Femoral neck cut level affects positioning of modular short-stem implant.
A trend in total hip arthroplasty surgery has been to design more bone-preserving procedures, especially for younger patients. This study investigated the final implant positioning of a short metaphyseal femoral neck type of implant to determine whether leg length, caput collum diaphysis (CCD) angle, and offset could be re-created with different levels of femoral neck resection. Ten cadaveric hips in 6 whole-body specimens were used, with 3 fiducial markers to allow registration of computer navigation points to computed tomography scan data. Three femoral neck resection levels were investigated: 0 mm, +5 mm (the recommended level of resection), and +10 mm from the base of the femoral neck. Results showed that the CCD angle was significantly higher with 0-mm neck cut and the offset was lower, whereas the highest neck cut had longer leg-length results. Surgeons who use a short metaphyseal stem need to realize the importance of a proper femoral neck cut to restore anatomic parameters as well as the possible benefit of computer-assisted surgery to restore these anatomic parameters during surgery.
Mihalko
William M
WM
Campbell Clinic Orthopaedics, InMotion Orthopaedic Research Laboratory, University of Tennessee, Memphis, Tennessee 38017, USA.
Saleh
Khaled J
KJ
Heller
Markus O
MO
Mollard
Benoit
B
König
Christian
C
Kammerzell
Sergej
S
D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D002102:Cadaver; D005260:Female; D005272:Femur Neck / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D016896:Treatment Outcome