Although intra-articular knee injection is not a complicated procedure, it could be difficult to assess whether the tip of the needle lies free in the joint or is embedded in synovium or other intra-articular soft tissues. The purpose of this study was to evaluate the accuracy rate of intra-articular injection using anteromedial (AM), anterolateral (AL), lateral midpatellar (LMP), and medial midpatellar (MMP) portals in cadavers. In this study 156 knees of 78 fresh cadavers were included. Anterolateral and AM injection to both knees of 39 cadavers (78 knees) were performed. MMP and LMP injection to both knees of other 39 cadavers were also performed. Accuracy rate was the highest (85%) in the AL injection portal and lowest in the MMP portal (56%). In conclusion, the accuracy obtained with use of the MMP portal was significantly lower than that obtained with the use of either the AM (P < 0.05), AL (P < 0.0001), or LMP (P < 0.05) portal. Although AL injection site resulted in good intra-articular delivery with 85% accuracy rate and with a lower incidence of soft tissue infiltration, the results were not statistically significant when compared to AM and LMP portals. Therefore, any of these three portals might be preferred depending on the experience of the physician. On the other hand, 100% accuracy could not be obtained through any portals in the study, which should be kept in mind when treating knee problems with intra-articular medications.

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No significant differences could be found between the failure loads of all 3 investigated tenodeses for the first 9 weeks.

The purpose of this study was to assess the accuracy of injections of dye into the first extensor compartment of the wrist using three different techniques in 150 wrists in 75 fresh cadavers. To compare injections, 50 wrists from 25 cadavers were used for each technique. After the injections, the first extensor compartment was dissected and the dispersion of dye around the abductor pollicis longus and extensor pollicis brevis tendons was investigated. In 72 % of all the wrists, acrylic dye was dispersed into one compartment containing both the abductor pollicis longus and extensor pollicis brevis tendons, but in 28% of the wrists there was a separate compartment for extensor pollicis brevis and dye entered only one of the compartments (14% for each compartment). For accurate injections, we think the injections should be made separately over the two tendons, to allow for the possibility of a septum within the compartment.

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