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Calcaneus Fracture (Sanders Classification and Management)

Most commonly fractured tarsal bone (60 percent of all tarsal fractures), typically resulting from axial loading injury (fall from height — 'lover's leap'); divided into intra-articular fractures (75 percent — Sanders classification by CT into Types I-IV based on number of articular fragments and displacement) and extra-articular fractures (25 percent — anterior process, sustentaculum tali, body, tuberosity); requires CT for surgical planning, with treatment ranging from non-operative management for non-displaced fractures to ORIF with plates or percutaneous screw fixation for displaced intra-articular fractures, and extended lateral approach falling out of favor due to wound complications in favor of sinus tarsi minimally invasive approach.

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 Calcaneus Fracture (Sanders Classification and Management)?

Calcaneus fracture is the most commonly fractured tarsal bone, accounting for 60 percent of all tarsal fractures and 1–2 percent of all fractures. Bimodal age distribution: young men with high-energy mechanisms (fall from height including occupational falls, motor vehicle collisions, sports) and elderly women with osteoporotic low-energy mechanisms (fall from standing). Bilateral injury common in fall from height (10 percent — must examine both feet), and association with vertebral compression fractures particularly L1 (10 percent — emergent spine assessment after calcaneus fracture from height fall is essential).

Anatomy and mechanism: calcaneus is largest tarsal bone, providing weight-bearing support and lever arm for Achilles tendon attachment; key articular surfaces include posterior facet (with talus — main weight-bearing subtalar joint surface), middle facet (with talus over sustentaculum tali), anterior facet, and calcaneocuboid joint. Mechanism: axial loading from fall from height drives talus downward into calcaneus through posterior facet, causing characteristic split or depression of articular surface; vertical force transmits through calcaneus body to ground producing primary fracture line; secondary fracture lines occur as energy dissipates. Force vectors and energy determine fracture pattern severity. Cancellous bone of calcaneus provides shock absorption but easily compressed in injury.

Sanders classification (CT-based, 1992, most widely used for intra-articular fractures): based on number of fragments at the posterior facet of subtalar joint as seen on coronal CT; Type I — non-displaced fracture (no fracture line or <2 mm displacement), suitable for non-operative management; Type II — two fragments (one fracture line), subdivided IIA (lateral fracture line), IIB (central), IIC (medial); Type III — three fragments (two fracture lines), subdivided IIIAB, IIIAC, IIIBC; Type IV — comminuted with more than three fragments, often considered for primary subtalar arthrodesis. Higher Sanders type indicates worse prognosis even with anatomic fixation.

Anatomic classification: joint depression type (most common, Essex-Lopresti described — large central depression of posterior facet articular fragment driven downward, with smaller anterolateral and posteromedial fragments) versus tongue type (lateral fragment elongated, depressed and rotated, often with proximal extension toward Achilles tendon insertion at tuberosity); ratio approximately 60:40 of depression to tongue type. Other extra-articular calcaneus fractures: anterior process avulsion (caused by extreme inversion plantarflexion, with bifurcate ligament avulsion of anterior process — frequently missed on initial radiographs, often diagnosed on CT or MRI for chronic lateral midfoot pain after 'sprain'); sustentaculum tali fracture (from forced foot eversion, may injure flexor hallucis longus tendon); calcaneal body fracture sparing posterior facet; calcaneal tuberosity fracture (avulsion type from Achilles tendon pull during forced ankle dorsiflexion or eccentric load — common in elderly osteoporotic patients with diabetes or kidney disease).

Symptoms

Heel pain and inability to bear weight after fall from height or trauma
Severe heel swelling and ecchymosis
Heel widening and shortening (loss of calcaneal width and height)
Decreased subtalar motion (eversion-inversion limited)
Tense heel pad with pain on palpation
Visible plantar ecchymosis (Mondor sign — diagnostic of calcaneus fracture)
Difficulty with active foot dorsiflexion (sustentaculum tali or FHL injury)
Compartment syndrome of foot (especially deep central compartment — pain out of proportion, tense compartment)
Bilateral injuries common after fall from height
Associated injuries — back pain (vertebral fracture, especially L1 — emergent spine assessment), other lower extremity injuries
Open fracture with overlying skin laceration
Chronic lateral midfoot pain after 'ankle sprain' (anterior process avulsion fracture missed initially)

Risk Factors

Fall from height (occupational, suicide attempt, accidental)
Motor vehicle collision (especially with vertical pedal impact)
Industrial accidents and explosions
Sports injuries (high-energy)
Osteoporosis (especially elderly women — low-energy fracture)
Diabetes (Charcot foot risk, calcaneal tuberosity avulsion)
Chronic kidney disease (renal osteodystrophy, fragility fracture)
Achilles tendinopathy (predisposes to avulsion fractures)
Steroid use (osteoporotic fragility)
Smoking (impaired bone healing)
Vitamin D deficiency
Polytrauma with multiple fractures

When to See a Doctor?

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

  • Heel pain and inability to bear weight after fall — emergency department
  • Bilateral heel pain after fall from height — examine both feet, assess spine for L1 vertebral fracture
  • Heel widening, shortening, or deformity — emergent assessment for fracture
  • Compartment syndrome features (pain out of proportion, tense foot compartments) — emergent
  • Open fracture or severe skin compromise — emergent
  • Vascular compromise of foot (cool, pulseless) — emergent
  • Persistent lateral midfoot pain weeks after 'sprain' (anterior process fracture missed initially)
  • Calcaneal tuberosity fracture in elderly with skin tenting — urgent for skin compromise
  • Failed non-operative management with persistent pain and disability
  • Late post-traumatic subtalar arthritis — for arthrodesis evaluation
  • Persistent lateral wall impingement after surgery
  • Chronic regional pain syndrome (CRPS) post-fracture

Treatment Methods

01
Initial assessment (emergency department): full mechanism description (fall from height — emergent assessment for spine and visceral injuries), bilateral foot examination, neurovascular assessment (dorsalis pedis, posterior tibial pulses, sural and tibial nerve sensation, motor function — toe flexion-extension), assessment for compartment syndrome of foot (pain out of proportion, tense central or lateral compartments, paresthesias, sensory loss — emergent fasciotomy if confirmed), associated injuries (spine — especially L1 with chest-thoracolumbar imaging, other lower extremities, abdominal in high-energy)
02
Imaging: lateral and axial (Harris) calcaneus radiographs (assess Bohler angle — normal 20–40 degrees, decreased to 0 or negative in significant fracture; angle of Gissane — normal 100–130 degrees, increased >130 degrees in fractures with depressed posterior facet), additional Broden views for posterior facet visualization; CT scan with multiplanar reconstruction is gold standard (defines Sanders classification, articular surface congruity, fragment positioning, surgical approach planning); MRI rarely needed but useful for occult fractures, soft tissue assessment, suspected anterior process avulsion in chronic 'sprain'
03
Non-operative management indications: Sanders Type I non-displaced intra-articular fractures, extra-articular fractures with minimal displacement, elderly low-demand patients, severe medical comorbidities precluding anesthesia, severe soft tissue compromise contraindicating surgery, patient preference; treatment with non-weight-bearing for 8–12 weeks (initially in posterior splint then removable boot), hinged ankle brace for protected mobilization, gentle range of motion exercises early to maintain ankle and subtalar motion, calf and intrinsic foot muscle strengthening, elevation and edema control, compression dressing
04
Operative indications: Sanders Type II-IV displaced intra-articular fractures, articular gap >2 mm or step-off >2 mm, significant loss of calcaneal width-height-length (height loss >5 mm, width >5 mm, length shortening), Bohler angle decreased >5 degrees from normal, displaced extra-articular fractures (anterior process if blocking subtalar motion, sustentaculum tali if displaced and impinging on flexor hallucis longus, displaced tuberosity threatening skin from Achilles pull), open fractures, calcaneal tuberosity avulsion with skin tenting (emergent reduction)
05
Surgical timing: timing depends on soft tissue condition; soft tissue swelling subsidence usually requires 7–14 days delay (until 'wrinkle test' positive — fine wrinkles appear when foot dorsiflexed, indicating soft tissue ready); urgent surgery for open fractures, vascular compromise, compartment syndrome, displaced calcaneal tuberosity fracture with skin tenting; staged management with temporary external fixation occasionally for severely swollen feet
06
Surgical approach: extended lateral L-shaped approach (historically standard, allows direct visualization of lateral wall, posterior facet, and calcaneocuboid joint; extended around lateral malleolus then plantar — high wound complication rate 25–30 percent including wound dehiscence, infection, sural nerve injury due to thin overlying soft tissue), increasingly replaced by sinus tarsi minimally invasive approach (smaller incision over sinus tarsi, lower wound complication rate 5–10 percent, comparable functional outcomes — preferred for many fractures), percutaneous screw fixation for select tongue-type fractures, posterior approach for tuberosity avulsion fractures
07
Surgical technique: open reduction with restoration of articular surface congruity (gold standard <2 mm step-off, <2 mm gap), restoration of calcaneal width-height-length and Bohler angle, fixation with calcaneal locking plate (lateral, low-profile titanium designed for sinus tarsi approach in modern era), supplemental screws (large diameter cannulated screws for fragment compression, smaller screws for additional fixation), bone grafting for large defects (autograft from iliac crest or femoral head, allograft, or bone substitutes — tricalcium phosphate, calcium phosphate cement, demineralized bone matrix); subtalar arthroscopy may assist with articular reduction visualization; primary subtalar arthrodesis for Sanders Type IV severely comminuted (avoids late arthrodesis for post-traumatic OA — bone graft, screw fixation, fusion of subtalar joint)
08
Special situations: open calcaneus fracture — emergent debridement, lavage, antibiotics, tetanus, often staged definitive fixation after wound stabilization (potentially with antibiotic-impregnated cement spacer, soft tissue coverage by plastic surgery using rotational flap or free flap if needed); compartment syndrome — emergent fasciotomy (medial and lateral approach to release nine compartments of foot); calcaneal tuberosity avulsion — emergent reduction and fixation if skin tenting present, due to risk of pressure necrosis and exposed bone; anterior process avulsion fracture — often non-operative if minimally displaced, surgical excision of small fragment if causing chronic impingement
09
Post-operative management: non-weight-bearing for 8–12 weeks (longer for primary arthrodesis 12–14 weeks), early range of motion exercises after wound healing (typically 2–3 weeks), hinged ankle brace, deep vein thrombosis prophylaxis, serial radiographs at 6 weeks, 3 months, 6 months, 1 year (assess healing, alignment, hardware integrity), physical therapy progression with subtalar and ankle range of motion, intrinsic foot muscle strengthening, gait training, custom orthotic for heel cushioning
10
Complications: wound complications (high rate especially with extended lateral approach — wound dehiscence, infection, deep infection requiring hardware removal); sural nerve injury (10–20 percent with extended lateral approach); peroneal tendon impingement against lateral wall (treated with lateral wall exostectomy); subtalar joint stiffness; subtalar post-traumatic osteoarthritis (most common long-term complication — 30–50 percent of intra-articular fractures, particularly Sanders Type III/IV; may require subtalar arthrodesis years later); chronic heel pain; chronic regional pain syndrome (CRPS); persistent foot widening with shoe-fitting issues; hardware prominence requiring removal; stress fracture from altered gait mechanics
11
Long-term: structured rehabilitation with physical therapy, gradual return to functional activities and work at 6–12 months depending on pattern severity (limited return to high-impact occupations or recreation), custom orthotic with heel cushioning and arch support, weight management, lifelong attention to osteoporosis if applicable, monitoring for post-traumatic subtalar arthritis (may require subtalar arthrodesis if disabling pain develops), patient education on activity modification and shoe selection, multidisciplinary care for complex post-traumatic foot deformity

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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.