Pelvic Reconstruction after Chronic Pubic Symphysis Diastasis and Bladder Herniation

The research proposes a surgical technique for patients with chronic pubic symphysis diastasis and bladder herniation by means of a pelvic reconstruction technique. Three patients were treated initially in other hospitals and referred to us. All presented with pubic symphysis diastasis greater than 7 cm and bladder herniation. Two patients were initially treated with external fixation, and in one patient, the symphysis diastasis had been completely neglected. All cases presented good evolution with the proposed technique, which is described in details in the paper.

Uterus-reserved or hysterectomized total pelvic floor reconstruction for female pelvic dysfunction:a clinical analysis of 74 cases

Objective To evaluate the effectiveness and safety of the entire pelvic floor reconstruction(Prolift) with uterus reserved in the treatment of pelvic floor dysfunction diseases.Methods From March 2008 to January 2009,74 female cases from our hospital who had different defects in pelvic organ prolapse were treated with the entire reconstructive pelvic surgery,in which 38 had uterus retained(observation group) and 36 cases had hysterectomy(control group).The two groups were compared.The patients with combined stress urinary incontinence had transobturator tension-free vaginal tape(TVT-O technique) at the same time.The results of operations were objectively evaluatedaccording to Pelvic Organ Prolapse Quantification sub-degree method(POP-Q) developed by the International Continence Society.Results For observation group,the average operative time was 50 min,and the average amount of bleeding was 100 mL.For control group,the average operative time was 110 min,and the average amount of bleeding was 200 mL.During the postoperative follow-up(8 ~18 months),in the observation group the structures of patients' pelvic floor were normal;stress urinary incontinence was all cured;related symptoms disappeared or were markedly improved;and no postoperative infection appeared.In control group,two cases had postoperative infection;the patients ' pelvic structures were normal during the postoperative follow-up;the related symptoms disappeared or were significantly improved.After 3 months,POP-Q score was significantly elevated in the two groups.Conclusion Full reconstructive pelvic surgery with uterus retained can complete the whole pelvic floor structure and function of all or part of the reconstruction with fast recovery and clear short-term effect.However,the long-term efficacy remains to be revealed.

Transvaginal mesh implant for pelvic organ prolapse:Huaxi protocol

With increasing age,pelvic organ prolapse(POP),due to its high incidence,has become a common disease that seriously affects patients’quality of life and places a heavy economic burden on families and society.Transvaginal mesh(TVM)is a minimally invasive and effective treatment for POP,although its use remains controversial due to the potential risk of mesh-related complications.The US Foods and Drugs Administration,along with authorities in England,Australia,New Zealand,and other countries,have banned the sale and distribution of commercial TVM kits designed for POP.The TVM procedure remains an option for POP treatment and still appeals to many surgeons and patients today in Asia and most European countries,which suggests that a considerable number of POP patients can benefit from its continued refinement.Here we introduce the Huaxi protocol of the TVM plant for the treatment of POP.

Design,characterisation,and clinical evaluation of a novel porous Ti-6Al-4V hemipelvic prosthesis based on Voronoi diagram

Three-dimensional printed Ti-6Al-4V hemipelvic prosthesis has become a current popular method for pelvic defect reconstruction.This paper presents a novel biomimetic hemipelvic prosthesis design that utilises patient-specific anatomical data in conjunction with the Voronoi diagram algorithm.Unlike traditional design methods that rely on fixed,homogeneous unit cell,the Voronoi diagram enables to create imitation of trabecular structure(ITS).The proposed approach was conducted for six patients.The entire contour of the customised prosthesis matched well with the residual bone.The porosity and pore size of the ITS were evaluated.The distribution of the pore size ranged from 500 to 1400μm.Porosity calculations indicated the average porosity was 63.13±0.30%.Cubic ITS samples were fabricated for micrograph and mechanical analysis.Scanning electron microscopy images of the ITS samples exhibited rough surface morphology without obvious defects.The Young’s modulus and compressive strength were 1.68±0.05 GPa and 174±8 MPa,respectively.Post-operative X-rays confirmed proper matching of the customised prostheses with the bone defect.Tomosynthesis-Shimadzu metal artifact reduction technology images indicated close contact between the implant and host bone,alongside favourable bone density and absence of resorption or osteolysis around the implant.At the last follow-up,the average Musculoskeletal Tumour Society score was 23.2(range,21-26).By leveraging additive manufacturing and Voronoi diagram algorithm,customised implants tailored to individual patient anatomy can be fabricated,offering wide distribution of the pore size,reasonable mechanical properties,favourable osseointegration,and satisfactory function.

Extralevator abdominoperineal excision for advanced low rectal cancer:Where to go

Since its introduction,extralevator abdominoperineal excision(ELAPE)in the prone position has gained significant attention and recognition as an important surgical procedure for the treatment of advanced low rectal cancer.Most studies suggest that because of adequate resection and precise anatomy,ELAPE could decrease the rate of positive circumferential resection margins,intraoperative perforation,and may further decrease local recurrence rate and improve survival.Some studies show that extensive resection of pelvic floor tissue may increase the incidence of wound complications and urogenital dysfunction.Laparoscopic/robotic ELAPE and trans-perineal minimally invasive approach allow patients to be operated in the lithotomy position,which has advantages of excellent operative view,precise dissection and reduced postoperative complications.Pelvic floor reconstruction with biological mesh could significantly reduce wound complications and the duration of hospitalization.The proposal of individualized ELAPE could further reduce the occurrence of postoperative urogenital dysfunction and chronic perianal pain.The ELAPE procedure emphasizes precise anatomy and conforms to the principle of radical resection of tumors,which is a milestone operation for the treatment of advanced low rectal cancer.

Prospective study of reconstructing pelvic floor with GORE-TEX Dual Mesh in abdominoperineal resection

Background Mesh reconstruction has been proved to be an effective method in incisional hernia repairment. This study was designed to evaluate the effect of reconstructing the pelvic floor with the high-inlay expanded polytetrafluoroethylene （ePTFE） GORE-TEX Dual Mesh （WLGore And Associates, Flagstuff, USA） in abdominoperineal resection. Methods Sixty patients who underwent abdominopedneal resection for rectal cancer were assigned to 2 groups. The pelvic peritoneum was closed by routine sutures in group 1 and reconstructed with ePTFE in group 2. Postoperative complications and related items were evaluated and the patients were followed up. Results Time of confining to bed, bowel function recovery, fasting, and detaining drainage were significantly different between two groups （P 〈0.05）. In group 1, three patients developed bowel obstruction （10%）, while no bowel obstruction was observed in group 2. Conclusion Reconstruction of the pelvic floor using ePTFE results in quicker postoperative recovery and could decrease the risk of postoperative intestinal obstruction.

Biomechanical Study on the Novel Biomimetic Hemi-Pelvis Prosthesis

A pelvic endoprosthesis is the primary means of pelvic reconstruction after internal hemipelvectomy. In this study, a novel biomimetic hemipelvic prosthesis, including an artificial ilium, an artificial acetabulum, and an artificial pubis, was developed. A Finite Element Method （FEM） was carried out to investigate the biomechanical performance of a pelvis reconstructed with biomimetic hemipelvic prosthesis. Two models, including the reconstructed pelvis and the original pelvis （control model）, were established according to the geometry from CT data of a human male patient with pelvic bone sarcomas. The FE models predict that the biomeehanical function of the pelvic ring can be reestablished using this prosthesis. Results show that the body force loaded on the S 1 vertebra is restored and transferred towards the sacro-iliac joint, and along the ilium onto the bearing surface of the artificial ilium, then to the artificial acetabulum and pubis. Von Mises stresses observed in this reconstructed pelvis model are still within a low and elastic range below the yielding strength of cortical bone and Ti6A14V. The values of deformation and strain of the reconstructed pelvis are close to the data obtained in the original pelvis. With the partial replacement of the pubis, little influence is found towards the pubis symphysis. However, the interface between the prosthesis and pelvic bone may become the critical part of the reconstructed pelvis due to the discontinuity in the material properties, which results in stress shielding and deformation constraining. So a biomimetic flexible connection or inter layer to release the deformation of pelvis is suggested in future designing.