title: Fixation of the NexGen HA-TCP-coated cementless, screwless total knee arthroplasty: comparison with conventional cementless total knee arthroplasty of the same type.
abstract: We performed a 12-month prospective study on 59 patients (92 knees) who underwent NexGen (Zimmer Inc, Warsaw, IN) cruciate-retaining total knee arthroplasty. In the control group, uncoated components were fixed using screws, whereas the hydroxyapatite-tricalcium phosphate (HA-TCP) group underwent screwless fixation of coated components. At 12 months postoperatively, there was a radiographic clear zone around the femoral and tibial components of 56.5% and 32.6% of the knees in the control group. The HA-TCP group showed a clear zone at the medial aspect of the tibial component in only 1 knee. These results suggested that HA-TCP-coated articular components show good initial fixation without using screws. The NexGen coated knee arthroplasty may be useful for solving the problems of cementless fixation.
authors.affiliation: Department of Orthopaedic Surgery, Nagano Matsushiro General Hospital, Nagano, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Gejo
authors.forename: Shaw
authors.initials: S
authors.lastname: Akizuki
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takizawa
mesh_terms: D000368:Aged; D001172:Arthritis, Rheumatoid / Q000503:physiopathology / Q000601:surgery; D019645:Arthroplasty, Replacement, Knee; D001863:Bone Screws; D002130:Calcium Phosphates; D016022:Case-Control Studies; D002484:Cementation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006882:Hydroxyapatites; D007719:Knee Joint / Q000503:physiopathology; D007720:Knee Prosthesis; D008297:Male; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery; D011446:Prospective Studies; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D013997:Time Factors
chemical_list: D002130:Calcium Phosphates; D006882:Hydroxyapatites; C094280:hydroxyapatite-tricalciumphosphate composite