Peri-tendinous injection of local anaesthetic,
both alone and in combination with corticosteroids, is commonly performed
in the treatment of tendinopathies. Previous studies have shown
that local anaesthetics and corticosteroids are chondrotoxic, but
their effect on tenocytes remains unknown. We compared the effects
of lidocaine and ropivacaine, alone or combined with dexamethasone,
on the viability of cultured bovine tenocytes. Tenocytes were exposed
to ten different conditions: 1) normal saline; 2) 1% lidocaine;
3) 2% lidocaine; 4) 0.2% ropivacaine; 5) 0.5% ropivacaine; 6) dexamethasone
(dex); 7) 1% lidocaine+dex; 8) 2% lidocaine+dex; 9) 0.2% ropivacaine+dex;
and 10) 0.5% ropivacaine+dex, for 30 minutes. After a 24-hour recovery
period, the viability of the tenocytes was quantified using the
CellTiter-Glo viability assay and fluorescence-activated cell sorting
(FACS) for live/dead cell counts. A 30-minute exposure to lidocaine
alone was significantly toxic to the tenocytes in a dose-dependent
manner, but a 30-minute exposure to ropivacaine or dexamethasone
alone was not significantly toxic. Dexamethasone potentiated ropivacaine tenocyte toxicity at higher
doses of ropivacaine, but did not potentiate lidocaine tenocyte
toxicity. As seen in other cell types, lidocaine has a dose-dependent
toxicity to tenocytes but ropivacaine is not significantly toxic.
Although dexamethasone alone is not toxic, its combination with
0.5% ropivacaine significantly increased its toxicity to tenocytes.
These findings might be relevant to clinical practice and warrant
further investigation.
Triamcinolone acetonide (TA) is widely used for the treatment of rotator cuff injury because of its anti-inflammatory properties. However, TA can also produce deleterious effects such as tendon degeneration or rupture. These harmful effects could be prevented by the addition of platelet-rich plasma (PRP), however, the anti-inflammatory and anti-degenerative effects of the combined use of TA and PRP have not yet been made clear. The objective of this study was to determine how the combination of TA and PRP might influence the inflammation and degeneration of the rotator cuff by examining rotator cuff-derived cells induced by interleukin (IL)-1ß. Rotator cuff-derived cells were seeded under inflammatory stimulation conditions (with serum-free medium with 1 ng/ml IL-1ß for three hours), and then cultured in different media: serum-free (control group), serum-free + TA (0.1mg/ml) (TA group), serum-free + 10% PRP (PRP group), and serum-free + TA (0.1mg/ml) + 10% PRP (TA+PRP group). Cell morphology, cell viability, and expression of inflammatory and degenerative mediators were assessed.Objectives
Methods
Intra-articular punctures and injections are performed routinely on patients with injuries to and chronic diseases of joints, to release an effusion or haemarthrosis, or to inject drugs. The purpose of this study was to investigate the accuracy of placement of the needle during this procedure. A total of 76 cadaver acromioclavicular joints were injected with a solution containing methyl blue and subsequently dissected to distinguish intra- from peri-articular injection. In order to assess the importance of experience in achieving accurate placement, half of the injections were performed by an inexperienced resident and half by a skilled specialist. The specialist injected a further 20 cadaver acromioclavicular joints with the aid of an image intensifier. The overall frequency of peri-articular injection was much higher than expected at 43% (33 of 76) overall, with 42% (16 of 38) by the specialist and 45% (17 of 38) by the resident. The specialist entered the joint in all 20 cases when using the image intensifier. Correct positioning of the needle in the joint should be facilitated by fluoroscopy, thereby guaranteeing an intra-articular injection.
