Today, prosthetic replacement for osteoarthritis of the knee is a frequent surgery. In France, nearly 100,000 knee arthroplasties are performed each year . Over the last two decades, there has been growing interest in performing single compartment knee replacement (SKR) surgery in patients with isolated single compartment osteoarthritis. The explanation lies in faster recovery, less postoperative pain and less morbidity compared to total knee arthroplasty (TKR) . Pain control is one of the major elements of outpatient management of CKD . Prosthetic knee surgery is very painful, the median pain is rated at 5 out of 10 and on average we use 32 milligrams of morphine . The efficiency of the adductor canal block is effective in this context, it avoids the motor block obtained by the femoral block, therefore interesting for ambulatory management in view of a resumption of the fast walking foreseen for the patient. The IPACK (interspace between popliteal artery and the capsule posterior knee) is designed to block the small sensory branches of the sciatic nerve that pass through this space without affecting the motor components. The IPACK block provides analgesia only for the posterior knee and would probably be ineffective alone for postoperative analgesia It is therefore often performed with an adductor canal block for multimodal analgesia. This block is performed in several facilities, and data are increasingly emerging on its effectiveness .

Thus, based on the recommendations of the French Society of Anesthesia and Resuscitation, on improved rehabilitation after heavy orthopedic surgery on the lower limb published in 2019 the objective of this study is to evaluate the relevance of a protocol concerning prosthetic knee replacement (PUC) in ambulatory care, based on optimized pain control.

In France, nearly 100,000 knee arthroplasties are performed each year . Knee prostheses generate a functional benefit demonstrated in the literature and limited perioperative morbidity and mortality. Over the past two decades, there has been growing interest in the use of single-compartment knee arthroplasty (SKR) in patients with isolated single-compartment osteoarthritis (OA). The explanation lies in faster recovery, less postoperative pain and less morbidity compared to total knee arthroplasty (TKR) Improvements in perioperative care with regard to analgesia, anesthesia, but also nursing care and rehabilitation have led to a significant reduction in length of stay. Effective pain management is essential and is a necessary condition for early mobilization and a reduction in length of stay. Cross et al. and Berger et al. have shown that reducing the length of stay of patients hospitalized after knee arthroplasty can be achieved not only without compromising patient safety, but also without compromising patient satisfaction .

Anticipating pain control represents a major asset for ambulatory management. As early as the end of the 1990s, it was demonstrated that pain control is the main parameter in ambulatory surgery .prosthetic knee surgery is a very painful surgery. The efficiency of the adductor canal block is effective in this context. It reduces the motor block obtained at the level of the femoral block, which is particularly interesting for ambulatory management with a view to the patient's planned fast walking. The IPACK (interspace between popliteal artery and the capsule posterior knee) is designed to block the small sensory branches of the sciatic nerve that travel in this space without affecting the motor components. The IPACK block provides analgesia only for the posterior knee and would probably be ineffective alone for postoperative analgesia,so it is often performed with an adductor canal block in a multimodal analgesic pathway. Although this block is performed in several institutions, data is still emerging on its effectiveness. For example, a randomized trial in a single institution involving 86 patients undergoing GPT revealed that the combination of IPACK, adductor canal block and periarticular infiltration improved postoperative analgesia and reduced opioid consumption compared to periarticular injection alone .

Thus, based on the SFAR recommendations on improved rehabilitation after heavy orthopedic surgery on the lower limb published in 2019 , we set up a protocol for a feasibility study of prosthetic knee replacement (PUC) on an outpatient basis, based on optimized pain control.

Inclusion Criteria:

• Patients with programmed SKR,
• >18 and < 85 years of age,
• Score ASA 1-2,
• No cognitive impairment,
• No thromboembolic TCDA,
• Without CI to local anesthetics, analgesics,
• Accepting outpatient care
• No opposition formulated

Exclusion Criteria:

<18 years and >85 years

• Patients under legal protection (guardianship, curatorship, ...)
• Refusal to participate
• Support for a total knee prosthesis,
• Emergency surgery or revision surgery,
• ASA3-4,
• SAOS not fitted,
• Allergy or hypersensitivity to local anesthetics,
• Outpatient discharge criteria not met.

Patients with programmed SKR

All collected data that underlie results in a publication

Data will be available beginning one year and ending five years following the publication

Data access requests will be reviewed by the internal committee of Brest UH. Requestors will be required to sign and complete a data access agreement.