Timing of periarticular injection has no effect on postoperative pain and functional recovery in simultaneous bilateral total knee arthroplasty: a prospective randomized, double-blinded trial - Laoruengthana, A; Jarusriwanna, A; Rattanaprichavej, P; Rasamimongkol, S; Varakornpipat, P; Pongpirul, K (BMC Musculoskelet Disord, 2019)