technetium-tc-99m-medronate and Atrophy

To study the clinical hand findings in Behçet's disease (BD) and to observe scintigraphic changes of these areas.. Fifty-seven randomly selected BD patients and the patients in the control group (N=40) were evaluated by two blind rheumatologists. The hands were examined for the presence of pain, tenderness, swelling, effusion, erythema, warmth, range of motion and limitation of motion, deformities and muscle atrophy. Then scintigraphic examination of the hands was performed. Control hand scintigrams were obtained from 40 age- and sex-matched patients and were examined by the same two observers.. Thirty-two of the 57 patients (56.1%) showed Behçet's clinical hand findings. Terminal phalangeal pulp atrophy was observed in 17 (29.81%), rheumatoid-like hand findings were observed in 16 (28.1%), dorsal interosseos atrophy was observed in 12 (20.05%) and erythema over the digits was observed in 12 (20.05%). Twenty-four patients (42.1%) had scintigraphic involvement. The disease duration was observed to be an important factor for hand findings (P=0.040) and scintigraphic involvement (P=0.011).. High prevalence of hand involvement in BD and its relationship with disease duration is demonstrated. Hand involvement tends to be overlooked and careful examination is required in the evaluation of BD. The scintigraphic involvement detected in hands requires special consideration, too.

Topics: Adolescent; Adult; Arthralgia; Atrophy; Behcet Syndrome; Edema; Erythema; Female; Finger Joint; Follow-Up Studies; Hand Deformities, Acquired; Humans; Male; Middle Aged; Observer Variation; Prevalence; Radionuclide Imaging; Radiopharmaceuticals; Severity of Illness Index; Technetium Tc 99m Medronate

The aim of the present study was to evaluate the healing of onlay grafts to edentulous jaws and after tumor ablation in conjunction with osseointegrated implants using sequential bone scintigraphy and single photon emission computed tomography (SPECT). A total of 24 patients were examined after onlay grafting of extremely atrophic edentulous jaws and after tumor ablation with secondary implant placement 21.4 weeks after grafting. Technetium-99m (MDP) scintigrams were performed immediately after grafting, before and after implant placement, and before abutment connection. Tracer accumulation was assessed semiquantitatively by calculating ratios of count densities between the uptake over the calvaria and over the grafted jaws. There was a significant decrease in tracer uptake during graft healing, which was followed by a significant increase after implant placement and a subsequent decrease during implant healing. In patients with complicated healing, tracer uptake in areas of subsequent graft infection immediately after grafting was significantly lower compared with patients with uneventful healing. These areas also showed a lower increase in tracer accumulation after implant placement due to inferior graft quality, followed by a significant increase of tracer uptake at the time of abutment connection, representing inflammatory peri-implant bone reaction. Sequential bone scintigrams and bone SPECT have the prognostic potential to detect areas of inferior graft revascularization leading to graft infection or failure in the osseointegration of implants. Only bone SPECT allows an exact localization of areas with complicated healing.

Topics: Adult; Aged; Alveolar Process; Alveolar Ridge Augmentation; Atrophy; Bone Transplantation; Dental Implantation, Endosseous; Humans; Jaw Neoplasms; Middle Aged; Mouth, Edentulous; Postoperative Complications; Prospective Studies; Technetium Tc 99m Medronate; Tomography, Emission-Computed, Single-Photon; Wound Healing

A modification of the Morey tail suspension model was used to determine atrophic responses of rat bone and muscle with 14-90 days unloading of the hindlimbs. Bone uptake of methylene diphosphonate followed a phasic pattern similar to changes in bone formation rate in immobilized dogs and rats. Increased uptake at 60 days (P = 0.01, femur) indicated an increased bone metabolism. Regional densitometry demonstrated a preferential loss of bone mineral in the trabecular mass (P = 0.02) at 30 days and in the cortical shaft by 90 days (P = 0.03). Maximal muscle atrophy occurred within 14-30 days. The gastrocnemius was less severely affected by suspension than by immobilization techniques, whereas the soleus atrophied (by weight) similarly, suggesting that muscle atrophy in the suspension model is distinctly different from immobilization atrophy. One significant response of skeletal muscle to suspension was an altered blood distribution. Muscle blood distribution changes reflect the hypodynamic state of muscle that continues to contract but probably at an altered rate in response to altered functional demands.

Topics: Animals; Atrophy; Bone and Bones; Bone Development; Densitometry; Diphosphonates; Gravitation; Immobilization; Minerals; Muscles; Muscular Atrophy; Rats; Regional Blood Flow; Technetium; Technetium Tc 99m Medronate; Time Factors; Weightlessness

One hundred and eight bone scans using 99mTechnetium methylene diphosphonate (MDP) were performed in rats undergoing vascularized and nonvascularized syngeneic and allogeneic transplants of the hind limb, and in control animals. A six-level system of grading the radionuclide uptake in the graft was used to evaluate healing or complications of the transplantation. Bone scanning was superior to other modalities in assessing viability of the graft. Bone scans were able to: (1) immediately confirm vascular patency, thus obviating angiography; (2) demonstrate differences in the rate of repair in syngeneic and allogeneic nonvascularized grafts; (3) sequentially assess vascularized allograft rejection; and (4) document long-term effects, such as bone atrophy due to disuse and early epiphyseal maturity.

Topics: Animals; Atrophy; Bone and Bones; Bone Transplantation; Diphosphonates; Epiphyses; Graft Rejection; Hindlimb; Intraoperative Period; Microsurgery; Radionuclide Imaging; Rats; Rats, Inbred F344; Technetium; Technetium Tc 99m Medronate; Transplantation, Homologous; Transplantation, Isogeneic