title: [Cement-free cup and cemented shaft--concept of a hybrid solution and results of a 3-to-6-year clinical experience].
abstract: Report about the Marburg Hybrid THA using a cementless cup and a cemented stem. The acetabular component consists of an hemispheric inner polyethylene cup and an outer five-layer sintered titanium wire mesh fused together. The socket is primarily anchored by one peg as well as 2 self-stabilizing titanium nails. The forged titanium alloy stems are meeting all the requirements of the latest biomechanic research. A total of 292 Hybrid THA were implanted in 273 patients from 1. 8. 1986 to 1. 1. 1989. 6 patients (2.1%) had to undergo THA exchange surgery (1 early, 3 late infections, 1 acetabular fracture after fall, 1 loosened stem). The clinical data of 62 patients (21.2%) had to be disregarded for various reasons. Thus the data of 212 (72.6%) implanted THA in 194 patients were analyzed. 204 of the analyzed THA (96.2%) judged the result of the operation as good or very good. Radiolucency at the bone-titanium-interface of the cementless cups was present in 60 of 212 cases (28.3%), in revision operations twice as often as in primary implantations. There were no signs of progression. Radiolucency at the bone-cement-interface of the cemented stems was present in 27 of 212 cases (12.8%), with radiolucencies > 1 mm only occurring in area 7 of Gruen (1979). The overall results are thus very promising and support the concept of a hybrid solution for THA.
authors.affiliation: Orthopädische Klinik, Philipps-Universitt Marburg.
authors.forename: M
authors.initials: M
authors.lastname: Helfen
authors.forename: U
authors.initials: U
authors.lastname: Malzer
authors.forename: P
authors.initials: P
authors.lastname: Peters
authors.forename: P
authors.initials: P
authors.lastname: Griss
authors.forename: G
authors.initials: G
authors.lastname: Himmelmann
authors.forename: E
authors.initials: E
authors.lastname: Weber
mesh_terms: D000328:Adult; D000368:Aged; D000497:Alloys; D001843:Bone Cements; D002516:Ceramics; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011183:Postoperative Complications / Q000209:etiology; D011474:Prosthesis Design; D011859:Radiography; D013525:Surgical Instruments; D014025:Titanium
chemical_list: D000497:Alloys; D001843:Bone Cements; C031462:titanium alloy (TiAl6V4); D014025:Titanium
vernacular_title: Zementfreie Pfanne und zementierter Schaft--Konzept einer "Hybrid-Lösung" sowie Ergebnisse einer drei- bis sechsjährigen klinischen Erfahrung.