Preoperative percutaneous posterior femoral epi-periosteum injection for pain control after total knee arthroplasty: A simple and anatomically optimized surgical tip

Effective postoperative pain control after total knee arthroplasty (TKA) is essential for early mobilization and functional recovery. Various analgesic strategies, including local infiltration analgesia and peripheral nerve blocks, have been widely adopted; however, achieving consistent pain relief without technical complexity or risk of motor impairment remains challenging [1,2,4]. Despite these approaches, posterior knee pain remains difficult to control in a simple and reproducible manner. The interspace between the popliteal artery and capsule of the knee (IPACK) block has been introduced as a method for posterior knee pain control 3. However, it requires ultrasound guidance and technical expertise, and concerns regarding reproducibility remain. This study describes a simple preoperative percutaneous posterior femoral epi-periosteum injection technique and its early clinical outcomes.