Table 2.

Features of proximal humeral fractures predictive of ischaemia

Criterion	Sensitivity	Specificity	Accuracy	Positive predictive value	Negative predictive value
Three fragments	0.36	0.40	0.38	0.43	0.34
Four fragments	0.62	0.73	0.67	0.74	0.61
Anatomic neck involvement	0.76	0.62	0.70	0.71	0.68
Calcar segment (< 8 mm)	1.00	0.64	0.84	0.77	1.00
Disrupted medial hinge (> 2 mm)	0.78	0.80	0.79	0.83	0.75
Tuberosity displacement (>10 mm)	0.69	0.51	0.61	0.63	0.58
Glenohumeral joint dislocation	0.22	0.82	0.49	0.60	0.46
Head-split	0.20	0.84	0.49	0.61	0.46
Anatomic neck + calcar < 8 mm	0.76	0.82	0.79	0.84	0.74
Anatomic neck + calcar < 8 mm + disrupted medial hinge	0.58	0.98	0.76	0.97	0.66

Note: Created using data from Hertel et al⁴²