title: Reply to dr Kumar.
authors.affiliation: Department of Anesthesiology Tokyo Women's Medical University Tokyo, Japan Department of Anesthesiology Kitano Hospital Osaka, Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Sato
authors.forename: Takehiko
authors.initials: T
authors.lastname: Adachi
mesh_terms: D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D008297:Male; D009407:Nerve Block / Q000379:methods*; D010149:Postoperative Pain / Q000628:therapy*