Comparison of cobalt chromium, ceramic and pyrocarbon hemiprosthesis in a rabbit model: Ceramic leads to more cartilage damage than cobalt chromium.

Cartilage wear after hemiarthroplasty remains a problem in orthopedic surgery. The main cause of cartilage wear, apart from incongruency of the joint partners, is generally considered to be the tribology of the material surfaces. This study evaluates in 27 rabbits the degree of cartilage wear of the tibia plateau after hemiarthroplasty with proximal interphalangeal prostheses made of three different materials [cobalt chromium (CoCr), pyrocarbon (PyCa), and ceramic (Cer)].

Amount of ulnar resection is a predictive factor for ulnar instability problems after the Sauvé-Kapandji procedure: a retrospective study of 44 patients followed for 1-13 years.

Background: The Sauvé-Kapandji procedure can result in instability of the proximal ulnar stump.

Patients And Methods: We reviewed 44 patients (mean follow-up time 6 (0.6-13) years) to investigate predictive factors for ulnar instability after Sauvé-Kapandji operation.

Osseointegration and mechanical stability of pyrocarbon and titanium hand implants in a load-bearing in vivo model for small joint arthroplasty.

Purpose: To test the mechanical stability and histologic osseointegration under load-bearing conditions of 2 different materials, pyrocarbon (Py) and titanium (Ti), in a rabbit model.

Methods: Proximal interphalangeal implants (9 Ti, 8 Py) were placed into rabbit knees and the animals were killed after 3 months. Subsidence was assessed by monthly x-rays.

Occurrence of carpal osteoarthritis after treatment of scaphoid nonunion with bone graft and herbert screw: a long-term follow-up study.

Purpose: To determine the occurrence, progression, and clinical results of osteoarthritis (OA) after bone grafting and Herbert screw fixation for scaphoid nonunion.

Methods: Fifty patients were reviewed (mean follow-up period, 12.0 +/- 1.

Vascularized os pisiform for reinforcement of the lunate in Kienböck's Disease: an average of 12 years of follow-up study.

Purpose: Little is known about the long-term results of vascularized bone transplantation for Kienböck's disease. This retrospective study investigated the long-term results of vascularized pisiform transfer.

Methods: We reviewed 23 patients to analyze results after vascularized pisiform transposition to a cored-out lunate for Lichtman stages II and III.

Lunate resection and vascularized Os pisiform transfer in Kienböck's Disease: an average of 10 years of follow-up study after Saffar's procedure.

Purpose: To investigate the long-term results of lunate replacement by vascularized bone transfer in advanced Kienböck's disease.

Methods: Twenty-one patients were reviewed (mean follow-up period +/- SD, 9.9 +/- 3.

Osteosarcoma of the hand and forearm: experience of the Cooperative Osteosarcoma Study Group.

Background: Osteosarcoma is extremely rare in the hand and forearm. Therefore, only limited data are available for planning treatment or predicting the outcome and prognosis of osteosarcoma in the peripheral upper extremity.

Methods: Epidemiological, clinical, and histopathologic data were analyzed in 39 patients with osteosarcoma of the forearm or hand who were enrolled in studies of the Cooperative German-Austrian-Swiss Osteosarcoma Study Group from 1977 to December 2000.

Ewing's sarcoma and primitive neuroectodermal tumor of hand and forearm. Experience of the Cooperative Ewing's Sarcoma Study Group.

Purpose: Because Ewing's sarcoma (EWS) is extremely rare in the hand and forearm, only limited data are available for planning treatment or predicting prognosis.

Methods: Data of 33 patients with EWS of the forearm or hand who were enrolled in studies of the German Association for Paediatric Oncology/Haematology and the European Intergroup Cooperative Ewing's Sarcoma Study Group were analyzed. Patients received neoadjuvant multi-agent chemotherapy according to the valid protocol.