Medial comminution as a risk factor for the stability after lateral-only pin fixation for pediatric supracondylar humerus fracture: an audit

Figures & data

Figure 1 Pin separation was calculated using the formula: (B/A) × 100.

Figure 2 Examples of medial comminution and the lack of cortical contact on medial column in anteroposterior radiography.

Table 1 Demographic data of Groups I (patients with medial comminution) and II (patients without medial comminution)

	Group I	Group II	P-value
Male:female	14:16	28:19	0.427
Age (years), mean ± SD	5.9 ± 2.1	5.6 ± 2.5	0.716
Body mass index (kg/m^2), mean ± SD	15.7 ± 2.5	15.5 ± 2.5	0.712
Pin number, n (min, max)	3 (3, 4)	3 (2, 4)	0.336
Pin separation at fracture site (%), mean ± SD	33.8 ± 5.4	38.1 ± 6.9	0.017

Table 2 Factors related to the changes in Baumann angle using multivariable logistic regression

Variables	Odds ratio	95% confidence interval		P-value
		Lower	Upper
Sex	2.054	0.635	6.645	0.230
Age	0.759	0.431	1.337	0.340
Body mass index	1.414	0.578	3.460	0.448
Pin number	1.859	0.537	6.438	0.328
Medial comminution	4.151	1.249	13.800	0.020

Figure 3 Due to medial comminution (white arrow), medial pin is more vertical than ideal position (dotted line).