Clinical Research Directory

Clinical Outcomes of Primary Cementless Total Hip Arthroplasty Using the Collarless Actis Stem

This study looks at how well a hip replacement using the collarless Actis stem works over five years. Total hip replacement is a common operation for people whose hip joint has been damaged by arthritis, by loss of blood supply to the hip bone, or by a broken hip. During the operation, the damaged parts of the hip are replaced with artificial parts. The Actis stem is the part that is fitted into the thigh bone. It is designed to bond directly with the bone, without the use of bone cement. The Actis stem is already used in many countries, and early results have been good. However, almost all of those results come from Western patients, and most studies used a version of the stem that has a small collar. Very little is known about how the collarless version performs in Asian patients, who tend to be younger at the time of surgery and more often have the operation because of loss of blood supply to the hip bone. People aged 18 years or older who are already scheduled for a hip replacement at this hospital may take part. Everyone who takes part has the same operation, with the same set of artificial parts. No extra tests are done for research purposes. After surgery, participants return to the clinic at 6 weeks, 3 months, and 12 months, and then once a year until 5 years have passed. These are the same visits that patients would have anyway. At each visit, the study team checks for any problems with the new hip, takes routine X-rays, and asks participants to fill in questionnaires about their hip pain, their daily activities, and their overall health. The main question the study asks is how many participants have a problem with the new hip within five years, such as the hip coming out of place, an infection, a break in the bone around the implant, or the implant becoming loose.

Modifications of the Subchondral Bone in Aseptic Osteonecrosis of the Femoral Head

In this study, the aim is to identify the modifications responsible for aseptic osteonecrosis of the femoral head and its structural evolution by the association of the micro scanner analysis and Raman spectrometry performed on the femoral heads removed during hip replacements. The study of femoral heads will allow the analysis of bone tissue at two different scales, both correlated with the biomechanical properties of the bone. Also, the association with preliminary MRI analysis will provide pathogenic explanations correlated to these modifications.

Observational Study to Evaluate Long-Term Outcome in Hip Arthroplasty

This long-term outcomes study is designed to collect safety and efficacy data on designated, commercially available, hip arthroplasty products.

Bupivacaine Liposome Plus Bupivacaine or Ropivacaine for Pericapsular Nerve Group Block in Hip Arthroplasty (PENG)

The goal of this clinical trial is to study the analgesic effect of liposomal bupivacaine plus bupivacaine for Pericapsular Nerve Group (PENG) block in postoperative pain management following hip replacement surgery. It will also assess the safety of liposomal bupivacaine for this purpose. The main questions it aims to answer are: 1. Is liposomal bupivacaine plus bupivacaine superior to ropivacaine in terms of analgesic efficacy, duration of pain relief, opioid consumption, and patient satisfaction? 2. What medical problems do participants encounter when using liposomal bupivacaine plus bupivacaine for PENG block in postoperative pain management following hip replacement surgery? Researchers will compare liposomal bupivacaine plus bupivacaine to ropivacaine (a routinely used regional anesthetic in clinical practice) to determine if liposomal bupivacaine plus bupivacaine is more effective for pain management following hip replacement surgery. Participants will: 1. Receive liposomal bupivacaine plus bupivacaine or ropivacaine as a regional anesthetic for PENG block under ultrasound guidance. 2. Undergo hip replacement surgery under spinal anesthesia. 3. Have pain relief, opioid analgesic consumption, and incidence of complications assessed at multiple time points within 72 hours after surgery.

Difference in Return to Sports Activity After Hip Arthroplasty by THR or Resurfacing

This study aims to evaluate the return to activity in younger patients under 50 years old after undergoing either total hip replacement (THR) or hip resurfacing, as performed in everyday practice. This research will be observational, meaning patients will not be randomly assigned to different treatment groups. To objectively assess participents; return to everyday, professional, and sports activities, validated questionnaires will be sent to participents in addition to routine clinical practice. The study will be prospective and comparative based on the type of prostheses used. In order to capture the current practices of surgeons performing THR in participents under 50 years old in France, the study will be conducted at multiple centers across the country. Since hip resurfacing is performed only in certain centers, approximately half of the participating centers are experienced in this technique. Participents typically resume activity between 3 and 6 months after THR. One year of post-operative follow-up allows for an accurate assessment of participents; recovery, unaffected by the surgery. Participents ; physical activity levels will be evaluated using the UCLA Activity Scale developed by surgeons to assess the activity levels of patients undergoing hip and arthroplasty.