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Background The medial longitudinal arch of the foot is a variable structure, and a decrease in its height could affect several functions and increase the risk of injuries in the lower limbs. There are many different techniques for evaluating it. Objective The objective of this study was to evaluate the correlations of the Navicular Drop Test, several footprint parameters, and the Foot Posture Index-6 in people with a low medial longitudinal arch. Intrarater reliability and interrater reliability were also estimated. Design This was a repeated-measures, observational descriptive study. Methods Seventy-one participants (53.5% women; mean age = 24.13 years; SD = 3.41) were included. All of the parameters were collected from the dominant foot. The correlation coefficients were calculated. The reliability was also calculated using the intraclass correlation coefficient, 95% CI, and kappa coefficient. Results Statistically significant correlations were obtained between the Navicular Drop Test and the footprint parameters, with r absolute values ranging from 0.722 to 0.788. The Navicular Drop Test and the Foot Posture Index-6 showed an excellent correlation (Spearman correlation coefficient = 0.8), and good correlations (Spearman correlation coefficient = |0.663–0.703|) were obtained between the footprint parameters and the Foot Posture Index-6. Excellent intrarater reliability and interrater reliability were obtained for all of the parameters. Limitations Radiographic parameters, the gold standard for evaluating the medial longitudinal arch height, were not used. In addition, the results of this research cannot be generalized to people with normal and high medial longitudinal arches. Conclusions In participants with a low medial longitudinal arch, the Navicular Drop Test showed significant correlations with footprint parameters; correlations were good for the arch angle and Chippaux-Smirnak Index, and excellent for the Staheli Index. The Foot Posture Index-6 showed an excellent correlation with the Navicular Drop Test and a good correlation with the footprint parameters evaluated. All of the parameters showed high reliability.

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Relevance: It is well documented that when caring for children with Osteogeneses Imperfecta (OI), a skeletal dysplasia of which the most common feature is recurrent fractures with little trauma, a multidisciplinary collaborative working approach placing the child and their family at the centre of care is best practice. To achieve this Health Care Professionals (HCP's) need to acquire insight into the lived experience of having OI. This is challenging especially considering the variation in its presentation both within and across the different types, of which there are currently 18. As mothers are the main care giver, exploring their lived experience can offer HCP's insight into how they perceive and understand OI. This insight can aid the HCP's in forming collaborative working with the mother, positively influencing the child with OI's care.Purpose: The aim of this study was to explore the phenomenon of a mothers lived experience of having a child with OI. The specific focus of the study was on the relationships each mother builds both within and outside the family unit and how these alongside her experience and perception of OI influenced her present and future expectations for her child.Methods/analysis: A qualitative methodology was employed. Eight mothers were purposefully sampled. The sample size was derived from previous qualitative research in the area of interest. Each mother completed a semi-structured interview, which was digitally recorded and transcribe verbatim. The transcripts were analysed using template analysis. Ethical approval was obtained from the School of Health and Related Research Ethics Committee at the University of Sheffield.Results: The analysis reviled four higher level themes: the multi-faceted role of mothers; a mother's comprehension of OI; a mother's relationship's and a mother's contemplation of the future. These four higher level themes were all permeated by the integrated theme of balance.Discussion and conclusions: Many the findings echoed research conducted in other long term paediatric conditions. However the need to decrease fracture risk seems to be unique to OI. To facilitate engagement the research suggests that HCP's should recognise how a mother's own perception of OI, established from the relationships she constructs, her own experiences and understanding of the condition, impacts on her expectations of her child. Influencing her engagement with HCP's and ultimately her child's health outcome. This study is trustworthy and creditable but lacks some transfer-

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