2025 ISAKOS Biennial Congress ePoster
Initial Results from the Creation of a Normative Database for the Banff Patellar Instability Instrument
Mark Lafave, PhD, CAT(C) CANADA
Laurie A. Hiemstra, MD, PhD, FRCSC, Dead Man's Flats, AB CANADA
Sarah Kerslake, BPhty, MSc, Banff, Alberta CANADA
Daniel Stolear, MA, Calgary, Alberta CANADA
Mount Royal University, Calgary, AB, CANADA
FDA Status Not Applicable
Summary
The mean BPII 2.0 score for this small 'normal sample population' was 75.8 (SD = 23.7), however, a more diverse sample is needed.
ePosters will be available shortly before Congress
Abstract
Background
The Banff Patellar Instability Instrument (BPII) was introduced in 20131 and underwent factor analysis and item reduction in 2016.2 The BPII is a disease-specific patient reported outcome measure (PROM) that measures quality of life (QOL) for patients with patellar instability. The BPII has undergone a number of validity and reliability tests with our own research team3–5 as well as six cross-cultural validation studies internationally including German,6 Norwegian,7 Swedish,8 Indonesian,9 Turkish,10 Dutch,11 and Portuguese.12
Most BPII validation studies have measured responsiveness, also known as a comparison of patients to themselves over time (i.e.; evaluative research). No studies have compared patients to a normative standard since no normative database exists. Moreover, Balcarek et al14 pointed out that they could not make a full psychometric assessment of the BPII 2.0 because there was no normative reference data to compare their patients scores to. When a patient is compared to a “normal” population, the level of improvement may or may not be as profound or meaningful.13 Therefore, the primary goal of this study is to collect a diverse and representative sample of North American society’s (Canada and US) QOL using the BPII 2.0 to build a database that can act as a reference point and comparison for future studies.
Methods
Qualtrics© was contracted to collect the normative data using their standard panel recruitment process. Qualtrics© screened the normal population to ensure no one had ever sustained any knee injury previously. Panel member participants were compensated according to the Qualtrics© standards. Age, gender, country, and ethnicity stratifications were targeted to ensure there was equal and diverse population sampling methods. This study was approved by MRU HREB #101935.
Results
This abstract is presenting the initial results collected between January 1, 2024 and January 31, 2024. The rationale for stopping the collection at this stage is to inventory the age and ethnicity categories to ensure we target future data collection gaps that are representative of population-level data stratifications. Therefore, these initial data do not represent true population-level distributions, but rather are based on this initial data collection period. The descriptive data will help to contextualize these data accordingly. There were 320 total participants, 187 (58.4%) females, 129 (40.3%) males and 4 (1.3%) who preferred not to say. The mean age was 36.3 (SD = 14.0). The ethnicity breakdown by grouping is as follows: Asian – 5.3%; Black – 20%; Hispanic/Latino – 26.9 %; White – 25.3%; Other and mixed races – 22.5%. There were 41.3% from Canada and 58.8% from the USA. The mean BPII 2.0 score for this group was 75.8 (SD = 23.7).
Discussion
These initial results demonstrate some gaps in the population stratifications that are important to be truly representative a normal North American population. The remainder of data collection will target population-based data collection to ensure it is representative and can be classified as a “normal population.”