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High incidence of intraoperative calcar fractures with the cementless CLS Spotorno stem

  • Carla Timmer
  • Davey M. J. M. Gerhardt
  • Enrico de Visser
  • Marinus de Kleuver
  • Job L. C. van SusanteEmail author
Original Article • HIP - ARTHROPLASTY

Abstract

Introduction

This study reports on the incidence of intraoperative calcar fractures with the cementless Spotorno (CLS) stem, and the potential role of a learning curve and implant positioning is investigated.

Methods

After introduction of the CLS stem, 800 consecutive cementless total hip arthroplasties (THA) were analyzed. The incidence of calcar fracture in the first 400 THA was compared with the second 400 THA, in order to study a potential learning curve effect. According to the instruction for users, varus positioning of the stem was avoided and a femoral neck osteotomy was aimed relatively close to the lesser trochanter since these are assumed to be correlated with calcar fractures. Implant positioning (neck-shaft angle, femoral offset and osteotomy-lesser trochanter distance) was measured on postoperative pelvic radiographs of all THA with calcar fractures and 100 randomly selected uncomplicated control cases.

Results

Seventeen (2.1%) intraoperative calcar fractures were recorded. The incidence of calcar fracture differed between the first 400 THA (n = 11) and the second 400 THA (n = 6). This difference was not statistically significant (p = 0.220); however, these numbers indicate a trend toward a learning effect. No significant difference in stem positioning nor the height of the femoral neck osteotomy was measured between THA with a calcar fracture (n = 17) and the control cases (n = 100).

Conclusions

We report on a high incidence of intraoperative calcar fractures with the use of a CLS stem. The risk for calcar fractures remains clinically significant even after adequate implant positioning in the hands of experienced hip surgeons. Surgeons should be aware of this implant related phenomenon and be alert on this phenomenon intraoperatively.

Keywords

Total hip arthroplasty Fissure Calcar fracture CLS Hip geometry Cementless 

Notes

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval

For this research, IRB statement was not necessary, as it involves retrospective research making use of an existing database. Patient data were processed anonymous.

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Copyright information

© Springer-Verlag France SAS, part of Springer Nature 2018

Authors and Affiliations

  • Carla Timmer
    • 1
  • Davey M. J. M. Gerhardt
    • 1
  • Enrico de Visser
    • 1
  • Marinus de Kleuver
    • 2
  • Job L. C. van Susante
    • 1
    Email author
  1. 1.Department of OrthopedicsRijnstate HospitalArnhemThe Netherlands
  2. 2.Department of OrthopedicsRadboud UniversityNijmegenThe Netherlands

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