Do large femoral heads reduce the risks of impingement in total hip arthroplasty with optimal and non-optimal cup positioning?
The purpose of this study was to assess whether large femoral heads (36-38 mm) improve the range of motion in total hip arthroplasty compared to standard (28-32 mm) femoral heads in the presence of optimal and non-optimal cup positioning. A mathematical model of the hip joint was generated by using a laser scan of a dried cadaveric hip. The range of motion was assessed with a cup inclination and anteversion of reference and with non-optimal cup positions. Large femoral heads increased the range of motion, compared to the 28-mm femoral head, in the presence of a hip prosthesis correctly implanted and even more so in the presence of non-optimal cup positioning. However, with respect to the 32-mm femoral head, large femoral heads showed limited benefits both in the presence of optimal and non-optimal cup positioning.
Orthopaedic Department, University La Sapienza, Rome, Italy. md3581@mclink.it
Gianluca
G
Cinotti
Niccolò
N
Lucioli
Andrea
A
Malagoli
Carlo
C
Calderoli
Ferdinando
F
Cassese
D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005270:Femur Head; D006621:Hip Joint / Q000503:physiopathology / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D004204:Joint Dislocations / Q000503:physiopathology / Q000517:prevention & control; D008953:Models, Anatomic; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016059:Range of Motion, Articular / Q000502:physiology*