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SPS® System

Naturally anatomic

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The custom-made experience

Created in 1993, the SPS® stem is based on a worldwide unique concept, directly derived from the custom-made technology developed by Symbios.

 

 

years of clinical experience of the SPS® concept

%

Survie à 10 ans de recul pour cause de descellement aseptique (1)

Rotational guidance control

Impaction hole provided with a slotted guide to control rotation during impaction.

 

Flared external curvature

For direct contact with the external cortex.

 

Metaphyseal fixation

  • Porous titanium and hydroxyapatite coating in the metaphyseal zone.
  • Scale grooves for anchoring and stability in cancellous bone.

 

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Retroversion of the neck by 5°

To compensate for the anteversion of the sagittal anatomical curvature in the metaphysis.

Metaphyseal anatomical curvature

  • Anterior sagittal curvature.
  • Axial helix of 15°.
  • Natural adaptation to the medullary canal.

 

Distal part short and refined

To avoid pain associated with distal cortical conflict.

 

 
 

 

 

Anatomical

for metaphyseal blocking

 

Metaphyseal flare

The SPS® stem has a large flare angle in the metaphysis, to allow good control of the locking height in the proximal femur.

 

Sagittal anatomical curvature

The sagittal anatomical curvature allows better anteroposterior filling in the metaphysis to increase rotational stability and proximal load transmission, promoting bone remodeling.

Anatomical

for easy insertion.

 

Anatomical design for ease of insertion

  • Sagittal curvature allows for easy introduction for a wide variety of approaches, including minimally invasive anterior approaches.
  • External shoulder design designed to avoid conflict with the greater trochanter.

 

Short stem and thinned distal part

  • Naturally shorter than conventional stems to enable anatomical insertions following the anterior curvature of the femur.
  • Refined distal part to facilitate the introduction of the stem.

Anatomical

for controlled reconstruction

 

Retrospective development of design

The SPS® Evolution stem was introduced in 2012, and benefits from retrospective development of the design of the original SPS®:

 

  • Design revisited based on the analysis of hundreds of postoperative scans, which allowed the average prosthetic center of rotation to be determined in 3D.
  • Neck design adjusted to precisely match the average prosthetic center of rotation.

 

A complete range

Based on long-term clinical experience, the SPS® stem system allows the selection of the most suitable prosthetic offset for each case:
 

  • SPS® Evolution – CCD angle 129°.
  • SPS® HA – Angle CCD 134°.

Resources to download

(1) Sariali E, Mouttet A, Mordasini P, Catonné Y. High 10-year survival rate with an anatomic cementless stem (SPS). Clin Orthop Relat Res. 2012 Jul;470(7):1941-9.

(2) De Boer F A, Sariali E. Comparison of anatomic vs. straight femoral stem design in total hip replacement – femoral canal fill in vivo. Hip Int. 2017 May 12;27(3):241-244.

(3) Janssen L, Wijnands K A P, Jannsen D, Janssen M W H E, Morrenhof J W. Do Stem Design and Surgical Approach Influence Early Aseptic Loosening in Cementless THA? Clin Orthop Relat Res. 2018 Jun;476(6):1212-1220.

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