Children less than 3 years receive 0.25mL, those after 3 years receive 0.50mL.
Young children are immunized in the anterolateral aspect of the thigh - which could have varying positions in relation to the knee, depending on the person. It certainly is possible that the area that was injected was the correct area.
I cannot comment on whether the vaccine was placed correctly or not without being familiar with the case.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b