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1.
PLoS One ; 19(2): e0298146, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38408057

RESUMO

INTRODUCTION: Hamstring strain injuries (HSI) and re-injuries are endemic in high-speed running sports. The biceps femoris long head (BFlh) is the most frequently injured muscle among the hamstrings. Structural parameters of the hamstring muscle are stated to be susceptible to strain injuries at this location. This retrospective study targeted comparing the BFlh's structural parameters between previously injured and uninjured athletes. METHODS: Nineteen male athletes with previous BFlh strain injury history and nineteen athletes without former lower extremity injury history were included in this study. Fascicle length, mid-muscle belly and distal musculotendinous (MTJ) passive stiffnesses of the biceps femoris long head (BFlh) were examined via b-mode panoramic ultrasound scanning and ultrasound-based shear-wave elastography. Parameter comparisons of both legs within and between athletes with and without injury history were performed. RESULTS: Comparison of the BFlh fascicle length between the injured leg of the injured group and the legs of the controls revealed a trend to shorter fascicle lengths in the injured leg (p = 0.067, d = -0.62). However, the mid-muscle belly passive stiffness of the BFlh was significantly higher in the injured legs (p = 0.009, d = 0.7) compared with the controls. Additionally, the distal MTJ stiffness was much higher in the previously injured legs compared with controls (p < 0.001, d = 1.6). CONCLUSIONS: Outcomes support the importance of BFlh properties related to stiffness, and fascicle length for injury susceptibility in athletes. Future prospective studies should determine whether the higher stiffness in the injured athletes is a cause or consequence of the HSI. Physical therapy and rehabilitation programmes after HSI should focus on BFlh muscle properties i.e., elasticity and fascicle length for reducing re-injury and increasing sports performance.


Assuntos
Músculos Isquiossurais , Traumatismos da Perna , Lesões dos Tecidos Moles , Humanos , Masculino , Músculos Isquiossurais/fisiologia , Estudos Retrospectivos , Estudos Prospectivos , Atletas , Músculos/lesões
2.
Arch Bone Jt Surg ; 11(10): 617-624, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37873528

RESUMO

Objectives: In order to treat a rat model of rotator cuff rupture, this work concentrated on the expression of TNMD and RUNX2, followed by rotator cuff repair and secretome-hMSCs. Methods: A total of thirty 10-weeks-old male Sprague-Dawley rats were separated into five groups randomly, RC on week 0, lesion treated with a rotator cuff repair and saline (RC + NaCl group, n = 6) for 2 and 8 weeks, and lesion treated with a rotator cuff repair and secretome-hMSCs (RC + secretome-hMSC group, n = 6) for 2 and 8 weeks. The supraspinatus and infraspinatus muscle-tendon units were obtained for histological and biomechanical investigation at 0, 2 and 8 weeks following injury. Results: The findings showed that, in comparison with the RC + NaCl group, secretome-hMSCs significantly improved tendon repair by upregulating TNMD and RUNX2 expression and histology score. Conclusion: Combining Secretome-hypoxia MSCs with RC healing may help rats with rotator cuff tears.

3.
Med Glas (Zenica) ; 20(2)2023 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-37421180

RESUMO

Aim To determine the effect of secretome hypoxia mesenchymal stem cells (SH-MSCs) on the relative gene expression of hypoxia inducible factor-1a (HIF-1a) and basic fibroblast growth factor (bFGF) in accelerating histomorphometric repair of tendon to bone interface healing in rats acute rotator cuff tear (RCT) model. Methods This is experimental research with posttest control group design. Thirty-male Wistar rats were divided into five treatment groups: healthy group and rotator cuff reconstruction group included four groups: SH-MSCs W2 (the treatment group was given a SH-MSCs 0.5 mL and terminated at weeks 2), NaCl W2 (the control vehicle group was given NaCl 0.5 mL and terminated at weeks 2), SH-MSCs W8 (the treatment group was given a SH-MSCs 0.5 mL and terminated at weeks 8), and NaCl W8 (the control vehicle group was given NaCl 0.5 mL and terminated at weeks 8). On the termination day, all the rats were terminated and HIF-1a and bFGF gene expression were analysed using qRT-PCR. Results SH-MSCs significantly increased the HIF-1a and bFGF gene expression than NaCl group even in week 2 and week 8. The highest increased gene expression of HIF-1a and bFGF was on week 8. Conclusion SH-MSCs are important in the healing repair process of tendon-to-bone interface in acute RCT model rats through increasing gene expression of HIF-1α and bFGF.

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