Biomedical subjects

J Benevenia

Publications and source records attributed to J Benevenia.

22 records · Page 2Linked to original sources

PubMed1990

A comparative analysis of Ender's-rod and compression screw and side plate fixation of intertrochanteric fractures of the hip.

The purpose of this study is to compare the results of compression screw fixation and Ender's rods in the treatment of intertrochanteric fractures of the hip. A retrospective analysis of 77 cases of both unstable and stable cases of intertrochanteric fractures showed a higher incidence of complications in the Ender's group; these included backing out, distal femur fracture, need for a secondary procedure, external rotation deformity, and knee pain. Indications for the use of Ender's rods may be found among patients with burns, soft-tissue injuries of the proximal thigh, and patients refusing blood transfusions. Wiring of the distal ends of Ender's rods prevents backing out of the rods. Dacron tape has also been successfully used to prevent the distal ends of the rods from backing out in the last six of the 77 cases. The compression hip screw is a preferred treatment of choice in both stable and unstable intertrochanteric fractures.

Aged↗

PubMed1989

Distal screw targeting of interlocking nails.

Successful placement of the distal interlocking screws into the Grosse-Kempf nail is a demanding procedure due in part to deformation of the nail during insertion and to inaccuracy of the targeting device supplied with the system. The authors suggest an alternative approach. After placement of the nail in a tibia or femur, a Kirschner wire (K-wire) is directed through the distal transfixation hole under fluoroscopic control. A second Grosse-Kempf nail is placed alongside the limb with the K-wire passing through the corresponding distal hole. The more proximal hole on the nail serves as a targeting guide for a more proximal wire. Once correct placement of the wires is confirmed roentgenographically, the near cortex is opened with a cannulated drill passed over the wires. The wires are removed, the opposite cortices are drilled, and the screws are placed. In 25 consecutive distally locked nailings (eight tibiae and 17 femora), the technique was easily mastered, decreasing the roentgenogram exposure when compared to freehand techniques.

Bone Nails↗

PubMedDate not supplied

Synovial sarcoma: frequency of nonaggressive MR characteristics.

PURPOSE: Our objective was to examine the MR characteristics of synovial sarcoma and determine the frequency of a nonaggressive imaging appearance. METHOD: Fifteen patients with histologically confirmed cases of synovial sarcoma and prior MR examinations were seen. Retrospective analysis of imaging features included assessment of size, margins, homogeneity, internal architecture, T1- and T2-weighted signal intensities, and bone invasion. RESULTS: Five of 15 patients (33%) had well circumscribed, homogeneous lesions with a mean length of 4.8 cm. The T1-weighted signal intensity was either isointense to muscle or greater in signal intensity than muscle. The T2-weighted images demonstrated signal intensity equal to or greater than fat. The remaining 10 lesions were larger (mean length of 11.3 cm) with mild to complex levels of inhomogeneity and margins that varied from well circumscribed to infiltrating. CONCLUSION: There are two sets of MR features seen with synovial sarcoma. Small lesions of -5 cm can demonstrate a nonaggressive appearance with well circumscribed margins and homogeneous signal intensity. These tumors could be confused with benign lesions, resulting in inappropriate surgical intervention like excisional biopsies through transverse incisions. This would make future surgery more difficult. Larger lesions tend to be more heterogeneous in signal intensity.

Adipose Tissue↗

PubMedDate not supplied

Primary epiphyseal transplants and bone overgrowth in childhood amputations.

Seventeen children aged newborn to 14 years underwent major through-bone amputations or revision at our two institutions. Ten patients (group 1) had primary autogenous epiphyseal transplants taken from the amputated limb and used to cap the open medullary canal of the residual limb. Seven patients (group 2) did not have epiphyseal transplants. Nine of 10 patients in group 1 (90%) had no problems related to bone overgrowth or delay in prosthetic fitting. In group 2, six of seven patients (86%) had clinically symptomatic bony overgrowth of 20 months after the index amputation on the average. Four patients had surgical revisions. Therefore, provided healthy autogenous donor epiphyses are available, we recommend primary epiphyseal transplants to avoid the complications of bone overgrowth in childhood through-bone amputations.

Adolescent↗