In Vivo Intramuscular pH in Tibia Fractures Is Acidic Prior to Stabilization and Equilibrates Toward Systemic pH 48 h
Danielle F Peterson1, Loren O Black1, Karalynn Lancaster1
1Orthopaedics & Rehabilitation, Oregon Health & Sciences University, Portland, Oregon, USA.
Summary
Intramuscular pH (IpH) in tibia fractures is highly acidic before surgery, normalizing within 48 hours post-operation. This study highlights IpH as a potential diagnostic marker, unlike unreliable pressure measurements for acute compartment syndrome.
Area of Science:
- Orthopedic Surgery
- Trauma Care
- Physiology
Background:
- Acute compartment syndrome (ACS) diagnosis is challenging.
- Transcutaneous intramuscular pressure (TIMP) is unreliable for ACS.
- In vivo limb pH balance in lower extremity injuries is poorly understood.
Purpose of the Study:
- Quantify acid-base chemistry via intramuscular pH (IpH) in tibia fractures.
- Compare IpH to venous pH (VpH) and TIMP measurements.
- Investigate IpH changes during fracture healing.
Main Methods:
- Observational study of 39 tibia fracture patients.
- Invasive IpH and VpH measurements pre- and post-operatively (48h).
- TIMP measurements during surgery.
Main Results:
- Initial IpH was significantly acidic (6.57) vs. VpH (7.35).
- IpH normalized to VpH within 48h post-surgery.
- Strong positive correlation between IpH and VpH (r=0.476).
- No correlation between TIMP and IpH (r=0.041).
Conclusions:
- Tibia fracture musculature is significantly more acidic than systemic circulation pre-operatively.
- Limb IpH normalizes within 48h after surgical stabilization.
- TIMP is not correlated with direct intramuscular physiology (IpH), underscoring the need for improved diagnostic tools.
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