Remodeling of bone tissue around the distal part of Zweymüller stem.

Background: The Zweymüller stem is well-known in Europe and widely used for total hip replacement since 1980. Few authors have noted the presence of increased bone density below the tip of the stem; however, the underlying mechanism is still unknown. The aim of this study was to reveal factors influencing bone remodeling around the tip of the Zweymüller stem.

Massive failure of TiNbN coating in surface engineered metal-on-metal hip arthroplasty: Retrieval analysis.

This article presents examination of a failed total hip replacement with surface engineered metal-on-metal (MoM) articulation. The implant was coated with a thin TiNbN film (Physical Vapor Deposition), and at retrieval 53 months after implantation the coating was abraded on weight-bearing part of the head and acetabular component. Scanning electron microscopy of bearing surfaces demonstrated multifocal crack formation, delamination of small film fragments, and formation of aggregates containing nanometer sized wear debris.

30-year survival of a McKee-Farrar hip prosthesis--case report and microscopic analysis of bearing surface.

We report a case of a female patient using a McKee-Farrar prosthesis for 30 years, until revision surgery for aseptic loosening. Electron microscopy analysis of bearing surface of the retrieved implant was performed, and the results were presented in comparison with previously published papers.

Debonding of porous coating of a threaded acetabular component: retrieval analysis.

This report presents a case of debonding of plasma sprayed porous titanium coating from a threaded acetabular component which caused aseptic loosening of the implant. Weight bearing after delamination caused abrasive damage of the acetabular shell, and particles of the coating embedded in the acetabular liner. Microscopic examination of periprosthetic tissues showed presence of metal particles and macrophage infiltration.

[Assessment of the level of metal ions in the blood of patients after hip resurfacing--preliminary report].

Introduction: Metal-on-metal bearings characterize lower wear than metal-poly, lower fracture risk than ceramics and they allow for the manufacturing of large diameter heads. The metal ion release from the bearings is the the major concern of these articulations.

Material: The study group consisted of 16 patients who underwent hip resurfacing with Durom implant and had minimum 1 year follow-up period.

[Early results of revision hip arthroplasty using modular Restoration stem].

Unlabelled: There is an increasing number of hip joint arthroplasty procedures all over the world which are followed by revision surgery. The cases of severe bone loss and periprosthetic fractures revision of a stem can constitue a serious challenge even for an experienced orthopedic surgeon.

Material: In the research material there are 18 patients 6-50 months after the stem of the hip prosthesis revision with Stryker Restoration modular stem.

[Porous tantalum modular cups in revision hip arthroplasty].

Introduction: Modem indications for use of cemented or uncemented implants in revision hip arthroplasty are comparable. The use of bone cement provides predictable short term results, but the lack of osteointegration deteriorates its long term durability. Uncemented implants undergo osteointegration, but reduced contact with host bone may cause early loosening.

[Reactions of bone tissue around the ABG II stem].

Unlabelled: The uncemented total hip replacement became a standard in treatment of the severe hip osteoarthritis. Its long term efficiency is based on the correct osteointegration which depends on the adequate implantation. Material.

[Total knee replacement in joints with severe varus and bone deficiency].

Introduction: Total knee replacement in knees with severe valgus and defects of the medial tibial condyle are at higher risk complications than in knees with a correct axial allignement.

Material And Methods: The study group included 10 patients (11 knees) with with severe valgus and defects of the medial tibial condyle in which TKR was performed. In 8 cases bone defects were filled with bone autograft in 3 cases defects were filled with metal augments.

[Current views on the pathogenesis of osteoarthritis].

Degenerative joint disease is the most common joint pathology and the main cause of disability of elderly people in developed countries. It is caused by imbalance between degeneration and regeneration of articular cartilage accompanied by pathological changes of other joint structures. No generally recognizable description of the pathogenetic pathway of osteoarthritis (OA) exists so far, however recent studies have widened the knowledge of the underlying pathology.

Total hip arthroplasty following Ganz periacetabular osteotomy. Cases study.

The Ganz periacetabular osteotomy (PAO) is currently the most popular hip-sparing procedure in adults with acetabular dysplasia. If this procedure fails and a total hip arthroplasty is necessary, spatial reorientation of the acetabulum alters the conditions of implanting the acetabular component of the prosthesis. In our study, we present two cases of total hip arthroplasty in patients who had undergone PAO.

[Operative treatment of femoro-acetabular impingement in hip joint].

For many years early treatment of degenerative joint disease in hip joint included only conservative procedures or extraarticular surgery eg. pertrochanteric osteotomy, acetabular roof reconstruction. Discovery of femoro-acetabular impingement mechanism opened space for new advanced operative techniques.

[Physical activity and quality of life following total uncemented hip replacement and hip resurfacing].

Introduction: The influence of physical activity on the survival of total hip replacement remains not fully recognized. It is unclear which activities are beneficient for patients following THR.

Material: The study was conducted on group of 87 patients (94 hips) following uncemented THR with ABGII/Trident and 45 patients (51 hips) following hip resurfacing.

[Pedobarographic evaluation of the foot after Keller's procedure for Hallux valgus and Hallux rigidus].

Hallux valgus and hallux rigidus are common foot deformities. One of possible procedures is Keller's surgery. The purpose of this study is to evaluate the use of pedobarography for postoperative evaluation of the foot.

Early acute phase response following total hip replacement.

Background: The acute phase proteins are commonly known universal markers of the inflammatory process. The aim of the study was the evaluation of the acute phase response in the first 6 months THR. The secondary aim was to check if the type of hip replacement affects the acute phase response.

[Acute phase response following total hip replacement and in patients with aseptic loosening].

Introduction: Aseptic loosening is a result of the chronic inflammatory reaction in periprosthetic tissues. Its intensity depends on the implants construction material and reactivity of the host's tissues. The aim of the study was the evaluation of the acute phase proteins in various periods following total hip replacement and comparison between acute phase response observed in patients with well-functioning implants and with aseptic loosening.

[Quality of life in patients before and after total hip arthroplasty].

Introduction: Osteoarthritis is the most common joint disease in adults and according to WHO is one of the civilisation threats. Total joint replacement is the best method of treatment of severe osteoarthritis.

Material And Methods: The study group consisted of 62 (44 women, 18 men) patients, who due to the severe osteoarthritis underwent total hip replacement at the Department of Orthopaedics Poznań University of Medicine.

Development and remodeling of the hip joint of preterm neonates in sonographic evaluation.

Background. Recent studies on the developmental dysplasia of the hip emphasize the role of the last trimester of pregnancy in the origin of the pathology. The aim of the study was to evaluate the development of the hip joints of preterm neonates born with different weight and in different periods of pregnancy.

A proposal for the radiological evaluation of treatment outcome in developmental dislocation of the hip and the classification of results.

The present study describes and analyzes current methods of evaluation of the morphology of the dysplastic hip found in the literature. The authors own method of evaluation is presented, which is based only on measurable parameters, and provides an objective and comparable definition of all the elements of which the joint is composed. The classification presented here enables the complete description of the morphology of the hip joint: the acetabulum, the proximal femur, the congruity of the joint, and the shape of the femoral head.

Evaluation of the operative treatment of the developmental hip dislocation performed second year of life.

Background. Both conservative and surgical treatment are applied in the treatment of developmental hip dislocation in the second year of life. Our study to evaluated the results of surgical treatment at this age using open reduction combined with transiliac osteotomy and translation of the distal insertion of the iliopsoas muscle.

The prognostic importance of congruity of the hip joint in the reduction of residual dysplasia after successful conservative treatment of developmental luxation.

Background. Conservative treatment of developmental hip dislocation aims for stable reposition. However, after treatment a significant number of joints are not completely remodeled.

The history of treatment for scoliosis in the Wielkopolska and Lubuska regions.

This article presents the history of treatment for scoliosis in the Wielkopolska and Lubuska regions of Poland between 1840 and 2003. Surgical treatment for scoliosis was initiated by I. Wierzejewski, who worked in the first orthopedic Hospital in Poznań between 1913 and 1930.

[Osteoarthritis secondary to the developmental hip dysplasia-treatment options in young patients].

The choice of the treatment method in young patients with osteoarthritis secondary to the developmental hip dyplasia is one of the most difficult dilemmas in orthopaedic practice. Currently total cementless hip replacement with metal-on-metal articulation is a routine procedure. Young patients are particularly exposed to the risk of aseptic loosening due to their high activity and long duration of life with implant.

[The hip joints of preterm neonates in sonographic evaluation].

The introduction of sonography to the evalution of the hip joint, allowed for the non-invasive examination in preterm neonates and thus assessment of the development their hip joints. MATERIAL AND METHODS. The examined group consisted of 143 preterm neonates with the body weight by delivery lower then 2000 grams (286 hip joints) and the control group of 31 children from term delveries forming the control group.

Neutrophils are active in total joint implant loosening.

Background: Polymorphonuclear neutrophils (PMN) are the first cells to take part in the local foreign body reaction in aseptic loosening of endoprostheses. The aim of this study was to evaluate the systemic host reaction to total joint replacement by measuring the production of nitric oxide by neutrophils before and after total joint replacement.

Patients And Method: Blood samples were collected from 33 patients (27 hips and 6 knees) before surgery, and 2 weeks, 2 months and 2.