How close does an uncemented hip stem match the final rasp position?
During total hip arthroplasty the final clinical position of the cementless CLS stem (Centerpulse) is not always identical to the position of the final rasp with which a successful trial reduction was performed. Therefore, the rasp-stem correspondence of CLS system (Centerpulse) was investigated in a laboratory study and compared to the CBC-T system (Mathys). Both systems showed an average rasp-stem mismatch below 2 mm in three orthogonal directions. It was found that this mismatch related to geometric differences at the corners between rasp and stem. The measured mismatch is not expected to have adverse clinical consequences.
Barink
Marco
M
Orthopaedic Research Laboratory, University Medical Centre Nijmegen, Nijmegen, The Netherlands.
Meijers
Hjalmar
H
Spruit
Maarten
M
Fankhauser
Christoph
C
Verdonschot
Nico
N
D019644:Arthroplasty, Replacement, Hip; D001696:Biomechanical Phenomena; D001843:Bone Cements; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing; D008953:Models, Anatomic; D011474:Prosthesis Design; D011475:Prosthesis Failure; D017755:Prosthesis Fitting / Q000379:methods*; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical
D001843:Bone Cements