[Paraosteal osteosarcoma of the tibia treated with the OSS prosthesis. Case report]. / Osteosarcoma paraostal de tibia, tratamiento con prótesis OSS. Reporte de un caso.

Parosteal osteosarcoma originates on the surface of long bones and spares the medullary canal. Its peak incidence occurs in the third decade of life and it is more frequent in females than males. The juxtacortical variety of parosteal osteosarcoma is one of the most common ones, accounting for 1-6% of all osteosarcomas. The classical radiographic appearance of osteosarcoma includes high ossification density and a lobed mass, usually in the posterior aspect of the distal femur, sparing the medullary canal. We report herein the case of a 31 year-old male patient with a clinical picture that included left knee pain and who was seen as outpatient. He was started on treatment for enbloc resection of the tumor and implantation of the OSS (Orthopedic Salvage System) prosthesis. Treatment consisted of broad resection of the proximal tibia, of approximately 14 cm, as well as the implantation of a nonconventional modular tibial prosthesis. Both the radiographic and the clinical results were good and appropriate at the three week follow up.

[Rotator cuff plasty with the suture bridge technique]. / Plastía de manguito rotador con técnica de sutura puente bridge.

OBJECTIVE: To assess the clinical results and integrity of arthroscopic repair of rotator cuff tears using the suture bridge technique. MATERIAL AND METHODS: Fifty-six shoulders with total thickness rotator cuff tears were assessed. Mean follow-up was 19 months. Repair integrity was analyzed postoperatively with imaging and recovery times. RESULTS: The University of California at Los Angeles scale was used during the followup; the preoperative mean improved from 13.2 points to 29.7 (p\001). The rotator cuff healed completely in 66.7 of the 56 shoulders. The incidence of fatty regeneration of rotator cuff muscles was more common in individuals > 60 years of age (p = 0.002). The latter had a higher chance of recurrent tear (p\001). DISCUSSION: There was significant pain relief in the visual analogue scale and improvement in ranges of motion. The advantages of this technique include that it allows immobilizing with a sling without the need for maximum abduction protection; it is a safer repair due to the configuration of the double band intercrossed over the tendon that provides greater fixation and stability, with greater coverage of the tear defect.