Supracondylar Fracture

Last updated: November 25, 2025
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Supracondylar Fractures

Elbow fracture account for 10% of childhood fractures. Supracondylar fractures are the most common paediatric elbow injury and will form the bulk of the discussion below. Elbow fractures have a high incidence of neurovascular complication at the distal humerus since the elbow acts as a very narrow tube that allows vessel (brachial, radial and ulnar) to pass through the forearm. Operative treatment should be considered for elbow fracture, especially in our setting due to the high risk of complications.

Classification of elbow fractures

FractureDescription
Supracondylar (40%)Fracture above the elbow. Fall ont an outstreched hand with the arm extended. Typical in children aged 5 – 7 years. Classified based on severity according to Gartland classification.
CondylarFracture through the medial or lateral condyle. Second most common elbow fracture. Typically involve the lateral condyle and affect the joint and physises. Risk of avascular necrosis due to distruption of blood supply. Commonly treated operatively.
EpicondylarFracture of the epicondyle. Occurs in school-aged boys. Usually invovles the medial epicondyle and does not typically require operative intervention

Gartland Classification of Supracondylar fractures

ClassificationDescription
Type INon-displaced. Treated with cast immobilization for 2 – 3 weeks.
Type IIDisplaced with posterior cortext intact. Treated with closed reduction and percutaneous pinning (CRPP)
Type IIIComplete displacement in 2 or 3 planes or rotational instability. Treated with CRPP or open reduction and percutaneous pinning (ORPP)
Type IVComplete periosteal disruption with instability in flexion and extension. Treated with CRPP or ORPP
  • Patient History (supracondylar fracture)
    • Child that fell with hyperextended arm
    • 5 – 7 years
    • Increased ligamentous laxity
  • Signs and symptoms
    • Pain at elbow
    • Swelling
    • Guarding
    • Irritability
    • Abnormal neurovascular exam
  • Physical exam
    • Should focus on detecting neurovascular complications
    • Check distal pulses (radial and ulnar arteries to ensure brachial artery is intact)
    • Watch for swelling (compartment syndrome)
    • Check for numbness of the hand (radial, ulnar nn.)
  • Investigation
    • X-Ray of the elbow: Best initial test
      • A line drawn along the anterior border of the distal humerus (anterior humeral line) should intersect the long axis of the capitellum in the middle third (1/3)
      • In the setting of a painful elbow following a fall, if this line does not intersect the capitellum, then a supracondylar fracture should be suspected.
    • Arteriogram: Emergency arteriogram if there are absent pulses
  • Treatment of a supracondylar fracture with vascular compromise
    • Arteriogram followed by ORPP/CRPP and Casting
  • Treatment of a supracondylar fracture without vascular compromise
    • Type I: casting for 2 – 3 weeks
    • Type II: CRPP
    • Type III and IV: ORPP/CRPP
  • Treatment of a supracondylar fracture with features of compartment syndrome
    • Emergent fasciotomy in addition to ORPP/CRPP and Casting
  • Complications of supracondylar fracture of the humerus
    • Vascular injury e.g. brachial artery
    • Nerve injury e.g. ulnar injury
    • Compartment syndrome: tightness, tender to palpation, discoloration, and pain on passive movement due to loss of circulation (or reperfusion)
    • Permanent disability
    • Volkmann’s contracture
Reference Intervals
Biochemistry
ACTHP: <80 ng/L
ALTP: 5–35 U/L
AlbuminP: 35–50 g/L
AldosteroneP: 100–500 pmol/L
Alk. phosphataseP: 30–130 U/L
α-AmylaseP: 0–180 IU/dL
α-FetoproteinS: <10 kU/L
Angiotensin IIP: 5–35 pmol/L
ADHP: 0.9–4.6 pmol/L
ASTP: 5–35 U/L
BicarbonateP: 24–30 mmol/L
BilirubinP: 3–17 μmol/L
BNPP: <50 ng/L
CRPP: <10 mg/L
CalcitoninP: <0.1 mcg/L
Calcium (ionized)P: 1.0–1.25 mmol/L
Calcium (total)P: 2.12–2.60 mmol/L
ChlorideP: 95–105 mmol/L
CholesterolP: <5.0 mmol/L
VLDLP: 0.128–0.645 mmol/L
LDLP: <2.0 mmol/L
HDLP: 0.9–1.93 mmol/L
Cortisol AMP: 450–700 nmol/L
Cortisol MidnightP: 80–280 nmol/L
CK ♂P: 25–195 U/L
CK ♀P: 25–170 U/L
CreatinineP: 70–100 μmol/L
FerritinP: 12–200 mcg/L
FolateS: 2.1 mcg/L
FSHP: 2–8 U/L ♂; >25 menopause
GGT ♂P: 11–51 U/L
GGT ♀P: 7–33 U/L
Glucose (fasting)P: 3.5–5.5 mmol/L
Growth hormoneP: <20 mu/L
HbA1C (DCCT)B: 4–6%
HbA1C (IFCC)B: 20–42 mmol/mol
Iron ♂S: 14–31 μmol/L
Iron ♀S: 11–30 μmol/L
Lactate (venous)P: 0.6–2.4 mmol/L
Lactate (arterial)P: 0.6–1.8 mmol/L
LDHP: 70–250 U/L
LHP: 3–16 U/L
MagnesiumP: 0.75–1.05 mmol/L
OsmolalityP: 278–305 mosmol/kg
PTHP: 0.8–8.5 pmol/L
PotassiumP: 3.5–5.3 mmol/L
Prolactin ♂P: <450 U/L
Prolactin ♀P: <600 U/L
PSAP: 0–4 mcg/mL
Protein (total)P: 60–80 g/L
Red cell folateB: 0.36–1.44 μmol/L
Renin (erect)P: 2.8–4.5 pmol/mL/h
Renin (recumbent)P: 1.1–2.7 pmol/mL/h
SodiumP: 135–145 mmol/L
TBGP: 7–17 mg/L
TSHP: 0.5–4.2 mU/L
T4P: 70–140 nmol/L
Free T4P: 9–22 pmol/L
TIBCS: 54–75 μmol/L
TriglyceridesP: 0.50–2.3 mmol/L
T3P: 1.2–3.0 nmol/L
Troponin TP: <0.1 mcg/L
Urate ♂P: 210–480 μmol/L
Urate ♀P: 150–390 μmol/L
UreaP: 2.5–6.7 mmol/L
Vitamin B12S: 0.13–0.68 nmol/L
Vitamin DS: 50 nmol/L
Arterial Blood Gases
pH7.35–7.45
PaCO₂4.7–6.0 kPa
PaO₂>10.6 kPa
Base excess±2 mmol/L
Urine
Cortisol (free)<280 nmol/24h
Hydroxyindole acetic acid16–73 μmol/24h
Hydroxymethylmandelic acid16–48 μmol/24h
Metanephrines0.03–0.69 μmol/mmol cr.
Osmolality350–1000 mosmol/kg
17-Oxogenic steroids ♂28–30 μmol/24h
17-Oxogenic steroids ♀21–66 μmol/24h
17-Oxosteroids ♂17–76 μmol/24h
17-Oxosteroids ♀14–59 μmol/24h
Phosphate (inorganic)15–50 mmol/24h
Potassium14–120 mmol/24h
Protein<150 mg/24h
Protein/creatinine ratio<3 mg/mmol
Sodium100–250 mmol/24h
Haematology
WCC4.0–11.0 ×10⁹/L
RBC ♂4.5–6.5 ×10¹²/L
RBC ♀3.9–5.6 ×10¹²/L
Hb ♂130–180 g/L
Hb ♀115–160 g/L
PCV ♂0.4–0.54 L/L
PCV ♀0.37–0.47 L/L
MCV76–96 fL
MCH27–32 pg
MCHC300–360 g/L
RDW11.6–14.6%
Neutrophils2.0–7.5 ×10⁹/L (40–75%)
Lymphocytes1.0–4.5 ×10⁹/L (20–45%)
Eosinophils0.04–0.44 ×10⁹/L (1–6%)
Basophils0–0.10 ×10⁹/L (0–1%)
Monocytes0.2–0.8 ×10⁹/L (2–10%)
Platelets150–400 ×10⁹/L
Reticulocytes0.8–2.0% / 25–100 ×10⁹/L
Prothrombin time10–14 s
APTT35–45 s
Paediatric
Pulse Rate (bpm)
Neonate140–160
Infant <1yr120–140
1–5 years110–130
5–12 years80–120
>12 years70–100
Respiratory Rate (tachypnoea)
0–2 months≥60/min
2–12 months≥50/min
1–5 years≥40/min
>5 years≥30/min
Blood Pressure (mmHg)
Term65/45
1 year75/50
4 years85/60
8 years95/65
10 years100/70
Weight Formulas
3–12 months(a + 9)/2 kg
1–6 years2a + 8 kg
>6 years(7a − 5)/2 kg
Haemoglobin (g/dL)
Term newborn13–20
1 month11–18
2 months10–15
1–2 years10–13
>2 years11–14
MUAC (6 months–5 years)
Obese>17.5 cm
Normal13.5–17.4 cm
At risk12.5–13.4 cm
Moderate malnutrition11.5–12.4 cm
Severe malnutrition<11.5 cm
Developmental Milestones
Social smile1.5 months
Head control4 months
Sits unsupported7 months
Crawls10 months
Stands unsupported10–12 months
Walks12–13 months
Talks18 months
CSF WBC (/mm³)
Term newborn0–25
>2 weeks0–5
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