Ultrasound-derived tibia-fascia angle for noninvasive assessment of intracompartmental pressure in tibial plateau fractures.

ΔTFA demonstrated a significant linear correlation with intracompartmental pressure after adjustment for confounders.

• Multivariable linear regression yielded β = 1.74 mmHg/°, 95% CI: 1.07–2.41, Padj < 0.001
• Spearman correlation showed a moderate monotonic association: ρ = 0.545, 95% CI: 0.395–0.667, P < 0.001
• TFA was measured bilaterally using B-mode ultrasound by blinded operators
• Invasive ICP served as the reference standard

ΔTFA achieved moderate diagnostic accuracy for detecting high compartment pressure (ICP > 30 mmHg).

• AUC of 0.716 (95% CI: 0.621–0.812) for detecting HCP defined as ICP > 30 mmHg
• Optimal cutoff was ΔTFA ≥ 4.9°
• Sensitivity at optimal cutoff was 86.5%
• Specificity at optimal cutoff was 52.9%

The study enrolled 105 patients with closed tibial plateau fractures at a tertiary trauma center.

• This was an observational study design
• All patients had closed tibial plateau fractures
• TFA was measured bilaterally using B-mode ultrasound
• Operators performing ultrasound measurements were blinded

The high sensitivity but limited specificity of ΔTFA supports its use as a screening tool rather than a standalone diagnostic test.

• Sensitivity of 86.5% supports screening utility to avoid missed cases of high compartment pressure
• Specificity of 52.9% indicates a notable false-positive rate
• Authors noted that 'specificity limitations warrant complementary confirmatory tests'
• The authors describe ΔTFA as providing 'moderate diagnostic accuracy as a screening tool for HCP'

The authors concluded that ΔTFA integration into trauma workflows could enhance early risk stratification, particularly for high-energy fractures.

• ΔTFA was described as a 'rapid, operator-friendly method for noninvasive ICP estimation'
• Potential benefit was highlighted specifically for high-energy fractures
• The method is positioned as complementary to, not replacing, confirmatory tests
• Current noninvasive diagnostics for ACS were characterized as lacking 'clinical practicality and reliability'