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. 2011 Mar;35(3):317-23.
doi: 10.1007/s00264-010-0954-3. Epub 2010 Feb 17.

Do large femoral heads reduce the risks of impingement in total hip arthroplasty with optimal and non-optimal cup positioning?

Gianluca Cinotti  1 , Niccolò Lucioli, Andrea Malagoli, Carlo Calderoli, Ferdinando Cassese
Affiliations

Do large femoral heads reduce the risks of impingement in total hip arthroplasty with optimal and non-optimal cup positioning?

Gianluca Cinotti et al. Int Orthop. 2011 Mar.

Abstract

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.

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Figures

Fig. 1
Fig. 1
Mathematical model generated by laser scanning of cadaveric hip joint with a total hip arthroplasty implanted. a Coronal view. b Sagittal view
Fig. 2
Fig. 2
Increase in the range of motion between the 38-, 28- and 32-mm femoral heads during combined motion of positions 1 and 2 in the presence of a cup anteversion of 5° (left side of graph) and 28° (right side of graph)
Fig. 3
Fig. 3
Increase in the range of motion between 38- and 28- and 32-mm femoral heads during combined motion of positions 1 and 2 in the presence of a cup inclination of 55° (left side of graph) and 35° (right side of graph)
Fig. 4
Fig. 4
Type of impingement with the different femoral heads. A significant difference was found between type of impingement with 28-mm and with 32-, 36-, and 38-mm femoral heads. C component, B bone
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