Retrospective Study of the Linear™ Hip

Inclusion Criteria: * Have hip joint disease related to one or more of the following * osteoarthritis * rheumatoid arthritis * femoral fracture * correction of a functional deformity * avascular necrosis of the natural femoral head * Skeletal maturity * Patient is likely to be available for evaluation for the duration of the study * Able and willing to sign the informed consent and follow study procedures * Patient is not pregnant * No infection present * No known materials sensitivity * Patient is over 18 years of age Exclusion Criteria: * Skeletal immaturity * Infection or sepsis * Insufficient bone quality that may affect the stability of the implant * Muscular, neurologic or vascular deficiencies which compromise the affected extremity * Alcoholism or other addictions * Prisoners * High levels of physical activity * Patient is pregnant * Loss of ligamentous structures * Materials sensitivity * Patient is under 18 years of age