Radiological validation of a fluoroscopic guided technique for femoral implant positioning during hip resurfacing.
OBJECTIVE
The positioning of the femoral cup in hip resurfacing is essential for the survival of the implant. We described a technique in 2005 to position the femoral cup guided by fluoroscopy independent of the approach performed. The main objectives were to study the positioning of the femoral components of the implant and the accuracy of the technique.


METHODS
Between 2003 and 2011 we conducted a prospective study of 160 consecutive hip resurfacings all operated with this fluoroscopic-guided technique. Three independent observers performed a radiographic analysis at the pre-operative planning stage and on postoperative radiographs using OsiriX software. The statistical analysis was based on comparison of two groups by Student's t test.


RESULTS
The entire implant was positioned in valgus, with an average of 7.816° valgus (p <0.001). All implants were positioned in neutral or anteverted with a mean of 1.98° (p <0.001). The risk of malpositioning on the antero-posterior plane was less than 1.41° with p <0.019. The risk of profile positioning error was lower than 0.80° with p <0.047.


CONCLUSIONS
This study validates a technique of femoral implant positioning for resurfacing. It is simple, precise and independent of the approach performed.
The Service de Chirurgie Orthopédique et de Traumatologie, Centre Hospitalier Universitaire de Rangueil, Toulouse, France.
Philippe
P
Chiron
Régis
R
Pailhé
Nicolas
N
Reina
David
D
Ancelin
Akash
A
Sharma
Laurent
L
Maubisson
Jean-Michel
JM
Laffosse
D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005269:Femur / Q000601:surgery*; D005471:Fluoroscopy; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D011446:Prospective Studies