What do systematic reviews say?

IM injection vs IA injection

IM injection showed no clear difference in amputation rate Assessed during in‐patient stay compared with IA injection (low certainty).

• Autologous cells derived from different sources and administered using different regimens for 'no‐option' critical… 2018 · Cochrane Headline outcomes only
  RR 0.8 [0.54, 1.18]
  3 studies · 95 participants
  Low