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The ceramic-ceramic friction pair is widely used today in total hip arthroplasty, including fourth-generation ceramics which show the lowest wear rate. These have considerably reduced the risk of head fracture compared to previous generations; however, the risk of insert rupture persists with rates similar to those of third generation ceramics.
These ceramic fractures require complex revision surgery, which brings complications, exposing patients to the risk of third-body wear and tear related to persistent post-surgical debris. They are frequently due to an incorrect assembly of the ceramic causing intraoperative or early postoperative rupture. To fix this, manufacturers have developed pre-assembled cups in the factory. The Dynacup One C cup developed by Corin® corresponds to the pre-assembled version of the Dynacup cup, making it possible to eliminate the risk of anomaly during intraoperative assembly linked to the human factor and to offer patients with very small cups an adapted ceramic implant. A single study with a small sample compared the two implants (pre-assembled version [vs] modular version) clinically, radiologically and functionally without showing any significant difference. The lack of data in the literature comparing these two implants motivated us to conduct a randomized comparative study on a large sample of patients.
Patients eligible for a total hip arthroplasty with a ceramic-ceramic friction couple and scheduled for surgery will be included in this study after information and collection of written consent.
After randomization, a preoperative radiograph with a calibration ball will be taken to plan the prosthesis and identify the characteristics of the operated hip.
An x-ray of the pelvis with a 28 mm ball will be carried out the day after the intervention according to the same preoperative procedures in order to measure the postoperative radiographic parameters.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Standard Dynacup | Other | Hip arthroplasty with a standard Dynacup cup |
|
| Dynacup One C | Other | Hip arthroplasty with a cup Dynacup One C |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Randomisation Standard Dynacup or Dynacup One C | Other | Randomisation |
|
| Measure | Description | Time Frame |
|---|---|---|
| To Compare the positioning accuracy of the Dynacup One C (pre-assembled version) with that of the standard Dynacup. | Radiographic measurement of the position of the center of rotation of the final implant, its inclination and its anteversion, compared to the positioning planned before the intervention for the 2 types of implants. | Perioperative |
| Measure | Description | Time Frame |
|---|---|---|
| To describe the rate of intraoperative secondary re-impactions of both groups | Note the attempts at re-impactions for sensation of extrusion: after palpation with forceps of the bottom of the acetabulum (bone space - metal back for the standard Dynacups) or of its protruding periphery of the bone (for the pre-assembled versions) . â—‹ Note the operator's feeling before postoperative control X-ray on the good impaction of the acetabulum: at the bottom, doubtful or extrus. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Simon MARMOR, MD | Groupe Hospitalier Diaconesses Croix Saint-Simon | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Groupe Hospitalier Dianconesses croix saint Simon | Paris | ÃŽle-de-France Region | 75020 | France |
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| ID | Term |
|---|---|
| D007592 | Joint Diseases |
| ID | Term |
|---|---|
| D009140 | Musculoskeletal Diseases |
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| Perioperative |
| To describe the rate of intraoperative complications according to the type of implant | Describe the rate of intraoperative complications according to the type of implant:
| Perioperative |
| To describe the rate of insufficient impaction of the acetabulum in both groups | Describe the rate of insufficient impaction of the acetabulum in the 2 versions
| Perioperative |
| Indentify predictors for insufficient impaction of the acetabular implant | Look for predictive factors of insufficient impaction of the acetabular implant
| Perioperative |