Migration of hydroxyapatite coated femoral prostheses. A Roentgen Stereophotogrammetric study.
We allocated randomly 27 patients undergoing 28 primary uncemented total hip replacements (THR) to receive prosthetic components of similar design with either plasma-sprayed titanium alloy (Ti) coating (n = 13) or hydroxyapatite (HA) coating (n = 15). After some exclusions, 15 of the patients (15 THR; 7 with HA- and 8 with Ti-coating) were followed by roentgen stereophotogrammetric analysis at 3, 6 and 12 months to measure migration of the femoral component. Twenty-six of the patients (26 THR) were followed clinically and by conventional radiography. All the femoral components had migrated at 3 months. From 3 to 12 months, the migration of Ti-coated components continued whereas the HA-coated components had stabilised. At 12 months there was significantly less migration of the HA-coated components (p < 0.05). The maximum subsidence was 0.2 mm in both groups. The Harris hip score was equal in the two groups preoperatively but at follow-up it was better in the HA-coated group (p < 0.05) and visual analogue scale scores showed that they had less pain (p < 0.05).
Department of Orthopaedic Surgery, Aarhus Kommunehospital, Denmark.
K
K
Søballe
S
S
Toksvig-Larsen
J
J
Gelineck
S
S
Fruensgaard
E S
ES
Hansen
L
L
Ryd
U
U
Lucht
C
C
Bünger
D000368:Aged; D000369:Aged, 80 and over; D017886:Durapatite; D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D006882:Hydroxyapatites; D008422:Materials Testing; D008875:Middle Aged; D010003:Osteoarthritis / Q000628:therapy*; D010780:Photogrammetry; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D013499:Surface Properties; D014025:Titanium; D016896:Treatment Outcome
D006882:Hydroxyapatites; D017886:Durapatite; D014025:Titanium