Avascular Necrosis (AVN) Long-Term Follow-up

Inclusion Criteria: * Patient qualifies for core decompression based on physical exam * No history of core decompression * Patient is willing and able to provide written informed consent Exclusion Criteria: * Patient has been diagnosed as Stage 0, III, IV, V or VI using the Steinberg/UPenn staging system. * Patient's BMI is \>40 * Patient is mentally compromised * Patient has neurological condition in ipsilateral or contralateral limb, which affect lower limb function * The patient has had a proximal femoral osteotomy or internal fixation in the affected hip. * The patient has undergone previous treatment for AVN * Previous hip conditions * Patient's bone stock is insufficient * Patient has diagnosed systemic disease * Patient is a pregnant female * Patient is unable or unwilling to attend postop follow-up visits * Patient has received investigational drug within the previous 6 months or an investigational device within the last 12 months * Patient has an active or latent infection * Patient has metal sensitivity * Patient is a prisoner