Callus Formation in Fractured Femur of Rats Treated with Injection of Human Umbilical Cord Mesenchymal Stem Cell-Conditioned Medium

Table 1

Callus area measurement (mm²).

Day	Soft callus		Hard callus
	Control	MSC-CM	Control	MSC-CM
1	0	0	0	0
7	3.5	23.6	2.1	4.6
14	6.2	7.8	4.4	9.6
21	4.5	6.3	4.1	10.7
28	2.4	4	2.5	11.5
35	22.7	6.7	10^b	11.8^a
60	21	2.4	15.8^c	16.1^c

Days after fracture surgery. ^a, b, cSignificantly different ().