Comparison of adductor canal block and IPACK block (interspace between the popliteal artery and the capsule of the posterior knee) with adductor canal block alone after total knee arthroplasty: a prospective control trial on pain and knee function in immediate postoperative period - Sankineani, S R; Reddy, A RC; Eachempati, K K; Jangale, A; Gurava Reddy, A V (Eur J Orthop Surg Traumatol, 2018)