Evaluation of the Effectiveness of an Accelerated Rehabilitation Protocol Based on Multimodal Analgesia Optimization for Uni-compartmental Knee Prosthesis Surgery: Observational, Prospective, Monocentric "Before-after"

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.