Hand
Mehrnoush Nakhaei; Nafiseh Jirofti; Ali Moradi; Mohammad Hosein Ebrahimzadeh
Abstract
Background: Pulley is a synovial tissue that attaches the flexor tendons to the dorsal portions of the fibro-osseous tunnel near the tendon attachment. Pulley type A with ring structure is one of the most important pulleys in fingers. Two-stage reconstruction by silicon is the common treatment in damaged ...
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Background: Pulley is a synovial tissue that attaches the flexor tendons to the dorsal portions of the fibro-osseous tunnel near the tendon attachment. Pulley type A with ring structure is one of the most important pulleys in fingers. Two-stage reconstruction by silicon is the common treatment in damaged tendon which has long recovery time and the tendency of the repaired tendon to adhere to the fibrous-bone tunnel around it. Accordingly, the one-stage reconstruction by synthetic pulley is a promising approach to resolve the mentioned problems.
Methods: In the present research, the polyurethane (PU) nanofiber scaffolds have been designed for synthetic pulley applications, and their mechanical and structural properties have been evaluated.
Results: The structural properties of nanofiber scaffolds show similar properties to protein and polysaccharide fibers in the extracellular matrix (ECM). The Fourier transform infrared spectroscopy (FTIR) results confirmed the functional groups of PU without any unwanted reactions. The amount of stress (3.19 ± 0.54) and Young's modulus (1.20 ± 0.39) in PU nanofiber scaffolds show similar mechanical properties to natural pulley.
Conclusion: The obtained results showed that the PU nanofibers scaffolds can be proposed as a suitable candidate for fabrication of synthetic pulley in flexor tendon injuries.
Behzad Aminzadeh; Motahare Ebrahimnezhad; Mohammad H Ebrahimzadeh; Hasan Mehrad Majd; Ali Moradi
Abstract
Background: This study aimed to evaluate the relationship between changes observed in an ultrasonography before and after the surgical release of carpal tunnel syndrome (CTS).Methods: This prospective study was performed on 15 candidates of CTS surgery during 2017-2018 who underwent an ultrasonography ...
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Background: This study aimed to evaluate the relationship between changes observed in an ultrasonography before and after the surgical release of carpal tunnel syndrome (CTS).Methods: This prospective study was performed on 15 candidates of CTS surgery during 2017-2018 who underwent an ultrasonography before and three months after the surgery. The structural changes in the median nerve and their correlation with the carpal tunnel were analized.Results: According to ultrasonography results, the findings related to height, diameter and cross-sectional area of the median nerve decreased in the pisiform region of carpal tunnel while they increased in the area of hamate hook (P=0.002 in pisiform and P=0.001 in hamate hook), which might be due to the elimination of nerve dysfunction in the pisiform and effective decrease of pressure on nerve in hamate hook.Conclusion: In terms of evaluation of changes in the area of the median nerve, ultrasonography of the median nerve could be an effective and accurate technique to recognize the compression and follow up the nerve status in patients with CTS after surgery.