Following curettage of enchondromata of the phalanges we filled the resultant bone cavity with hydroxyapatite cement in eight patients to avoid cancellous bone grafting. This material differs significantly from the ceramic hydroxyapatite commonly used in clinical practice. It is produced by the combination of two calcium phosphates which, in the presence of water, form a paste that cures to a solid implant with a microporous structure. Like ceramic hydroxyapatite, this cement is highly biocompatible and does not provoke a foreign body giant cell reaction, a sustained inflammatory response or a toxic reaction. We performed a prospective study with X-rays and clinical assessment up to 1 year after the operation. There were no complications, and all patients regained full function of the hand.
Because we found only a minimal increase of the pulmonary arterial pressure as a sign of pulmonary embolism, we conclude that by using the RSR, the systemic side effects caused by intravasation of medullary content during reaming could be reduced as far as possible.
We compared sport-specific-skills in 23 athletes with functionally unstable ankle joints to those of 18 healthy volunteers by performing a Japan test as well as a specially designed single-leg jumping test. For external stabilization of the ankle, an Aircast brace, a Ligafix Air brace, a Malleoloc brace and a tape bandage were applied. For the Japan test in the group with uninjured ankle joints, the best results were obtained when wearing the Aircast brace, followed by tape bandage, Ligafix brace and no stabilizing device in descending order. The worst results were presented by the group with the Malleoloc brace. However, there were no significant differences among these devices. In the group with functionally unstable ankle joints, the best score was achieved with the tape bandage, followed by the Ligafix brace, Mallcoloc brace and Aircast brace. The unstabilized group showed significantly worse results compared with all other groups. In the single-leg jumping test, the stabilizing devices had no negative influence on the jumping capability in the uninjured ankle joints. Additionally, there was no significant difference among the orthoses. Volunteers with unstable ankle joints experienced a significant improvement of jumping performance with most of the devices. The best results were achieved with the Aircast brace, followed by the Malleoloc brace, Ligafix brace and tape bandage. However, there was no significant difference among these orthoses. While the reaction time of the volunteers was the same for all test situations, the time for dynamically stabilizing the ankle joint appeared to be significantly worse in those ankle joints without a brace. For athletic activities, which are dominated by movement patterns comparable to the Japan test as well as the jumping test used, these stabilizing devices seem to have no negative effect on sport-specific capabilities.
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