*3.3. XRD Analysis*

To confirm the crystalline form of CaP was deposited on the surface of MSC-Scaffold pre-prototypes due to electrochemical treatment using VECD = −5.00 V, an XRD analysis was performed. The results are shown in Figure 9.

**Figure 9.** XRD pattern of the MSC-Scaffold pre-prototype coated with a layer of CaP deposited by ECDV=const at VECD = −5.00 V (followed by 48 h immersion in SBF).

As one can see, the obtained CaP coating is multiphasic and there are identified peaks attributed to CaP phases like octacalcium phosphate, Ca8H2(PO4)6·5H2O (PDF2# 00-026-1056), calcium metaphosphate, Ca(PO3)2 (PDF2# 00-003-0348), and monocalcium phosphate monohydrate, Ca(H2PO4)2·H2O (PDF2# 00-003-0284). Apart from this, the impurity phases from the SBF solution were found on the surface sodium chloride, NaCl (PDF2# 01-077-2064), and sodium hydrogen carbonate, NaHCO3 (PDF2# 00-021-119). The results of the XRD investigation showed that, during the combined ECD process conducted under the determined conditions, CaP biomineral coating is produced on the lateral surface of spikes of the MSC-Scaffold.
