Minimal Difference, if Any, in the Efficacy of Intramuscular vs. Intra-articular Steroid Injection for Knee Osteoarthritis
This study found that intra-articular glucocorticoid injection may work better for reducing pain from knee osteoarthritis at one month, but there was no significant difference in pain resolution between intra-articular injection and intramuscular injection at two months or six months.
Source: AmericanFamilyPhysician