Background The pulley system plays an important role in flexion mechanism. Reconstruction after trauma can be challenging. Numerous techniques have been described with several drawbacks. Herein, we describe the superficialis flap oblique technique for A4 pulley reconstruction using an animal model. Methods Forty-two fresh legs of 21 eight-week-old chickens were used to evaluate the maximum flexion angle (MFA) and force at maximum flexion (FMF) in intact and sectioned A4 pulley equivalents of the third digit after reconstruction with the transverse double loop (TDL) technique and the superficialis oblique flap (SOF) technique. Biomechanical measurements were obtained in an exclusively designed instrument. Descriptive statistics were reported, and mean differences between the reconstructive techniques were analyzed. Results Intact and severed A4 pulley equivalent average MFA were 96.50° ± 1.70° and 115.60° ± 1.50°, respectively. Average FMF were 8.16 ± 0.23 psi with the intact pulley and 6.92 ± 0.20 psi with the sectioned pulley (P < 0.001). After reconstruction with TDL and SOF techniques, the legs reached an average MFA at the distal interphalangeal joint of 98.13° ± 1.20° and 96.90° ± 1.30°, respectively. Mean MFA difference was 1.23° (P = 0.03). Force at maximum flexion was 8.12 psi and 8.10 psi for the TDL and SOF techniques (P = 0.6), respectively. Conclusions The authors believe that SOF technique for A4 pulley reconstruction can be used as first option when available, taking into account its theoretical advantages and its proven biomechanical characteristics. Long-term functional results should be assessed to translate these results into the clinical setting.

Cómo citar este artículo: Gómez MÁ, et al. Colgajo de perforantes de la arteria glútea superior para reconstrucción de defecto en región lumbosacra: reporte de un caso. Rev Colomb Cancerol. 2015. http://dx.

The embryonic development of Physa cubensis (Pfeiffer, 1939) mollusk is described. The collection of eggs took place in different bodies of water from the savanna of Bogotá, Colombia during 2017 and 2018 in the months of November to April. Searches were made among the leaves and stems of macrophytes, as well as sticks and stones. A total of 70 egg laying sites were identified and about 858 eggs were evaluated. Nine embryonic stages were identified: fertilized egg, cleavage of two cells, four cells, eight cells, thirtytwo cells, initial and late blastula, initial and late gastrula, Trochophore and veligers larvae. These freshwater organisms, due to their rapid embryonic development, as well as the large number of eggs deposited during each spawning, demonstrate overpopulation, and thus potential for becoming a pest.