Primary hip stems

The Profemur® line of primary hip stems has an established clinical history. Each Profemur® hip stem offers its own philosophy to provide fixation and replace bone anatomy.

Profemur® Xm® hip stem

Cemented stem philosophy

Designed with a highly polished surface for cemented hip replacements, the Profemur® Xm hip stem features dual taper geometry to promote cement engagement and enhance rotational stability. The highly polished, forged CoCr stem minimizes friction so the cement-implant interface discourages potential for wear. Radial compressive loading is optimized by design thanks to rounded edges on the stem. And a distal centralizer is used to allow distal stem engagement within the cement mantle.

Not all products and options are available in all countries. This product is not marketed/registered in United States.

Design features

Taper-slip
- Stem acts as an extruder of cement into and onto the endosteal bone surface.¹
- Stem distally moves within the cement mantle, without disruption of the cement-bone interface.^2,4
- Accommodates cement creep and stress relaxation in the cement mantle.⁶
Dual taper geometry
- Promotes cement engagement and provides rotational stability.
- “Force Closed Fixation”: Transmission of load from the stem’s proximal part onto the femur.⁵
Highly polished, forged CoCr surface
- Complements the taper engagement by reducing abrasion at the stem/cement interface.³
Rounded edges
- Promotes radial compressive loading.
2 types of hollow-pocket centralizers – with/without wings
- Allow distal stem engagement within the cement mantle and to prevent end-bearing.
Modular neck technology
- Avoids compromising in stem positioning within the cement mantle⁹

Product options

Sizes 0–4
Highly polished CoCr surface
Modular necks

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PRECAUTIONS & DISCLAIMERS

Every patient is different, and individual results will vary. There are risks and recovery times associated with surgery.

Not all products and options are available in all countries.

References
1. Fowler Jl et al, Experience with the Exeter total hip replacement since 1970. Orthop Clin North Am. 1988 Jul; 19(3): 477-89
2. Baillon R et al, Validation of a new in vivo measurement method to measure subsidence of a cemented Exeter femoral stem. Rev Chir Orthop Reparatrice Appar Mot, 2004 May;90(3):232-40;
3. Alfaro-Adrian J, Gill HS, Murray DW “Cement migration after THR. A comparison of charnley elite and Exeter femoral stems using RSA” J Bone Joint Surg Br 1999 Jan; 81(1):130-4
4. Dunne NJ, Orr JF, Beverland DE “Assessment of cement introduction and pressurization techniques” Proc Inst Mech Eng [H]. 2004;218(1):11-25
5. Huiskes R, Verdonschot N, Nivbrandt B “Migration, stem shape, and surface finish in cemented total hip arthroplasty” Clin Orthop 1998 Oct(355): 103-12
6. S. Hook et al. The Exeter Universal stem A Minimum Ten-year Review From An Independent Centre. J Bone Joint Surg [Br] 2006;88-B:1584-90
7. Ling, Robin S.M. and Charity, John and Lee, A.J. Clive and Whitehouse, Sarah L. and Timperley, A. John and Gie, Graham A. (2009) The long term results of the original Exeter polished cemented femoral component : a follow-up report. Journal of Arthroplasty, 24(4). pp. 511-517
8. Scheerlinck T., Casteleyn P., The design features of cemented femoral hip implants. J Bone Joint Surg [Br] 2006;88-B:1409-18
9. Simpson DJ1, Little JP, Gray H, Murray DW, Gill HS., Effect of modular neck variation on bone and cement mantle mechanics around a total hip arthroplasty stem. Clinic Biomech 2009 Mar;24(3):274-85.

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Primary hip stems

Profemur® Xm® hip stem

Cemented stem philosophy

Design features

Product options

Joint MicroPort Academy

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