Fig. 2

Ultrasonographic measurements. a Percent total lesion (%T-Lesion) of autologous conditioned serum (ACS)-treated and control superficial digital flexor tendons (SDFTs) over time. b Total echo scores of ACS-treated and control SDFTs over time. c Total lesion cross-sectional area (TL-CSA) of ACS-treated and control SDFTs over time. Mean ± SE. *p < 0.05, between groups. Different letters (ACS normal, and control italic) indicate significant differences (p < 0.05) within treatment group. ACS-group, n = 10 limbs (SDFTs treated with a single injection of ACS); controls, n = 7 limbs (SDFTs treated with a single injection of control substance or left untreated). Black arrow day (d)0 – diagnosis, first tendon biopsy; red arrow d1 – intralesional injection of ACS/control substance; blue arrows d36/d190 – second/third tendon biopsy