Loosening and revision rates after total shoulder arthroplasty: a systematic review of cemented all-polyethylene glenoid and three modern designs of metal-backed glenoid

Table 4 Subgroup analysis according to the follow-up duration

Items	<36-month subgroup^a		36–72-month subgroup^b		>72-month subgroup^c
Items	PEG	MBG	PEG	MBG	PEG	MBG
Age (years)	66.7	64.8	66.9	67.3	65.3	62.7
Number of radiolucency (%)	38/439 (7.3%)	8/65 (12.3%)	20/229 (8.7%)	31/182 (17.0%)	296/709 (41.7%)	8/35 (22.9%)
Number of radiolucency (%)	P = 0.355		P = 0.015 *		P = 0.033 *
Number of loosening	2/420 (0.5%)	5/65 (7.7%)	19/1459 (1.3%)	17/269 (6.3%)	443/1306 (33.9%)	0/115 (0%)
Number of loosening	P < 0.001 *		P < 0.001 *		P < 0.001 *
Number of failure (=revision)	19/424 (4.5%)	4/65 (6.2%)	37/1503 (2.5%)	5/277 (1.8%)	133/1389 (9.6%)	2/115 (1.7%)
Number of failure (=revision)	P = 0.754		P = 0.829		P = 0.002 *

FU follow-up, PEG cemented all-polyethylene glenoid, MBG metal-backed glenoid
^afollow-up duration less than 36 months
^bfollow-up duration between 36 and 72 months
^cfollow-up duration more than 72 months
*statistically significant change

ISSN: 1471-2474