We reviewed 127 cases (128 clavicles) who underwent various surgicl procedures for treatment of clavicular fractures between 1988 and 1993.105 cases were treated with plate fixation. Delayed union was seen in 4 cases and nonunion occurred in 6 cases.The rate of nonunion in cases with clavicular fracture treated surgically was 4.7%.All cases of nonunion improved with plate fixation and bone-grafting.
InGaN quantum dots (QDs) are promising candidates for GaN-based all-visible optoelectronic devices such as micro light-emitting diode and laser. In this study, self-assembled InGaN/GaN multi-quantum dots (MQDs) have been grown by plasma-assisted molecular beam epitaxy on c-plane GaN-on-sapphire template. A high density of over 3.8 × 1010 cm−2 is achieved and InGaN QDs exhibit a relatively uniform size distribution and good dispersity. Strong localization effect in as-grown InGaN QDs has been evidenced by temperature-dependent photoluminescence (PL). The variation of peak energy is as small as 35 meV with increasing temperature from 10 K to 300 K, implying excellent temperature stability of emission wavelength for InGaN MQDs. Moreover, the radiative and nonradiative recombination times were calculated by time-resolved PL (TRPL) measurements, and the temperature dependence of PL decay times reveal that radiative recombination dominates the recombination process due to the low dislocation density of QDs structure.
Limb saving by prosthesis is a standard method of surgery for treatment of malignant bone tumors. We have had experience of 12 cases with a follow-up 12-72 months.The functional results according to the MSTS evaluation system were good in 6 cases and fair in 6. In each parameter, muscle strength was evaluated as poor in almost all patients with proximal Pemoral and tibial lesions. These results sugges that inprouenent is heeded in the reconstruction and attachment of hip abductors and patellar ligament.
Self-assembled growth of blue-green-yellow-red InGaN quantum dots (QDs) on GaN templates using plasma-assisted molecular beam epitaxy were investigated. We concluded that growth conditions, including small N2 flow and high growth temperature are beneficial to the formation of InGaN QDs and improve the crystal quality. The lower In/Ga flux ratio and lower growth temperature are favorable for the formation of QDs of long emission wavelength. Moreover, the nitrogen modulation epitaxy method can extend the wavelength of QDs from green to red. As a result, visible light emissions from 460 nm to 622 nm have been achieved. Furthermore, a 505 nm green light-emitting diode (LED) based on InGaN/GaN MQDs was prepared. The LED has a low external quantum efficiency of 0.14% and shows an efficiency droop with increasing injection current. However, electroluminescence spectra exhibited a strong wavelength stability, with a negligible shift of less than 1.0 nm as injection current density increased from 8 A/cm2 to 160 A/cm2, owing to the screening of polarization-related electric field in QDs.
We report on three cases of tuberculous tenosynovitis of the wrist. All cases were treated surgically, and histological findings confirmed the diagnosis of tuberculous tenosynovitis. Postoperative chemotherapy was successful and there were no recurrences.It is necessary to consider tuberculous tenosynovitis in the differential diagnosis of soft tissue tumorous lesions of the wrist.
Key Clinical Message Primary hyperparathyroidism ( PHPT ) and postoperative hungry bone syndrome are very rare conditions in adolescents, and may be frequently misdiagnosed as a metastatic bone tumor. However, delay in diagnosis may lead to a fatal preoperative hypercalcemia and postoperative hypocalcemia. PHPT is a differential diagnosis of adolescent hypercalcemia and osteolytic fractures.
Fourteen cases of traumatic dislocation of the hip were followed-up for a period ranging from 1 month to 4 years and 9 months (mean, 1 years and 10 months). Fourteen were treated by closed reduction; 6 by closed reduction followed by open reduction. Satisfactory results were obtained in 74.5% of all patients. Osteoarthritis was seen in 1 case.
In a series of 35 tibio-intramedullary fixations with interlocking nails, 83% of fractures were communited and 36% of patients had multiple injuries. Nonweight-bearing was imposed from two to four weeks. Bone healing was achieved before 12 months.The locked intramedullary nailing method is suitable for treating various types of tibial shaft fractures.
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