eTable 2. Functional outcome.

Questionnaire	Time point after surgery	PEEK		Titanium
		Mean ± SD	Median (min–max)	Mean ± SD	Median (min–max)
OSS	6 weeks	20.3 ± 9.8	20.5 (3.0–40.0)	20.4 ± 8.5	21.5 (3.0–39.0)
	12 weeks	33.8 ± 10.0	35.5 (11.0–47.0)	33.3 ± 6.5	34.0 (17.0–48.0)
	6 months	37.7 ± 8.8	40 (15.0–48.0)	38.6 ± 6.8	39.0 (19.0–48.0)
SST	6 weeks	30.0 ± 20.8	29.2 (0.0–75.0)	29.4 ± 18.9	25.0 (0.0–75.0)
	12 weeks	54.9 ± 24.8	54.2 (8.3–91.7)	51.5 ± 16.5	50.0 (16.7–83.3)
	6 months	62.5 ± 22.3	61.8 (18.2–100)	65.0 ± 20.1	58.3 (16.7–100.0)
DASH	6 weeks	56.5 ± 19.3	56.9 (20.7–88.9)	59.8 ± 15.6	62.5 (19.8–85.3)
	12 weeks	38.4 ± 21.4	35.1 (1.7–79.3)	37.7 ± 16.2	35.8 (5.2–73.3)
	6 months	27.5 ± 20.5	22.4 (1.0–81.5)	28.5 ± 17.9	27.6 (1.7–69.8)

DASH, Disabilities of Arm, Shoulder and Hand; OSS, Oxford Shoulder Score; PEEK, polyetheretherketone; SD, standard deviation; SST, Simple Shoulder Test