Benefit of Orthopedic Navigation in the ARThroplasty of the Hip

Inclusion Criteria: * Indication for primary cementless total hip endoprosthesis implantation with Bicontact stem and Plasmacup * Diagnoses: primary or secondary coxarthrosis, rheumatoid arthritis, femoral head necrosis * Age ≥ 50 Years * ASA score \<4 * Patient signed the informed consent Exclusion Criteria: * Excessive damage to the hip joint (e.g. dysplasia) * Severe deformities of the pelvis, femoral bone or knee * Unfeasibility of landmark palpation (e.g. due to adiposity) * Acute or chronic infection * Pregnancy * Patients not available for follow-up-examination at the center * Patients exceeding 10 mSv effective radiation dose because of previous scientific or clinical exposition during the past 10 years