ESOP anatomical modular cementless stem

The ESOP femoral stem was developed in 1991 in order to match the shape of the femoral stem to the shape of the patient’s bone.

This stem has 2 components:
– a flared metaphyseal portion coated with hydroxyapatite,
– a diaphyseal portion made of anodised titanium.

Product line

The ESOP product line of anatomical modular cementless femoral stems consists of 10 metaphysis sizes for each side and 7 standard diaphysis lengths. This comprehensive set of implants provides 70 possible left and right combinations intra-operatively.

It is based on the principle of adapting the implant to the patient’s femur shape, and not the other way around.

Features and materials

The ESOP stem is made of titanium alloy (TA6V ELI).

The metaphyseal component has a hydroxyapatite coating and is available in 10 left sizes and 10 right sizes ranging from 5 to 20.

The offsets and neck lengths increase as a function of the size.

The cylindrical neck has a 12/14 taper for use with alumina ceramic femoral heads; the neck-shaft angle is 135°.

The diaphyseal component is made of anodised titanium alloy. There are 7 different sizes of the standard diaphyseal component ranging from 9 to 15 mm in diameter.


The ESOP instrumentation can be used with all the standard surgical approaches. Rasp holders are available for the posterior and anterior routes.


  1. Garcia-Rey, E., et al., Results of a hydroxyapatite-coated modular femoral stem in primary total hip arthroplasty. A minimum 5-year follow-up. J Arthroplasty, 2008. 23(8): p. 1132-9.
  2. Naudi, S., et al., [Hydroxyapatite-coated Esop modular femoral stem: three to ten year outcome in 155 cases]. Rev Chir Orthop Reparatrice Appar Mot, 2007. 93(3): p. 247-54.
  3. Philippe, M.P., et al., The ESOP-HA modular cementless femoral stem: a study of the results of 165 hip arthroplasties with a minimum of 10-year follow-up. European Journal of Orthopaedic Surgery & Traumatology, 2005. 15(4): p. 275-285.
  4. Philippe, M., et al., Proximal Modularity in a Cementless HA-Coated Hip Replacement Assessment of Utility. Fifteen Years of Clinical Experience with Hydroxyapatite Coatings in Joint Arthroplasty. 2004.
  5. Gacon, G., et al., [Metaphyseal and diaphyseal modular femoral stems implanted without cement]. Rev Chir Orthop Reparatrice Appar Mot, 2001. 87(4): p. 331-9.