The Morscher Press-Fit Acetabular Component: An Independent Long-Term Review at 18-22 Years.
There are relatively few 20-year results of uncemented acetabular components, and most of these are modular designs. This study reports the 20-year results of a monoblock press-fit acetabular component.



A total of 122 total hip arthroplasties (111 patients) using the Morscher cup were reviewed at a mean of 19.7 years. The average age at implantation was 57.3 years (range, 36-74 years), and 81 (66%) were men.



Twenty-two patients (25 hips) had died. Seven hips were revised, including 5 acetabular revisions. Six patients (6 hips) declined to participate but were known not to have been revised. The mean Oxford hip score was 41.1 (range, 22-48), and the mean reduced Western Ontario and McMaster Universities Osteoarthritis Index score was 5.7/48 (range, 0-24). Eccentric wear was seen in 13 (15.7%) and major osteolysis in 14 (17%) of 82 surviving hips with radiographs. The all-cause revision rate was 0.32 per 100 observed component years (95% confidence interval [CI], 0.13-0.66). The 20-year Kaplan-Meier survival was 93.4% (CI, 86.6-96.8) for all-cause revisions, 95.5% (CI, 89.4-98.1) for any acetabular revision, and 97.1% (CI, 91.2-99.1) for acetabular aseptic loosening, wear, or osteolysis.



The Morscher acetabular component has continued to perform well at 20 years despite using conventional polyethylene with results that match or surpass other cementless acetabulae.
Department of Surgical Sciences, Orthopaedic Surgery, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand; Department of Orthopaedic Surgery, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand.
David P
DP
Gwynne-Jones
Department of Orthopaedic Surgery, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand.
Heath W R
HWR
Lash
Department of Orthopaedic Surgery, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand.
Andrew W
AW
James
Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand.
Ella E
EE
Iosua
Department of Orthopaedic Surgery, Dunedin Hospital, Southern District Health Board, Dunedin, New Zealand; Mercy Hospital, Dunedin, New Zealand.
John A
JA
Matheson
D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000009:adverse effects / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation / Q000706:statistics & numerical data
D020959:Polyethylene
long-term survivorship; monoblock; primary hip arthroplasty; radiographic outcomes; uncemented acetabulum