Evaluation of Predictive Factors for Ruptures of Meije Duo ™ Size 1 and 2 Femoral Stems in Hip Replacement Surgery
Evaluation of Predictive Factors for Ruptures of Meije Duo ™ Size 1 and 2 Femoral Stems in Hip Replacement Surgery
A normative development concerning the mechanical resistance tests of the the femoral stems
 led to contraindicate, in September 2014, to implant Meije Duo ™ femoral stems size 1 or 2 in
 patients weighing more than 60 kg due to an assumed risk of femoral stem breakage.

 This contraindication is based on standardized mechanical tests which may have not taken into
 account the changes in patient weight that may occur after the intervention.

 To date, investigators have not been aware of any Meije Duo ™ size 1/2 brakeage in our
 patients implanted with this type of prosthesis regardless of their weights before 2014.
 However, it is possible that some of them have had a prostheses failure and consulted another
 hospital. In the absence of a clinical study on this problem, investigators decided to set up
 a health care assessment study collecting retrospective and prospective information from our
 patients.
First, patients with Meije Duo ™sizes 1 or 2, who had surgery from 2007 to 2014, will be
 preselected on medical records.

 The information notice will be sent to them by post. A period of reflection will be respected
 before contacting the patient to answer their questions concerning the research and its
 progress and obtain their oral consent to participate in the study.

 After obtaining consent, investigators will enter the retrospective data collected in the
 medical and prospective file collected during this call.

 Patients with at least one of the following criteria: weight> 60 kg and / or long neck /
 varus and / or DEVANE score ≥ 4, will be selected to have a hip X-ray which will be specially
 scheduled for the study.

 This examination will tell us about the state of the prosthesis and of the underlying bone
 (broken stem, loosening of the implant, bone fracture, dislocation, border, etc.

 It can be performed in our radiology department of the Diaconesses Croix Saint Simon hospital
 group or in another radiological center chosen by the patient if the latter cannot come to
 our hospital. In this case, a prescription for a hip X-ray will be sent to him by post to his
 current address as well as an information letter intended for the radiology office.

 The patients who will be included in the study are implanted with Meije Duo ™ 1 and 2 between
 2007 to 2014 and will all have a minimum follow-up of 4 years from the date of implantation.
 The maximum number of rupture complications is observed between the fourth and the eleventh
 year after fitting the prosthesis. All participants will therefore have a minimum of
 hindsight required for the evaluation of stem breaks. All of our patients will be contacted
 by telephone during the study period in chronological order of their previous management for
 obtaining consent, prospective data and for scheduling the hip radiography according to the
 criteria mentioned above.
Inclusion Criteria:

 An x-ray of the hip concerned will be performed on all consenting patients, having at least
 one criterion of the following three during their medical history since the implantation of
 the hip prosthesis.

 -  Weight> 60 kg

 -  DEVANE score ≥ 4

 -  Long neck / varus

 Exclusion Criteria:

 -  The patient expresses his opposition to the use of his personal data

 -  Patients (<18 years old)

 -  Patients unable or out of state to express their consent

 -  Patient unable to speak French

 -  Patient with memory impairment or cognitive impairment

 -  Patient not affiliated to a social security or equivalent health coverage