title: [Surgical Techniques for Patella Replacement in Cases of Deficient Bone Stock in Revision TKA].
abstract: The patella replacement in revision surgery is a challenge especially in cases of unsufficient bone stock. Depending on the extent of the bone defect, the following videos demonstrate different approaches: Video 1: bone sparing removal of the patella implant: onlay-type patella implants. Video 2: complete cortical bone rim of the patella, residual thickness between 6 to 10 mm: biconvex patella implant. Video 3 and 4: small defects of the cortical bone rim of the patella, residual thickness 1 to 5 mm (patella shell): gull-wing osteotomy, patella bone grafting techniques. Video 5: partial necrosis/defect of the patella shell with incomplete cortical bone rim: porous tantalum patella prosthesis. On account of the various surgical options for different bone defects of the patella, patellectomy and pure patelloplasty should be avoided to prevent functional shortcomings.
authors.affiliation: Orthopädische Abteilung, Orthopädisches Krankenhaus Gersthof, Wien, Österreich.
authors.forename: P
authors.initials: P
authors.lastname: Ritschl
authors.affiliation: Orthopädische Abteilung, Orthopädisches Krankenhaus Gersthof, Wien, Österreich.
authors.forename: F
authors.initials: F
authors.lastname: Machacek
authors.affiliation: Orthopädische Abteilung, Orthopädisches Krankenhaus Gersthof, Wien, Österreich.
authors.forename: L
authors.initials: L
authors.lastname: Strehn
authors.affiliation: Orthopädische Abteilung, Orthopädisches Krankenhaus Gersthof, Wien, Österreich.
authors.forename: J
authors.initials: J
authors.lastname: Kloiber
mesh_terms: D000465:Algorithms; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D018786:Bone Substitutes / Q000627:therapeutic use*; D016025:Bone Transplantation / Q000379:methods*; D003131:Combined Modality Therapy / Q000295:instrumentation / Q000379:methods; D006801:Humans; D010027:Osteotomy / Q000379:methods*; D010329:Patella / Q000601:surgery*; D019651:Plastic Surgery Procedures / Q000379:methods*; D012086:Reoperation / Q000379:methods
chemical_list: D018786:Bone Substitutes