Primary study · included by 1 review

Risk factors for free flap failure: a retrospective analysis of 881 free flaps for head and neck defect reconstruction.

Zhou 2017 · Zhou W, Zhang W-B, Yu Y, et al. · International journal of oral and maxillofacial surgery · 2017

Included by

Incidence and risk factors for postoperative vascular crisis in patients with oral and maxillofacial cancer: a systematic review and meta-analysis.

Non-Cochrane · prognostic · 2026 · cited as Zhou 2017 · Table 1; Fig. 2 (incidence forest plot)

Outcome this study informs	Pooled effect	Evidence	Certainty
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 16.11 [10.31, 21.91]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 14.41 [10.23, 18.59]	27 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 19.6 [15.1, 24.0]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 10.66 [5.31, 16.01]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 7.25 [2.31, 12.19]	3 studies	GRADE not reported
Incidence of postoperative vascular crisis Not applicable (pooled incidence) vs Not applicable · Postoperative (diagnostic windows varied: 72 h, 3 days or 7 days)	Pooled incidence (proportion) 0.14	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 15.31 [10.53, 20.09]	24 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 5.23 [1.75, 8.71]	4 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 16.08 [11.06, 21.11]	23 studies	GRADE not reported

1 including review in total.