EP6.10 Relationship Between Activity Levels and Patient Reported Outcomes in Individuals with Hip Dysplasia

Developmental dysplasia of the hip (DDH) reduces hip stability and increases osteoarthritis risk. [1,2] Many individuals with DDH are young and highly active but may limit activity and seek surgical intervention because of insidious pain. [3] While the focus in DDH research is often on variables affecting joint loading or motion, it is important to consider both biomechanical measures and patients’ perceptions of their physical function, pain, and mobility to fully understand the disease.

The objective of this study was to determine the relationships between measures of activity and patient reported outcome measures (PROMs) in patients prior to corrective surgery for DDH. PROMs and activity measures were collected from 10 pre-surgical patients with DDH with IRB approval. Average steps per day and active minutes per day were recorded for 7 consecutive days as patients wore wrist-worn devices (Fitbit Inspire 2). Active minutes were classified as Sedentary, Lightly, Fairly, or Very Active using Fitbit proprietary algorithms and minutes per day in each category were averaged across the 7-day period. Once during that week, participants completed PROMs including the International Hip Outcome Tool-12 and the National Institutes of Health Patient-Reported

Outcome Measure Information System Pain Interference, Mobility, Anxiety, Mental Health, and Physical Health subscales. Associations between PROMs and activity levels were tested using Spearman rank-order correlations. Higher activity levels had moderate to strong relationships with patient reports of physical function. Very Active minutes was moderately and strongly correlated with increased reports of physical health and mobility (ρ=0.57 and ρ=0.65, respectively). Consistent with general populations, higher activity is related to better physical health and mobility, even in patients with DDH who are symptomatic enough to be undergoing surgery. [4,5] We did not find strong correlations between mental health and activity, but it is important to note our small sample size and data from one time point.

Thus, it may become true that worse mental health is related to being sedentary. It is important to understand the relationships between activity levels and PROMs to help interpret biomechanical assessments of patients with DDH, which can help clinicians holistically treat these individuals and help predict their potential for recovery.

Acknowledgments: Funding provided by the National Institute of Health T32HD007434 and R01AR081881.

References: [1] Wyles Clin Orthop Relat Res 2017. [2] Ganz Clin Orthop Relat Res 2008. [3] Schmitz J Am Acad Orthop Surg 2020. [4] Cos J Med Internet Res 2021. [5]Golinelli J Patient-Rep Outcomes 2022.