Distal Femur (Thigh Bone) Fracture

Assessment, surgical management, and rehabilitation

What is a distal femur fracture?

A distal femur fracture is a break in the lower portion of the thigh bone, close to the knee. These fractures may occur:

Just above the knee joint
Through the bone immediately beneath the joint cartilage
Into the joint surface itself (intra-articular fractures)

Because this area plays a major role in weight-bearing and knee motion, accurate diagnosis and appropriate treatment are important for long-term function.

How do distal femur fractures occur?

The mechanism of injury varies depending on age, bone quality, and activity level.

Common causes include:

Low-impact falls in older adults, particularly in the presence of osteoporosis
High-energy trauma in younger patients, such as motor vehicle accidents or falls from height
Severe twisting or impact injuries during sport or physical activity

The severity of injury can range from a single fracture line to a comminuted injury with multiple fragments.

Symptoms

Symptoms often include:

Severe pain in the thigh or around the knee
Inability to stand or bear weight
Swelling and bruising
Obvious deformity or shortening of the leg
Restricted knee movement

These injuries require prompt medical assessment.

How is the diagnosis made?

Assessment includes a careful clinical examination and imaging to define the fracture pattern and plan treatment.

Imaging may include:

X-rays to assess alignment and fracture configuration
CT scan to evaluate joint involvement and fragment detail, particularly for intra-articular fractures
MRI in selected cases where ligament or cartilage injury is suspected

Accurate imaging allows treatment to be tailored to the specific injury.

Treatment options

Non-operative management

Non-operative treatment is suitable only for selected fractures that are stable and well aligned.

Management may include:

Bracing or immobilisation
Restricted or protected weight-bearing
Swelling control with ice and elevation
Regular follow-up X-rays to ensure the fracture remains stable
Physiotherapy once early healing is established

Careful monitoring is essential, as some fractures may shift over time.

Surgical management

Surgery is required for most distal femur fractures, particularly when:

The fracture is displaced
The joint surface is involved
The fracture is unstable or comminuted

Surgical treatment may involve:

Plates and screws to realign and stabilise the bone
Fixation of small fragments where required
Bone grafting in cases of bone loss
Reconstruction of the joint surface in complex intra-articular fractures

The goals of surgery are to restore alignment, allow early knee movement, and reduce the risk of long-term complications such as stiffness and post-traumatic arthritis.

Hospital stay

Typically 1–3 nights, depending on injury severity and treatment
Early mobilisation with physiotherapy
Pain and swelling managed with medication, ice, and elevation

Recovery and rehabilitation

Recovery depends on fracture type, bone quality, and whether surgery was required.

Typical rehabilitation milestones include:

0–6 weeks: Protection of the fracture, limited weight-bearing, swelling control
6–12 weeks: Gradual progression of weight-bearing and strengthening
3–6 months: Functional rehabilitation and low-impact activities
6–12 months: Return to higher-level sport or physically demanding work, where appropriate

Rehabilitation is coordinated with your physiotherapist and GP and adjusted based on healing progress.

Key points to remember

Distal femur fractures involve the lower portion of the thigh bone near the knee
Injury severity ranges from stable fractures to complex injuries involving the knee joint and/or associated ligaments
Some stable fractures may be managed without surgery
Most displaced or intra-articular fractures require surgical fixation
Rehabilitation is essential and recovery may take several months

Frequently Asked Questions

Driving should only resume once you can safely perform an emergency stop and control the vehicle comfortably. This often takes 6–12 weeks, depending on healing and treatment. Always confirm with your surgeon and insurer.
This depends on the physical demands of your job:
- Desk-based work: often 6–8 weeks
- Light-duty work: 8–12 weeks
- Heavy labour: 4–6 months
Fractures involving the joint surface carry a higher risk of post-traumatic arthritis. Accurate surgical repair and structured rehabilitation help minimise this risk.
No. Some stable, non-displaced fractures can be treated without surgery. However, most unstable or joint-involving fractures benefit from surgical stabilisation.

When to seek assessment

Any suspected thigh or knee fracture requires urgent medical assessment. Early diagnosis and appropriate management are key to achieving the best outcome.Have a question or want to book an appointment?

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