What complications can occur if Diclofenac Sodium Inj. is injected in deltoid region

Its indicated on the Amp of Diclofenac Sodium inj. that its for injection in Gluteus region. What complications can be there if its injected in Deltoid region.
Thanks in Advance...

If a deltoid injection is placed too posteriorly, it may damage the axillary nerve, or selectively affected its anterior or posterior divisions, as they pass around the neck of the humerus underneath the deltoid muscle. Occasionally, the radial nerve itself may be damaged by the injection also. This can occur if it is placed to too caudal (near the spiral groove), or posterior where the radial nerve passes into the posterior compartment of the upper arm.

Additionally, all the conventional diclofenac sodium injections available in the market contains propylene glycol as a solvent, which makes the solution highly viscous and painful at the site of injection. Hence they are to be administered in the gluteal(buttock) region.