Can Near-Infrared Spectroscopy (NIRS) or Intramuscular Glucose Levels Detect Impaired Leg Compartment' Perfusion?

Inclusion Criteria: 1. 18 years of age to 75 years of age 2. Diagnosis of tibial fracture or fracture-dislocation complicated by diagnosis of acute compartment syndrome AND/OR diagnosis of concomitant vascular injury with documented loss of pulses in the leg below the knee 3. Unilateral injury (i.e. only one leg is affected) 5\) Depth of anterior compartment of the leg \< 2.5 cm (as measured by ultrasound) 6) Willing to consent to the study Exclusion Criteria: 1. Younger than 18 years of age or over 75 years of age 2. Skin damage, open wound or infection at the skin overlying the anterior muscular compartment, preventing NIRS sensor placement. 3. Depth to the muscle more than 3 cm as assessed with ultrasound. 4. History of fasciotomy performed on the affected leg. 5. Inability to obtain the informed consent from the patient of legal guardian or healthcare surrogate. 6. Language barrier- Inability to read or understand spoken English