Evaluation of positional plagiocephaly: Conventional anthropometric measurement versus laser scanning method

Reliability and Agreement of Automated Head Measurements From 3-Dimensional Photogrammetry in Young Children

This study aimed to assess the reliability and agreement of automated head measurements using 3-dimensional (3D) photogrammetry in young children. Specifically, the study evaluated the agreement between manual and automated occipitofrontal circumference (OFC) measurements (n = 264) obtained from 3D images of 188 patients diagnosed with sagittal synostosis using a novel automated method proposed in this study. In addition, the study aimed to determine the interrater and intrarater reliability of the automatically extracted OFC, cephalic index, and volume. The results of the study showed that the automated OFC measurements had an excellent agreement with manual measurements, with a very strong regression score ( R2 = 0.969) and a small mean difference of -0.1 cm (-0.2%). The limits of agreement ranged from -0.93 to 0.74 cm, falling within the reported limits of agreement for manual OFC measurements. High interrater and intrarater reliability of OFC, cephalic index, and volume measurements were also demonstrated. The proposed method for automated OFC measurements was found to be a reliable alternative to manual measurements, which may be particularly beneficial in young children who undergo 3D imaging in craniofacial centers as part of their treatment protocol and in research settings that require a reproducible and transparent pipeline for anthropometric measurements. The method has been incorporated into CraniumPy, an open-source tool for 3D image visualization, registration, and optimization, which is publicly available on GitHub ( https://github.com/T-AbdelAlim/CraniumPy ).

Another look at “tummy time” for primary plagiocephaly prevention and motor development

It is three decades since it was recommended that infants sleep on the back to reduce risk of sudden unexpected infant death (SUID). The SUID prevention program is known as "back to sleep" or "safe sleeping", and this initiative is not questioned. Sleeping on the back is associated with, but not the cause of, the development of infant positional plagiocephaly, also known as deformational or a non-synostotic misshapen head when the skull sutures are open, not fused. This paper provides a synthesis of the history and impact of positional plagiocephaly. It includes a scoping review of plagiocephaly prevention facilitating motor development and reveals few articles on primary prevention which aims to prevent it developing in the first place. It is concerning that preschool-aged children with a history of infant plagiocephaly continued to receive lower developmental scores, particularly in motor development, than unaffected controls, and this may be a marker of developmental delay. Tummy-time (prone) for play is the mainstay of plagiocephaly prevention advice to minimize development of plagiocephaly and to facilitate infant motor development, particularly head control. While tummy-time has shown benefit for infant development, there is limited evidence of its effectiveness in preventing plagiocephaly and some evidence that it promotes only prone-specific motor skills. Most of the published literature is concerned with treatment post-diagnosis, in the form of reviews, or clinical notes. There is a plethora of opinion articles reinforcing tummy-time from birth for plagiocephaly prevention. The review shows that there are gaps in advice for early infant development of head control. An accepted test of head control in infants is "pull to sit" from supine which demonstrates antigravity strength of the neck flexors and coordination of the head and neck when the infant is drawn to sit from supine. This motor skill was cited as achievable by 4 months in the earliest paper on plagiocephaly in 1996. Physical therapists and others should revisit the mechanism of early infant head control development against gravity, particularly antigravity head, neck and trunk coordinated flexion movement in supine, as there has been little attention to early facilitation of this motor skill as a plagiocephaly prevention strategy. This may be achieved by considering "face time" as well as tummy time for primary prevention of plagiocephaly.

Computer Guided Generated Dual-Purpose Splint for Bilateral Sagittal Split Osteotomy

Purpose

to evaluate the efficacy of dual-purpose computer-generated splint in guiding the proximal and the distal segment in bilateral sagittal split osteotomy.

Patients and Method

It was a prospective case series study directed on 8 class III patients indicating the need of maxillary advancement and mandibular set back by bilateral sagittal split osteotomy. A CAD/CAM splint is generated to guide the distal segment to the stable maxilla and at the same time a grooved extension to engage the proximal segment ensuring the condyle in its planned position during fixation. The primary outcome was measured by calculating the difference between the pre- and post-operative condylar segment position.

Results

The present study included five female patient and three male patient with mean age of 28.4 ± 5.1 years. The accuracy of the splint in positioning the mandibular proximal segment showed promising results ranging from 2.59 to 0.49.

Conclusion

The dual-purpose splint introduced in this study showed satisfied results in maintaining the pre-operative condylar position while securing the distal segment in the desired plan.

Anthropometric Landmarking for Diagnosis of Cranial Deformities: Validation of an Automatic Approach and Comparison with Intra- and Interobserver Variability

Shape analysis of infant's heads is crucial to diagnose cranial deformities and evaluate head growth. Currently available 3D imaging systems can be used to create 3D head models, promoting the clinical practice for head evaluation. However, manual analysis of 3D shapes is difficult and operator-dependent, causing inaccuracies in the analysis. This study aims to validate an automatic landmark detection method for head shape analysis. The detection results were compared with manual analysis in three levels: (1) distance error of landmarks; (2) accuracy of standard cranial measurements, namely cephalic ratio (CR), cranial vault asymmetry index (CVAI), and overall symmetry ratio (OSR); and (3) accuracy of the final diagnosis of cranial deformities. For each level, the intra- and interobserver variability was also studied by comparing manual landmark settings. High landmark detection accuracy was achieved by the method in 166 head models. A very strong agreement with manual analysis for the cranial measurements was also obtained, with intraclass correlation coefficients of 0.997, 0.961, and 0.771 for the CR, CVAI, and OSR. 91% agreement with manual analysis was achieved in the diagnosis of cranial deformities. Considering its high accuracy and reliability in different evaluation levels, the method showed to be feasible for use in clinical practice for head shape analysis.

Body size measuring techniques enabling stress-free growth monitoring of extreme preterm infants inside incubators: A systematic review

Introduction

Growth monitoring of preterm infants is essential for assessing the nutritional effects on their growth. The current growth monitoring techniques are too stressful, however, for the smallest preterm infants. We performed a systematic review to summarize studies on stress-free techniques for measuring the body size of preterm infants inside incubators other than the traditional calliper and tape measure-based instruments.

Methods

We searched four online literature databases: Embase, Medline, Web of Science Core Collection, and Cochrane, using search terms related to patients (neonates, infants, children) and body size measuring techniques. By means of expert judgement we assessed the techniques’ suitability for stress-free body size measurement of an infant lying in an incubator. As a criterion for suitability, we used an imaginary ideal technique.

Results

Twenty-six studies were included in this review. In 24 studies, the technique for body size measurement was related to 3D technology, and the majority of these studies acknowledged clinical superiority of 3D over 2D data. Two 3D techniques were assessed as suitable for stress-free measurement of preterm infants inside incubators. The first technique used a commercially available 3D handheld scanner which needed 3D postprocessing to derive measurement data. The second technique used a self-developed stereoscopic vision system.

Conclusions

3D volumetric parameters have higher clinical value for growth monitoring than 2D. In addition, contactless 3D measurements enable stress-free growth monitoring of even the smallest preterm infants. However, the time-consuming 3D postprocessing challenges the usability of 3D techniques. Regrettably, none of the identified suitable 3D techniques met all our requirements of an ideal all-in-one body size measuring technique for extreme preterm infants. Handheld 3D scanning might have the best properties for developing this ideal technique.

Novel Screening and Monitoring Techniques for Deformational Plagiocephaly: A Systematic Review

This article summarizes the current state of diagnostic modalities for infant craniofacial deformities and highlights capable diagnostic tools available currently to pediatricians.

Consistency of Cranial Shape Measures Obtained From Laser Surface and Computed Tomography Imaging

OBJECTIVE

Children with cranial shape abnormalities are often subjected to radiation from computed tomography (CT) for evaluation and clinical decision making. The STARscanner Laser Data Acquisition System (Orthomerica, Orlando, FL) may be a noninvasive alternate. The purpose of this study is to determine whether the STARscanner provides valid and accurate cranial measurements compared to CT.

DESIGN

We performed an institutional review board-approved retrospective review of a prospectively maintained database of patients with metopic suture abnormalities from 2013 to 2016.

SETTING

Plastic surgery clinic in an institutional tertiary care center.

PATIENTS

Eight patients were included that presented with metopic suture abnormalities, age less than 1 year, and CT and STARscanner imaging within 30 days of one another.

MAIN OUTCOME MEASURES

Cranial measurements were collected twice from 3 scan types: STARscanner, CT windowed for soft tissue, and CT windowed for bone. Measurements included: intracranial volume, height, base width, maximum antero-posterior length, maximum medio-lateral width, and oblique diameters. Nested analysis of variance were performed to determine the proportion of error attributable to: between-subject variance, scan type, and rater.

RESULTS

Measurements from STARscanner and both CT scans windows were highly consistent, with less than 1% of total error attributable to scan type for all measures.

CONCLUSIONS

Cranial shape measurements obtained from STARscanner images are highly consistent with those obtained from CT scans. The STARscanner has added benefits of speed of acquisition, minimal cost, and lack of radiation.

Demographics of Positional Plagiocephaly and Brachycephaly; Risk Factors and Treatment

ABSTRACT

In the last 3 decades, the incidence of positional cranial deformations in infants, such as positional plagiocephaly and positional brachycephaly, has increased. The deviating shape often causes parental concern for the later psychosocial wellbeing of the child. Treatment options are nonoperative, varying from positional change to helmet therapy, of which the effect has often been debated. Multiple risk factors have been associated with an increased risk on the development of these deformations. The goal of this study was to assess the impact of known risk factors on the type and severity of resulting positional cranial deformation.Parents were asked to fill out a questionnaire regarding the presence of risk factors, such as gender, age, pregnancy duration, method of delivery and reasons for atypical deliveries, breech position, birth weight, developmental status, positional preference, family history, number of siblings, and torticollis presence. Treatment methods were documented and plagiocephalometry was used to measure the cranial proportions. All children were invited to participate in short-term follow-up. The significance of the risk factors and the effect of different kinds of therapy are discussed. Although no significant correlation was found between severity and risk factors, some risk factors could be correlated with the kind of positional cranial deformation. Of the different therapies, helmet therapy had a significant impact on the reduction of positional plagiocephaly.

The Effect of Cranial Shape on Esthetic Self-Worth in Bald Men

ABSTRACT

During the last 3 decades, the incidence of positional plagiocephaly and brachycephaly has increased. Treatment options are conservative and can include physiotherapy and molding helmet therapy. The decision to start therapy is based on patient history and subjective assessment of cranial shape by the physician and the parents. To determine the impact of these deformations on esthetic self-worth, as well as cranial shape, this study was conducted on a population of adult bald men.Participants were asked to fill in a questionnaire about the amount of comments received on cranial shape, as well as grade their general esthetic and grade craniofacial features using a visual analogue scale. The cranial proportions and symmetry were measured using plagiocephalometry.50 adult bald men were included in this study. The prevalence of nonsynostotic plagiocephaly was 12%; the prevalence of nonsynostotic brachycephaly was 0%. No significant correlation was found between plagiocephaly or brachycephaly, cranial circumference, width or length and amount of comments on cranial shape, cosmetic assessment of appearance or cosmetic assessment of cranial shape. On average, teeth and eyes were given the highest cosmetic value, eyebrows and chin were given the lowest scores.Cranial shape does not have a significant impact on the amount of comments received on cranial shape, nor the cosmetic assessment of either overall appearance or cranial shape in bald men. For bald men, eyes and teeth are more important craniofacial features in cosmetic assessment. There is no clear esthetic need to treat deviating cranial shape with helmet therapy in male patients.

Two-Dimensional Image-Based Screening Tool for Infants with Positional Cranial Deformities: A Machine Learning Approach

Positional cranial deformities are relatively common conditions, characterized by asymmetry and changes in skull shape. Although three-dimensional (3D) scanning is the gold standard for diagnosing such deformities, it requires expensive laser scanners and skilled maneuvering. We therefore developed an inexpensive, fast, and convenient screening method to classify cranial deformities in infants, based on single two-dimensional vertex cranial images. In total, 174 measurements from 80 subjects were recorded. Our screening software performs image processing and machine learning-based estimation related to the deformity indices of the cranial ratio (CR) and cranial vault asymmetry index (CVAI) to determine the severity levels of brachycephaly and plagiocephaly. For performance evaluations, the estimated CR and CVAI values were compared to the reference data obtained using a 3D cranial scanner. The CR and CVAI correlation coefficients obtained via support vector regression were 0.85 and 0.89, respectively. When the trained model was evaluated using the unseen test data for the three CR and three CVAI classes, an 86.7% classification accuracy of the proposed method was obtained for both brachycephaly and plagiocephaly. The results showed that our method for screening cranial deformities in infants could aid clinical evaluations and parental monitoring of the progression of deformities at home.

Reliability of optical devices for three-dimensional facial anatomy description: a systematic review and meta-analysis

The use of three-dimensional (3D) optical instruments to measure soft tissue facial characteristics is increasing, but systematic assessments of their reliability, practical use in research and clinics, outcome measurements, and advantages and limitations are not fully established. Therefore, a review of the current literature was performed on the reliability of facial anthropometric measurements obtained by 3D optical facial reproductions as compared to conventional anthropometry or other optical devices. The systematic literature search was conducted in electronic databases following the PRISMA guidelines (PROSPERO registration: CRD42018085473). Overall, 815 studies were identified, with 27 final papers included. Two meta-analyses were conducted. Tested devices included conventional cameras, laser scanning, stereophotogrammetry, and structured light. Studies measured living people or inanimate objects. Overall, the optical devices were considered reliable for the measurement of linear distances. Some caution is needed for surface assessments. All instruments are suitable for the analysis of inanimate objects, but fast scan devices should be preferred for living subjects to avoid motion artefacts in the orbital and nasolabial areas. Prior facial landmarking is suggested to improve measurement accuracy. Practical needs and economic means should direct the choice of the most appropriate instrument. Considering the increasing interest in surface-to-surface measurements, fast scan devices should be preferred, and dedicated protocols devised.