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Latest publication 04/29/2016

Effects of Multiple Intra-articular Injections of 0-5% Bupivacaine on Normal and

PURPOSE: To determine the in vivo effects of multiple local anesthetic injections of 0.5% bupivacaine on normal and osteoarthritic articular...

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    [title] => Effects of Multiple Intra-articular Injections of 0-5% Bupivacaine on Normal and
    [paragraph] => Effects of Multiple Intra-articular Injections of 0.5% Bupivacaine on Normal and Osteoarthritic Joints in Rats
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Authors
Iwasaki K, Sudo H, Kasahara Y, Yamada K, Ohnishi T, Tsujimoto T, Iwasaki N

 Lab
Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
Journal
Arthroscopy.
Abstract
PURPOSE:

 To determine the in vivo effects of multiple local anesthetic injections of 0.5% bupivacaine on normal and osteoarthritic articular cartilage.

 METHODS:

 Rats with normal knee joints received an intra-articular injection of 0.9% saline solution or 0.5% bupivacaine in their right knees joint once a week for 5 consecutive weeks, starting 4 weeks after the beginning of the experiment. Rats were humanely killed at 8, 16, and 24 weeks. In a parallel experiment, rats underwent anterior cruciate ligament transection to induce osteoarthritic changes. These rats were subjected to the same protocol as those with normal knee joints, starting 4 weeks after the procedure. Static weight-bearing tests were performed on both hind limbs to evaluate changes in weight-bearing ability throughout the experiments. Rats were humanely killed at 8 and 16 weeks. Cell viability was assessed with confocal microscopy, using samples from the distal femur. Histologic assessment of osteoarthritis was performed using samples from the tibial plateau based on the Osteoarthritis Research Society International (OARSI) cartilage histopathology assessment system (i.e., OARSI score).

 RESULTS:

 Static weight-bearing tests showed no significant changes after intra-articular injection of saline solution or bupivacaine, and bupivacaine injection did not increase weight bearing compared with saline solution injection, regardless of whether there were osteoarthritic changes. There were also no significant differences in cell viability, cell density, or OARSI scores between the saline solution and bupivacaine groups at each time point, regardless of whether osteoarthritic changes were induced.

 CONCLUSIONS:

 This study suggested that single or intermittent intra-articular bupivacaine injections might not have deleterious effects on either osteoarthritic or normal joints.

 CLINICAL RELEVANCE:

 There is no strong evidence that intra-articular bupivacaine injection induces degenerative changes in articular cartilage. Therefore, these results may apply to normal and osteoarthritic joints.
BIOSEB Instruments Used
Static Weight Bearing Touch: Incapacitance Test (BIO-SWB-TOUCH-M)
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An easy and non pain-inducing solution for assessing the level of discomfort (incapacitance) in the injured paw of a small animal like a rat or a mouse by measuring the Postural Equilibrium “ independently of the operator". The static weight bearing instrument is ideal for your research on analagesia and nociception involving rodents: osteo arthrisis, cartilage degeneration, inflammation models, nerve injury models, and much more... Discover the SWB-Touch: now with a brand new touch-screen console!

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