap shifts. Early assessment may help prevent cartilage damage and chronic instability.

During your consultation, our orthopaedic surgeon will review your history, perform a physical examination with specific instability tests and discuss imaging. This clear assessment guides tailored treatment planning.

Diagnosis & Testing Methods

Clinical Examination: Includes the apprehension test and evaluation of patellar tracking, muscle strength and ligament laxity.
X-rays: Reveal bone alignment, fractures and anatomical risk factors (Merchant view, patella height, TT-TG distance).
MRI: Shows soft-tissue injury (MPFL), cartilage condition, loose bodies and bone bruising patterns.
CT Scan: Provides 3-D measurements of rotational alignment and TT-TG distance for surgical planning.

Treatment Options Overview

Conservative Management

First-time dislocations or mild instability are managed with rest, ice, compression, elevation and anti-inflammatory medication.

Physiotherapy

Structured rehabilitation strengthens the vastus medialis oblique and other supporting muscles. Programs progress from swelling reduction to sport-specific training, including taping or bracing techniques.

Bracing and Support

Patellar stabilising braces provide external support during recovery and return to activities. These devices feature lateral buttresses that prevent outward displacement while allowing normal knee motion. We may recommend specific braces for different activities, with some patients requiring long-term use during high-risk sports. Custom orthotics address any contributing foot mechanics issues.

Injection Therapies

For patients with associated inflammation or early arthritis, corticosteroid injections can provide temporary relief. Hyaluronic acid injections may benefit those with cartilage wear from chronic instability. Platelet-rich plasma (PRP) injections show promise in enhancing healing of partial MPFL tears, though evidence remains evolving.

MPFL Reconstruction

When conservative treatment fails or for recurrent dislocations, MPFL reconstruction surgically restores the primary restraint to lateral patellar displacement. This procedure uses a tendon graft (typically hamstring) to recreate the ligament. The surgery involves precise tunnel placement to restore normal anatomy while avoiding over-constraint. Recovery requires 6-9 months before returning to pivoting sports.

Tibial Tuberosity Transfer

Repositions the bony attachment of the patellar tendon to improve tracking in patients with malalignment. May be combined with MPFL reconstruction.

Trochleoplasty

Deepens a severely shallow trochlear groove in select cases.Due to technical demands and potential complications, it’s reserved for specific cases with severe anatomical abnormalities.

Every patient’s condition is unique.

Our Senior Consultant Orthopaedic Surgeon will assess your specific situation and recommend the most suitable treatment approach for you.

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Complications if Left Untreated

Untreated patellar instability leads to progressive joint damage and functional decline. Recurrent dislocations cause repeated trauma to the articular cartilage, resulting in chondral lesions and eventually patellofemoral arthritis. Each dislocation episode increases the likelihood of future instability, creating a cycle of worsening symptoms and joint degeneration.

Chronic instability alters knee biomechanics, placing abnormal stress on surrounding structures. This can lead to meniscal tears, ligament strain, and muscle atrophy. Patients often develop compensatory movement patterns that affect the hip and ankle joints, potentially causing pain and dysfunction throughout the kinetic chain.

The psychological impact includes developing movement anxiety and activity avoidance. Many patients limit their participation in sports and recreational activities, affecting overall fitness and quality of life. Young athletes may need to abandon competitive sports entirely if instability remains unaddressed, impacting both physical and mental wellbeing.

Prevention

Primary prevention focuses on identifying and addressing risk factors before first dislocation occurs. Maintaining strong quadriceps muscles, particularly the VMO, provides dynamic stability to the patella. Regular strengthening exercises should target the entire kinetic chain, including hip and core muscles that influence knee alignment.

Proper sports technique and conditioning reduce injury risk. Athletes should focus on landing mechanics, cutting techniques, and gradual training progression. Neuromuscular training programmes improve proprioception and reaction time, helping prevent traumatic dislocations during sports activities.

For those with anatomical predisposition or previous dislocation, secondary prevention strategies become crucial. This includes continuing strengthening exercises, using appropriate protective bracing during high-risk activities, and modifying activities that repeatedly stress the patellofemoral joint. Regular monitoring allows early intervention if instability symptoms develop.

Patellar Instability

Frequently Asked Questions

Can patellar instability heal on its own without treatment?

While minor subluxation episodes may resolve with rest, true patellar instability rarely improves without intervention. The damaged ligaments and altered mechanics typically require structured rehabilitation or surgery. Without treatment, most patients experience recurring episodes and progressive joint damage. Early professional assessment ensures appropriate management to prevent long-term complications.

How long does recovery take after MPFL reconstruction surgery?

Recovery follows a structured protocol over 6-9 months. Initial weeks focus on protecting the repair while regaining motion. By 3 months, most patients walk normally and begin strengthening. Return to straight-line running occurs around 4-5 months, with pivoting sports clearance typically at 6-9 months. Individual factors including tissue healing, rehabilitation compliance, and sport demands influence exact timelines.

Will I be able to return to sports after treatment for patellar instability?

Most patients successfully return to sports following appropriate treatment. Conservative management allows return to activities in 3-4 months for mild cases. After surgical reconstruction, athletes typically resume their previous level of competition, though this requires completing full rehabilitation. Our orthopaedic surgeon will guide your return based on objective strength testing, functional assessments, and your specific sport’s demands.

Is surgery always necessary for patellar instability?

Surgery isn’t always required, particularly for first-time dislocations without significant anatomical abnormalities. Many patients respond well to comprehensive physiotherapy and bracing. Recurrent instability, failed conservative treatment, or severe anatomical factors often necessitate surgical intervention. Our orthopaedic surgeon will recommend the most appropriate approach based on your specific condition, activity goals, and response to initial treatment.

What activities should I avoid if I have patellar instability?

During active instability, avoid activities involving jumping, pivoting, or deep knee flexion. High-risk sports include basketball, netball, soccer, and skiing. Complete activity avoidance isn’t the goal. With proper treatment and rehabilitation, most activities can be gradually resumed. We’ll provide specific guidelines based on your condition severity and treatment progress, ensuring safe return to your desired activities.

Can patellar instability affect both knees?

While patellar instability can affect both knees, it’s more commonly unilateral. Bilateral involvement occurs in about 30% of cases, often related to underlying anatomical factors or generalised ligament laxity. If you’ve experienced instability in one knee, we’ll assess both knees to identify any predisposing factors and implement preventive strategies for the unaffected side.

Conclusion

Patellar instability ranges from occasional mild subluxation to recurrent dislocations significantly impacting daily life. Understanding the specific type and contributing factors allows targeted treatment and may improve long-term knee stability.

Early evaluation and appropriate management help reduce complications and support a safe return to activity. With evidence-based treatment and consistent rehabilitation, many individuals regain confidence and functional stability in their knees.

Take the First Step Towards Knee Health

Early assessment can help protect your knee health. Our Senior Consultant Orthopaedic Surgeon will evaluate your condition and explain suitable management approaches.

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.