Background: Patellar mobility is often routinely assessed in people with patellofemoral pain (PFP) in clinical practice. This study assessed the stability of measuring patellar mobility using the total medial-lateral patellar glide test across multiple repetitions. It also compared patellar mobility of people with healthy knees to people with PFP and subgroups of PFP. Methods: Twenty-two people without knee problems underwent five repetitions of the total medial-lateral patellar glide test. Differences in mean value for each repetition and the intra-class correlations (ICC) between the first assessment and the estimated average values of additional repetitions were estimated. Mean patellar mobility was compared with 127 participants with PFP who took part in a previously published subgrouping study. Differences between the healthy knee group and PFP subgroups were explored using a one-way ANOVA with pairwise comparisons. Results: The mean patellar mobility in healthy individuals was 16.4 mm (SD 5.3), difference in mean patellar mobility across repetitions was minimal and the ICC ranged between 0.93 and 0.95. People with PFP had significantly lower patellar mobility than the healthy knee group. Two of three PFP subgroups had statistically significantly lower mean patellar mobility (difference in mean-5.6mm and-6.5mm; P<0.001). Conclusions: A single medial-lateral patellar glide test appears as informative as repeated tests in practice. Evidence of patellar hypomobility in two subgroups of adults with PFP may help guide treatment in clinical practice. Contribution of the Paper: A one off measure of the total medial-lateral patellar mobility is as accurate as the average of multiple measures.
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