[Wear and periprosthetic osteolysis of modular, hemispheric acetabular cups]. / Zuzycie i osteoliza wokól modularnych, pólkulistych panewek stawu biodrowego.

Osteolysis associated with polyethylene wear has become one of the most prevalent complications associated with uncemented modular, hemispherical cups. Sixty-five consecutive total hip arthroplasties (ABG i, Howmedica, Stryker) were followed 6-12 years. Cumulative survivorship for the cup was 55.7% after 10 years. There were 20 cups revisions because of polyethylene wear and periprosthetic osteolysis (14 cups) or cup loosening (6 cups). Stability was assessed intraoperatively, 14 cups were revised, whereas 6 new polyethylene cups were cemented into stable metal-back of acetabular component. The average annual wear of revised cups was 0.32 mm. The annual wear of not revised cups was 0.12 mm. The differences were statistically significant (p = 0.002). The mean area of osteolysis was 472 mm2 (SD 257 mm2). There was no significant correlation between wear and area of osteolysis. There was significant correlation R = 0.54, p = 0.014) between time to revision and area of osteolysis. There were no significant differences of wear of polyethylene inlay or area of osteolysis between stable and unstable acetabular cups.

Long-term outcome of scaphoid nonunion treated by the Matti-Russe operation.

Background. This article presents the results of scaphoid non-union treatment using the Matti-Russe operation. The long-term outcome was compared in patients with bone union and patients with persistent nonunion. Materials and methods. We analyzed 81 cases (80 men, 1 woman) retrospectively. The end point was bone union or persistence of non-union. A long-term follow-up examination was done in 21 patients, with a follow-up ranging from 2 to 27 years (mean 8.8 years). Grip strength was measured with a dynamometer, range of movement was assessed, and the PRWE and DASH scales were used. Radiograms were evaluated for bone union, presence of osteoarthritis and radiolunate angle. Results. Bone union was achieved in 53 patients, persistent nonunion was observed in 23 patients (5 patients presented inadequate data for valid analysis). The long-term outcome was analyzed in 21 patients (14 with bone union and 7 with persistent nonunion). Better results based on subjective patient-rated scales were noticed in the group of bone union (PRWE 14.8, DASH 43.1) than in the non-union group (PRWE 30, DASH 61.8). Grip strength and range of movement were similar. The mean radiolunate angle was 9.6 in the bone union group, and 17.9 in the non-union group. Conclusions. The non-union ratio after Matti-Russe surgery was 28%. Grip strength and range of movement were similar in both groups. The results of the PRWE and DASH scales suggest better clinical outcome in patients with bone union.