Table II.

Demographic data of the pooled cohort.

Variable	Reported studies (n = 112)	Shoulders with available data (n = 5,379)	Result		%
Mean age at revision, yrs (range)	105*	5,225	67 (21 to 84)
Mean follow-up, mths	107†	3,609	48
Sex	101‡	4,862	Female	2,925/4,862	60
			Male	1,910/4,862	40
Index surgery	100§	3,295	Hemiarthroplasty	1,645/3,295	50
			Anatomical TSA	1,152/3,295	35
			Revere TSA	402/3,295	15
Revision surgery	109¶	5,004	Reverse TSA	3,341/5,004	67
			Anatomical TSA	1,213/5,004	24
			Hemiarthroplasty	348/5,004	7
			Resection arthroplasty	43/5,004	<1
			Antibiotic spacer implantation	41/5,004	<1
Indication for revision surgery	90**	3,041	Component loosening	601/3,041	20
			Instability	577/3,041	19
			Rotator cuff failure	528/3,041	17
			Infection	490/3,041	16
			Glenoid failure	401/3,041	13
			Baseplate failure	83/3,041	3
			Pain and stiffness	62/3,041	2
			Fracture sequelae	59/3,041	2
			Periprosthetic fracture	58/3,041	2
			Tuberosity resorption	18/3,041	< 1

^*Age was not reported in seven studies. ^20-26

^†Mean follow-up duration was not reported in four studies,^23,27-29 all of which included cohorts followed up for longer than 24 months and one study¹⁹ included a cohort that was not followed up.

^‡Sex of patients undergoing revision was not reported in 11 studies. ^23-36,30-36

^§Index surgery was not reported in 12 studies. ^{19,24,26,28,37-44}

^¶Revision surgical procedure was not reported in three studies.^26,41,42

^**Indication for revision surgery was not reported in 22 studies. ^{19,20,23,24,27,30,32,34-54,44-54}

TSA, total shoulder arthroplasty.