Cementless Alumina-Alumina Total Hip and Hybrid

Inclusion criteria

• Patients with inflammatory tissue disorders (e.g. rheumatoid arthritis, lupus, etc), osteoarthritis, post-traumatic arthritis or secondary arthritis, or avascular necrosis.
• Less than 70 on preoperative HHS score
• Primary total hip replacement
• Patient is likely to be available for evaluation for the duration of the study.

Exclusion criteria

• Patients with physical conditions that would eliminate adequate implant support or prevent the use of an appropriately sized implant (e.g., tumor)
• Previous surgery that has adversely affected bone stock (such as some hip pinning or some osteotomies) or prior total hip replacement.
• Insufficient quality or quantity of bone resulting from conditions such as:

• Cancer, where radiation has destroyed the available bonestock
• Congenital dislocation
• Metabolic bone disease of the upper femur or pelvis
• Femoral osteotomy revision
• Girdlestone revision
• Active infection of the hip joint
• Old or remote infection
• Other conditions that lead to inadequate skeletal fixation
• Neurological conditions that might hinder patient's ability to follow study procedures, e.g., to restrict physical activities (e.g., Severe Parkinson's, CVA on affected side)
• Patient's mental condition that may interfere with his ability to give an informed consent or willingness to fulfill the required follow-up of the study

• Mental illness
• Senility
• Drug Abuse
• Alcoholism
• Conditions that place excessive demands on the implant

• Charcot's joints
• Muscle deficiencies
• Multiple joint disabilities
• Refusal to modify postoperative physical activities
• Skeletal immaturity
• Obesity (50% over recorded body weight mass index)
• Greater than or equal to 70 on preoperative HHS score