The effect of the Rim Cutter on cement pressurization and penetration on cemented acetabular fixation in total hip arthroplasty: an in vitro study.
The Rim Cutter (Stryker Orthopedics, Mahwah, New Jersey) is a tool designed to cut a ledge inside the rim of the acetabulum, onto which a precisely trimmed, cemented, flanged cup can be fitted. The aim was to investigate the effect of the Rim Cutter on the intra-acetabular cement mantle pressure and the depth of cement penetration during cup insertion. The study had two parts. In the first part, hemi-pelvis models were fitted with pressure sensors. Pressure in the acetabulum was measured on insertion of a conventional cemented flanged cup with and without the use of a Rim Cutter to prepare the rim of the acetabulum. The second part assessed cement penetration when the same cups were inserted into a foam shell model. The shell was mounted in a jig and had holes drilled in it; the distance that cement penetrated into the holes was measured. A significant increase in cement pressure at the apex (p = 0.04) and the rim (p = 0.004) is seen when the Rim Cutter is used. Cement penetration in the Rim Cutter group was significantly increased at the rim of the acetabulum (p = 0.003). Insertion of a flanged cup after the acetabulum is prepared with the Rim Cutter leads to a significant increase in cement pressure and penetration during cup insertion in vitro when compared with conventional flanged cups.
Gold Coast Hospital, Gold Coast Queensland, Australia.
B N
BN
Smith
A J C
AJ
Lee
A J
AJ
Timperley
S L
SL
Whitehouse
R W
RW
Crawford
D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001698:Biomedical Engineering; D001843:Bone Cements; D004867:Equipment Design; D006621:Hip Joint / Q000033:anatomy & histology / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D066298:In Vitro Techniques; D008953:Models, Anatomic; D011312:Pressure
D001843:Bone Cements