contained ropivacaine, morphine, epinephrine, and ketoprofen without
corticosteroid, and compared its effect with that of a periarticular
injection solution which contained the same agents but with corticosteroid.
The corticosteroid solution consisted of methylprednisolone 40
mg (Sol Mercort, Fuji, Toyama, Japan) (1 mL), 7.5 mg/mL ropivacaine
(Anapeine, AstraZeneca, Osaka, Japan) (40 mL), 10 mg/mL morphine
hydrochloride hydrate (Takeda, Osaka, Japan) (0.8 mL), 1.0 mg/mL
epinephrine (Bosmin, Daiichi-Sankyo, Tokyo, Japan) (0.3 mL), 50
mg of ketoprofen (Capisten, Kissei, Matsumoto, Japan) (2.5 mL),
and normal saline (15.4 mL). Just before implantation of the prosthesis,
20 mL of the mixture was injected into the posterior capsule and
the posteromedial and posterolateral structures.2 Small volumes of
the solution were injected into multiple sites with the knee in flexion.13 After implantation,
the remaining 40 mL of mixture was injected into the extensor mechanism,
synovium, anterior capsule, pes anserius, retinaculum, periosteum,
iliotibial band, and collateral ligaments.2 The procedure for periarticular injection without corticosteroid
was identical to that for periarticular injection with corticosteroid
except that the injectable solution contained an equivalent volume
of normal saline.