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Distal Femur Fracture (Supracondylar and Periprosthetic Patterns)

Fracture of distal femur involving supracondylar, intercondylar, or condylar regions; bimodal age distribution with high-energy in young patients (motor vehicle, fall from height) and low-energy fragility fractures in elderly with osteoporosis (often periprosthetic around total knee arthroplasty); AO/OTA classification 33-A (extra-articular), 33-B (partial articular), 33-C (complete articular); treatment with locked plating (lateral distal femoral locking plate) or retrograde intramedullary nailing depending on fracture pattern, distal fragment size, and presence of TKA; periprosthetic fractures classified by Su classification (Type I, II, III based on relation to femoral component) and managed with retrograde nailing if open box implant or revision TKA with stem extension if blocked.

Written by: Saygı Hospital Health Guide Editorial Board
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This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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What is Distal Femur Fracture (Supracondylar and Periprosthetic Patterns)?

Distal femur fracture involves the supracondylar, intercondylar, and condylar regions of distal femur, accounting for 4–7 percent of all femoral fractures and 0.4 percent of all fractures. Bimodal age distribution with two distinct populations: young men with high-energy mechanisms (motor vehicle accidents 53 percent, fall from height 19 percent, sports and industrial injury) producing complex comminuted patterns and frequent associated injuries; and elderly women with low-energy fragility mechanisms (simple fall in osteoporotic patients, ground level fall) often associated with osteoporosis and increasingly with total knee arthroplasty (TKA — periprosthetic fracture incidence rising as TKA prevalence and patient longevity increase).

AO/OTA classification (33 = distal femur): Type A — extra-articular supracondylar fractures (A1 simple, A2 wedge with intermediate fragment, A3 multifragmentary metaphyseal); Type B — partial articular fractures with intact remaining condyle (B1 lateral condyle sagittal split, B2 medial condyle sagittal split, B3 frontal/coronal posterior condyle split — Hoffa fracture, often missed on standard X-ray and requires CT); Type C — complete articular intercondylar fractures with metaphyseal involvement (C1 articular and metaphyseal simple T or Y, C2 articular simple with multifragmentary metaphysis, C3 articular and metaphyseal both multifragmentary). Each type has subdivisions for further specificity. Higher type number generally indicates greater complexity and worse prognosis.

Special situations: (1) Hoffa fracture (33-B3) — coronal split of posterior femoral condyle (lateral condyle most common, accounting for 86 percent), often unilateral but bilateral in 13 percent of intercondylar T/Y fractures; classically high-energy injury (motor vehicle accident with hyperflexion of knee against pedal); easily missed on standard X-ray (usually requires high index of suspicion and CT for diagnosis); requires anatomic reduction and rigid fixation due to risk of nonunion and post-traumatic osteoarthritis; (2) Periprosthetic distal femur fracture around total knee arthroplasty — incidence 0.3–2.5 percent of TKAs, increasing with aging population and bilateral TKA prevalence; classified by Su classification (most widely used): Type I — proximal to femoral component, no extension into component fixation zone; Type II — originates at proximal extent of femoral component, extends proximally into shaft; Type III — involves or extends below femoral component, may compromise fixation; treatment varies by type, component stability, and patient factors; (3) Pediatric distal femur physeal fracture — Salter-Harris classification with potential for growth disturbance, especially Salter-Harris II and III; risk of growth arrest and limb length discrepancy.

Concomitant injuries occur in 35 percent of distal femur fractures: knee ligament injuries (anterior and posterior cruciate ligaments, medial and lateral collateral ligaments, posterolateral corner — assess after fracture stabilization with examination under anesthesia), meniscal tears, popliteal artery injury (5–10 percent in high-energy with knee dislocation pattern, knee dislocation often associated, emergent ABI <0.9 warrants CT angiography), common peroneal nerve injury (rare in distal femur fracture itself, more with associated knee dislocation), compartment syndrome of leg or thigh (rare but possible), open fracture (significant rate in high-energy with skin laceration), polytrauma (motor vehicle accident with head, chest, abdominal injuries — ATLS-based primary survey).

Symptoms

Knee or thigh pain and inability to bear weight after trauma
Knee swelling, deformity, or shortening
Hemarthrosis (intra-articular fracture)
Distal extremity vascular compromise (cool, pale, pulseless foot — emergent for popliteal artery injury especially with knee dislocation pattern)
Common peroneal nerve injury (foot drop — rare in distal femur fracture itself)
Compartment syndrome features (rare but possible)
Open wound with visible bone (open fracture)
Total knee arthroplasty patient with new knee pain after fall (periprosthetic fracture)
Bilateral injuries possible in motor vehicle accident
Low-energy fall in elderly osteoporotic patient with knee deformity (fragility fracture)
Hoffa fracture often presents with hemarthrosis and lateral knee pain after high-energy injury (high index of suspicion needed)
Pediatric patient with knee pain and difficulty walking after sports injury

Risk Factors

High-energy trauma (motor vehicle accident, fall from height, contact sports)
Osteoporosis (especially elderly women — fragility fracture)
Total knee arthroplasty (periprosthetic fracture risk)
Pediatric age (open physis risk, Salter-Harris fractures)
Pre-existing knee deformity or osteoarthritis (less stable bone)
Sedentary lifestyle (more prone to falls)
Vitamin D deficiency
Chronic corticosteroid use (osteoporotic fragility)
Smoking (impaired bone healing)
Diabetes (increased nonunion and infection risk)
Anti-resorptive medication use (atypical femoral fracture risk in some)
Polytrauma with multisystem injuries

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Knee or thigh pain and inability to bear weight after trauma — emergency department
  • Knee deformity or open fracture — emergent
  • Distal extremity vascular compromise (cold, pulseless foot) — emergent (high suspicion if knee dislocation suspected)
  • Common peroneal nerve deficit (foot drop) after knee injury
  • Compartment syndrome features (pain out of proportion) — emergent
  • TKA patient with new knee pain after fall — urgent for periprosthetic fracture
  • Persistent knee pain in elderly with negative initial X-ray (occult Hoffa fracture or supracondylar — order CT)
  • Failed non-operative management of presumed minor injury
  • Late post-traumatic knee osteoarthritis or symptomatic malunion or nonunion
  • Hardware failure or wound complications post-operatively
  • TKA loosening or revision considerations
  • Pediatric distal femur fracture — for assessment of growth plate involvement and surgical planning

Treatment Methods

01
Initial assessment (emergency department): ATLS-based primary survey for high-energy trauma, complete neurovascular examination of injured extremity (palpate dorsalis pedis and posterior tibial pulses bilaterally, capillary refill, color, temperature, ankle-brachial index ABI <0.9 on injured side warrants CT angiography for popliteal artery injury, motor function with foot dorsiflexion-plantarflexion, sensation in deep peroneal-superficial peroneal-tibial-sural-saphenous distributions, common peroneal nerve assessment), examination for compartment syndrome of leg or thigh, assessment for associated injuries in polytrauma (head, spine, chest, abdomen, other extremities)
02
Imaging: AP and lateral radiographs of distal femur with knee (full length femur and tibia recommended for fracture pattern assessment, periarticular extension, associated injuries; both knees if bilateral suspected), AP pelvis to assess hip; CT scan with multiplanar reconstruction is highly recommended for surgical planning of intra-articular fractures (defines articular surface, fragment positioning, Hoffa fracture detection — often missed on standard X-ray), useful for periprosthetic fractures to assess component fixation; MRI for ligamentous and meniscal assessment particularly before fixation in young high-functioning patients (often deferred to 6 weeks post-fracture for ligament evaluation when swelling subsides); CT angiography or conventional angiography for suspected vascular injury (ABI <0.9, hard signs of vascular injury — pulselessness, expanding hematoma, bruit, distal ischemia)
03
Non-operative management indications (rare for distal femur due to displacement risk and stiffness): stable non-displaced fractures (very rare), elderly low-demand patients with severe medical comorbidities precluding anesthesia, severe soft tissue compromise, patient preference; treatment with long leg cast or hinged knee brace with non-weight-bearing for 8–12 weeks, gentle range of motion exercises after 4–6 weeks if stable, follow-up imaging at 6 weeks and 3 months; not usually preferred due to high rate of malunion, knee stiffness, and disability
04
Operative indications (most distal femur fractures): displaced fractures, intra-articular fractures (>2 mm articular step-off or gap), unstable fracture patterns, polytrauma requiring early mobilization, open fractures, neurovascular injury requiring exploration, periprosthetic fractures (most), failed conservative management with displacement or stiffness
05
Surgical timing: ideally within 24–72 hours of injury for closed fractures, sooner for open fractures or compartment syndrome; delayed for severely swollen extremities (soft tissue 'wrinkle test' positive); urgent for vascular compromise or open fractures; staged management with temporary spanning external fixator occasionally for severe high-energy fractures with soft tissue swelling, then definitive ORIF after 1–3 weeks
06
Surgical options: (1) Lateral distal femoral locking plate (LDFLP) — most common modern treatment, applied via lateral approach (open or minimally invasive percutaneous plate osteosynthesis MIPPO); locking screws provide angular stability in osteoporotic distal fragment, allowing compression fixation for simple patterns and bridge plating for comminuted patterns; multiple plate types available (LISS, NCB, Synthes, others); (2) Retrograde intramedullary nailing — entry through intercondylar notch (with patellar dislocation or splitting approach), nail advanced retrograde into femoral shaft, distal locking screws for fixation; useful for short distal fragment with sufficient bone, native knee (no TKA) with healthy joint, periprosthetic fractures around open-box femoral component allowing nail passage; less useful for very distal fractures or those with intra-articular extension; (3) Revision total knee arthroplasty with stem extension — for periprosthetic fractures with loose component, very distal fractures with insufficient bone for plate or nail fixation; (4) Distal femoral replacement (megaprosthesis) — for severely comminuted intra-articular fractures in elderly with severe osteoporosis or pre-existing severe arthritis, certain periprosthetic fractures with massive bone loss, oncologic resection
07
Periprosthetic distal femur fracture (Su classification-based management): Type I (proximal to component, no fixation extension) — treat as standard supracondylar fracture with lateral locking plate or retrograde nail (if open-box implant); Type II (originates at proximal extent of component, extends proximally) — typically lateral locking plate; Type III (involves or extends below component) — assess component stability — if stable component with adequate distal bone, lateral locking plate or retrograde nail (if open-box); if loose component or insufficient bone, revision TKA with stem extension or distal femoral replacement; consider patient factors (age, demand, comorbidities)
08
Hoffa fracture (33-B3 coronal posterior condyle): early CT diagnosis essential (often missed on standard X-ray); anatomic reduction with rigid fixation through lateral parapatellar or posterior approach; cannulated screws (3.5 or 4.5 mm) typically from anterior to posterior capturing fragment; high rate of nonunion and post-traumatic osteoarthritis if missed or inadequately fixed
09
Special situations: open fracture — emergent debridement, lavage, antibiotics, tetanus, often staged definitive fixation; vascular injury — vascular surgery for repair (saphenous vein graft if interposition needed), bone fixation either before or after vascular repair depending on stability and time; compartment syndrome — emergent fasciotomy of affected compartments (4-compartment release of leg, anterior-posterior compartment release of thigh); pediatric distal femur physeal fracture — Salter-Harris classification, surgical anatomic reduction often required for displaced types II-IV with smooth pin or cannulated screw fixation, careful follow-up for growth disturbance over 1–2 years
10
Post-operative management: protected weight-bearing depending on fixation construct (typically non-weight-bearing or toe-touch for 6–12 weeks then progressive), early range of motion exercises (continuous passive motion CPM machine for first 1–2 weeks improves knee flexion outcomes), hinged knee brace, deep vein thrombosis prophylaxis (low-molecular-weight heparin or alternative), serial radiographs at 6 weeks, 3 months, 6 months, 1 year (assess healing, alignment, hardware integrity), physical therapy progression with quad-strengthening and gradual return to function
11
Complications and long-term: knee stiffness (most common — early CPM, aggressive PT essential to prevent), knee post-traumatic osteoarthritis (especially intra-articular fractures — may eventually require TKA or revision TKA), nonunion or malunion (more common with comminuted patterns and osteoporotic bone), infection (especially open fractures, smokers, diabetics), hardware failure (locking plates may break or screws back out, especially with delayed weight-bearing in osteoporotic bone), DVT/PE, neurovascular injury complications, prolonged recovery and disability (functional outcomes generally good but full recovery may take 12 months or longer), need for hardware removal if symptomatic, secondary procedures (TKA for post-traumatic OA, revision TKA for hardware-related complications)
12
Long-term: structured rehabilitation with physical therapy (range of motion, strength, gait training, balance, proprioception), gradual return to functional activities and sport at 6–12 months depending on pattern severity, lifelong attention to osteoporosis if applicable (DEXA scan, supplementation, bisphosphonate or denosumab as indicated), patient education on activity modification and fall prevention, multidisciplinary care including orthopedic surgeon, primary care, geriatrician, physical therapist, osteoporosis specialist for elderly patients with fragility fracture

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.