The Effect of Platelet-Rich Plasma on Type I Collagen Production, VEGF Expression, and Neovascularization after Femoral Bone Implants: A Study on Rat Models.

Introduction: Platelet-rich plasma (PRP) contains many growth factors, such as FGF, which induces the production of type I collagen, and VEGF, which induces neovascularization, all of which are important in bone healing. This study aimed to evaluate the effect of PRP administration on type I collagen production, VEGF expression, and neovascularization in rat models following femoral bone implants using K-wire. Methods: An experimental randomized control study was conducted on 24 white male rats (Rattus norvegicus) in the Wistar strain that underwent K-wire implantation, where PRP was administered to the treatment groups. The amount of type I collagen was measured by immunohistochemistry VEGF expression using sandwich ELISA, and neovascularization by histopathological examination. Results: The amount of type I collagen in the treatment group (50->150/field of view) was significantly higher than the control group (0-99/field of view; p=0.003). VEGF expression in the treatment groups was significantly higher than controls: 10.90±4.47 and 2.29±0.92, respectively (p=0.006). Mean number of new vessels formed on fibrotic capsules in the treatment groups was significantly (p=0.007) higher than the control groups (2.69±1.03 vs 0.67±0.52). Conclusion: The use of PRP significantly increased type I collagen production, VEGF expression, and neovascularization in rat models, elucidating the potential of PRP to be used in clinical settings to enhance the bone-healing process.

One-stage Reconstruction of Penile Paraffinoma Using Spiral Stitches FTSG and Evaluation of Sexual Function.

Paraffinoma of the penis is rare and caused by paraffin liquid injection. This condition can cause significant penile deformity, ulceration, pain, and sexual dysfunction. However, it can be managed with surgical procedures to obtain normal aesthetic and functional results. Herein, we reported a 42-year-old male with penile paraffinoma who underwent excessive surgical excision of the fibrotic tissue and one-stage reconstruction using a spiral stitch full-thickness skin graft. At one year of follow-up it showed a good aesthetic outcome with no hypertrophic scars, skin contractures, penile curvature, or penile shortening. The sexual evaluation using the International Index of Erectile Function instrument also showed a good result with normal erectile function and satisfaction with sexual sensation. This case is interesting because we used the spiral stitch full-thickness skin graft technique to cover the degloving area and long-term follow-up to evaluate the aesthetic and functional results.