Changes in periprosthetic bone remodelling after redesigning an anatomic cementless stem.
The aim of this prospective cohort study was to determine the densitometric relevance of minor design modifications of a cementless stem designed to improve proximal load transfer. We used a prospective cohort study with densitometric analysis over a five-year period of two groups of patients with primary osteoarthritis. The first group, 56 hips, received the first version of the ABG stem (ABG-I); the second group, 54 hips, had the ABG-II stem. The results obtained with the ABG-I stem showed a decrease of bone density in proximal areas that ranged from 13% to 37%. However, the new design had a decrease of the same areas that ranged from 9% to 23%. These differences were noted at the end of the first post-operative year and remained stable, except in zone 7, where they were progressive. There is little evidence that the modified stem reduces femoral bone density loss.
Panisello
Juan J
JJ
Department of Orthopaedic Surgery, University Hospital Miguel Servet, Zaragoza, Spain. mdelgadom@meditex.es
Canales
Vicente
V
Herrero
Luis
L
Herrera
Antonio
A
Mateo
Jesús
J
Caballero
María J
MJ
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001843:Bone Cements; D015519:Bone Density / Q000502:physiology; D016723:Bone Remodeling / Q000502:physiology*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010149:Postoperative Pain / Q000503:physiopathology; D011336:Probability; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013997:Time Factors; D016896:Treatment Outcome
D001843:Bone Cements