BPK-S Integration (Ceramic) Post Market Clinical Follow-Up

Inclusion Criteria: * Congenital or acquired knee joint defects/deformation which necessitate the implantation of a knee joint replacement * Defects or malfunctions of the knee joint * Degenerative, rheumatic, post-traumatic arthritis/arthrosis * Symptomatic knee instability * Reconstruction of flexibility * Patients with material hypersensitivity Exclusion Criteria: * Obesity or overweight of the patient * Acute or chronic infections near the implantation * Diseases that impair bone growth such as cancer, renal dialysis, osteopenia, etc. * Sensitivity to foreign matter in the implant materials * Bone tumors in the area of the implant anchoring * Illnesses which can be treated without using a knee implant * Lack of patient cooperation * Abuse of medication, drug abuse, alcoholism or mental disease * Pregnancy * Serious osteoporosis * Serious damage to the bone and soft tissue structures which impedes stable anchoring and joint function * Systemic diseases and metabolic disorders * Overload of the knee implant to be expected