VALIDATION DATA

The modified UCLA Scale has single items measuring each domain, so internal consistency cannot be measured.

However, one study found that the Italian version of the UCLA Scale pain and function items had a high internal consistency, with a Cronbach’s α of more than 0.89, and both items correlated with the total score (r > 0.54).

Good test-retest reliability of the three self-reported items in the modified UCLA Scale has been reported in a mixed post–shoulder surgery population (N = 31) with mostly rotator cuff tears (n = 20) and instability (n = 9); results are as follows: for pain, ICC = 0.78 (95% CI 0.58-0.89); for function, ICC = 0.89 (95% CI 0.78-0.94); and for satisfaction ICC = 0.79 (95% CI 0.59-0.89).

No details on the method of development were published.

One study in patients undergoing rehabilitation post proximal humerus fracture assessed the content validity of the modified UCLA score linked to ICF codes. Apart from subjective shoulder value (‘not definable’), the items linked with the following two ICF components: body functions (pain, joint mobility, and muscle strength/endurance) and activities and participation (using transport/driving, self-care, dressing, shopping, and housework). All items linked with body functions were separate items, whereas all items in activities and participation were combined within a single item.