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  • Modified Cocktail for...

Modified Cocktail for Periarticular Local Infiltration Analgesia in Total Knee Arthroplasty substantially improves pain control: study

Dr Supreeth  D RWritten by Dr Supreeth D R Published On 2025-02-21T20:30:26+05:30  |  Updated On 22 Feb 2025 11:28 AM IST
Modified Cocktail for Periarticular Local Infiltration Analgesia in Total Knee Arthroplasty substantially improves pain control: study
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Periarticular local infiltration analgesia (LIA) is largely utilized for controlling pain after total knee arthroplasty (TKA). Qiuru Wang et al conducted a study to assess the efficacy of a modified LIA cocktail for patients undergoing TKA. Investigation performed at West China Hospital, Sichuan University, Chengdu, People’s Republic of China.

Magnesium sulfate (MgSO4) and sodium bicarbonate (NaHCO3) were added to a conventional LIA cocktail comprising ropivacaine, epinephrine, and dexamethasone. After the safety of this modified cocktail was tested in rats, its efficacy and safety were evaluated in a prospective, double-blinded study including 100 individuals randomized to receive periarticular infiltration of the modified cocktail or a conventional cocktail. The primary outcome was postsurgical use of morphine hydrochloride for rescue analgesia. Secondary outcomes were the time until the first rescue analgesia, postsurgical pain (on a visual analog scale [VAS]), functional recovery (assessed by range of knee motion and ambulation distance), time to discharge, and complication rates.

Key findings of the study were:

• Adding NaHCO3 to the local anesthetics caused some instantaneous precipitation in all cases.

• Administering the modified cocktail to rats did not obviously damage the injected area of the nerve or surrounding tissues.

• Administration of the modified cocktail to patients was associated with markedly reduced postsurgical morphine use in the initial 24 hours (4.2 ± 5.0 versus 14.6 ± 8.9 mg, p < 0.001),

reduced total morphine use (9.8 ± 8.4 versus 19.6 ± 11.4 mg, p < 0.001), prolonged time to the first rescue analgesia,

lower VAS pain scores at rest and during motion at 12 and 24 hours following the operation,

better functional recovery on postoperative days 1 and 2, and

a shorter hospital stay.

• The modified and conventional cocktail groups had similar rates of complications.

“Addition of MgSO4 and NaHCO3 to a conventional LIA cocktail significantly prolonged analgesia, reduced opioid consumption, and accelerated functional recovery after TKA. It may also be possible to apply this modified cocktail to total hip arthroplasty, and even to other orthopaedic surgical procedures” the authors opined.

Level of Evidence: Therapeutic Level I.

Further reading:

Efficacy of a Modified Cocktail for Periarticular Local Infiltration Analgesia in Total Knee Arthroplasty. A Prospective, Double-Blinded, Randomized Controlled Trial Qiuru Wang et al J Bone Joint Surg Am. 2023;105:354-62 http://dx.doi.org/10.2106/JBJS.22.00614

Modified CocktailPeriarticular Local InfiltrationTotal Knee ArthroplastyQiuru Wang et alJ Bone Joint Surg Am
Source : J Bone Joint Surg Am
Dr Supreeth  D R
Dr Supreeth D R

    MBBS, Dip. Ortho, DNB ortho, MNAMS

    Dr Supreeth D R (MBBS, Dip. Ortho, DNB ortho, MNAMS) is a practicing orthopedician with interest in medical research and publishing articles. He completed MBBS from mysore medical college, dip ortho from Trivandrum medical college and sec. DNB from Manipal Hospital, Bengaluru. He has expirence of 7years in the field of orthopedics. He has presented scientific papers & posters in various state, national and international conferences. His interest in writing articles lead the way to join medical dialogues. He can be contacted at editorial@medicaldialogues.in.

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