Patella (Kneecap) Fracture
Assessment, treatment, and recovery
About the Patella (Kneecap)
The patella (kneecap) sits at the front of the knee and plays an important role in straightening the leg and protecting the joint. A fracture of the patella can significantly affect walking, knee extension, and weight-bearing.
Because the kneecap is central to knee mechanics, accurate assessment and appropriate treatment are essential to restore strength, function, and long-term joint health.
Types of patella fractures
Patella fractures vary in severity and stability. Common patterns include:
Stable fracture
The bone fragments remain in alignment
Often managed without surgery
Bracing and protected weight-bearing may be sufficient
Displaced fracture
Bone fragments are separated or out of position
Surgical fixation is often required to restore knee function
Comminuted fracture
The kneecap is broken into multiple fragments
Usually unstable and commonly requires surgery
Open fracture
The skin over the knee is broken
Bone and soft tissues are exposed
Higher risk of infection
Requires urgent surgical management
How do patella fractures occur?
Patella fractures usually result from:
A direct blow to the front of the knee (such as a fall onto the knee, sporting collision, or motor vehicle accident)
A sudden, forceful contraction of the quadriceps muscle (less common)
The severity of the fracture depends on the magnitude of the force involved and the underlying quality of the bone.
Symptoms
Symptoms may include:
Pain at the front of the knee
Immediate swelling or bruising
Difficulty or inability to straighten the knee
Difficulty walking or bearing weight
Tenderness over the kneecap
In severe cases, visible deformity
These injuries require prompt medical assessment.
Diagnosis
Diagnosis is based on:
A clinical examination assessing pain, swelling, and knee extension
Imaging to confirm the fracture pattern and stability
Investigations may include:
X-rays to identify fracture type and displacement
CT scans if the fracture pattern is complex
This information guides treatment decisions.
Treatment Options
Non-operative management
Non-operative treatment may be appropriate for stable, non-displaced fractures.
This may include:
Knee immobiliser or extension brace
Restricted or protected weight-bearing
Ice, elevation, and pain management
Physiotherapy once early healing has occurred
Follow-up imaging may be required to ensure the fracture remains stable during healing.
Surgical management
Surgery is typically recommended for:
Open fractures
Displaced fractures
Comminuted fractures
Injuries affecting the extensor mechanism
Surgical treatment aims to:
Realign and stabilise the kneecap
Restore the ability to straighten the knee
Minimise stiffness and long-term complications
Fixation may involve screws, plates, wires, or other stabilisation techniques, depending on the fracture pattern.
Recovery and rehabilitation
Recovery depends on fracture severity and treatment.
A typical recovery timeline may include:
0–6 weeks: Brace immobilisation and protected weight-bearing
6–12 weeks: Gradual return of movement and strengthening
3–6 months: Return to most daily activities
6–12 months: Return to higher-impact activity or manual work
Rehabilitation is essential to restore strength, motion, and confidence in the knee.
Key points to remember
Open fractures require urgent treatment
Patella fractures can significantly affect knee strength and mobility
Stable fractures may be managed without surgery
Displaced, comminuted, or open fractures usually require surgery
Rehabilitation plays a critical role in recovery
Frequently Asked Questions
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Driving may resume once you can safely control the leg, perform an emergency stop, and are no longer restricted by pain or bracing.
This is commonly around 6–8 weeks, but varies depending on healing and treatment. Always confirm with your insurer. -
This depends on job demands:
Desk-based work: often 4–6 weeks
Light physical work: 6–12 weeks
Heavy manual work: 3–6 months
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Low-impact exercise may begin once healing is confirmed, often around 6–8 weeks
Running, jumping, and contact sports typically require 3–6 months or longer
Progression is guided by rehabilitation and recovery.
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There is a risk of post-traumatic arthritis, particularly after displaced or comminuted fractures. Accurate treatment and rehabilitation help reduce this risk.
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No. Many stable fractures heal well with bracing and physiotherapy. Surgery is required when the fracture is displaced, unstable, or open.
