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Adjusting a Traverse

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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Quantifying Orthotic Correction of Trigonocephaly Using Optical Surface Scanning.

Jason A Ramsey¹, Phillip M Stevens², Shane R Wurdeman²

¹Hanger Clinic, Nashville, TN.

The Journal of Craniofacial Surgery

|July 28, 2021

Summary

Optical surface scanning offers a safe method to measure trigonocephaly (metopic synostosis) in infants. This technique accurately tracks frontal angle changes during treatment, improving monitoring for surgical and orthotic interventions.

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Area of Science:

Craniofacial Surgery
Pediatric Neurosurgery
Medical Imaging Technology

Background:

Traditional methods for measuring trigonocephaly are hazardous for longitudinal infant data collection.
Optical surface scanning provides safe craniometric data but lacks established protocols for trigonocephaly assessment within clinical time constraints.

Purpose of the Study:

To evaluate a novel, safe, and repeatable method for measuring the frontal angle (FA) in infants with trigonocephaly.
To assess the utility of optical surface scanning technology for monitoring treatment progress with cranial remolding orthoses.

Main Methods:

Retrospective analysis of optical scans from infants treated for metopic synostosis with endoscopic-assisted craniectomy and cranial remolding.
Development and application of a novel "FA30" measurement technique using surface landmarks (glabella, frontotemporali).
Comparison of FA30 measurements between trigonocephalic subjects, a control group, and other non-synostotic deformities; assessment of inter-rater reliability.

Main Results:

Infants with trigonocephaly exhibited significantly lower initial FA30 values compared to controls (P < 0.001).
Mean FA30 increased significantly from 121.5° to 138.5° during orthotic treatment (P < 0.001), approaching the control mean of 144.4°.
The FA30 measurement demonstrated high inter-rater reliability (ICC: 0.993) and agreement.

Conclusions:

Optical surface scanning, using the FA30 method, offers a safe, accurate, and repeatable approach for measuring frontal angle in infants.
The observed increase in FA30 confirms the effectiveness of cranial remolding in correcting trigonocephaly.
This method facilitates timely treatment progress reporting and holds potential for optimizing outcomes across multiple treatment centers.