Inclusion Criteria:
* Patient capable of understanding the surgeon's explanations and following his instructions, able and willing to participate in the follow-up program and who gave consent to take part in the study.
* Patient aged of 18 years or more whose skeleton reached bone maturity.
* Noninflammatory degenerative joint disease including osteoarthritis and avascular necrosis.
* Rheumatoid arthritis.
* Correction of functional deformity.
* Treatment of non-union, femoral neck fracture, and trochanteric fractures of the proximal femur with head involvement, unmanageable by other techniques.
* Revision procedures where other treatment or devices have failed.
Inclusion criteria specific for patients receiving the G7 BiSpherical Shell with the G7 Freedom Constrained Liner:
* The Biomet G7 Freedom Constrained Liner is indicated for use as a component of a total hip prosthesis in primary and revision patients at high risk of dislocation due to a history of prior dislocation, bone loss, joint or soft tissue laxity, neuromuscular disease, or intraoperative instability, and for whom all other options to con-strained acetabular components have been considered.
Exclusion Criteria:
Absolute exclusion criteria include:
* Infection, sepsis, osteomyelitis.
Relative exclusion criteria include:
* Uncooperative patient or patient with neurologic disorders who is incapable of following directions.
* Osteoporosis.
* Metabolic disorders which may impair bone formation.
* Osteomalacia.
* Distant foci of infections which may spread to the implant site.
* Rapid joint destruction, marked bone loss or bone resorption apparent on roentgenogram.
* Vascular insufficiency, muscular atrophy or neuromuscular disease.
* Patient unwilling or unable to give consent, or to comply with the follow-up program.
* Patient known to be pregnant or breastfeeding.
* Patient presenting any condition that would, in the judgment of the Investigator, place the patient at undue risk or interfere with the study.
* Patient institutionalized or known drug abuser or alcoholic or anyone who cannot understand what is required of them.
* Patient belonging to a vulnerable population.
Exclusion criteria specific for patients receiving the G7 BiSpherical Shell with the G7 Freedom Constrained Liner:
* Bone or musculature compromised by disease, infection, or prior implantation that cannot provide adequate support or fixation for the prosthesis.
