Structural integrity of implanted WMT infinity hip and Osteonics Omnifit hip in fresh cadaveric femurs.

Five matched pairs of fresh human femurs were used to quantitatively assess the structural integrity of the implanted Wright Medical Technology modular Infinity hip and the Osteonics single-piece Omnifit hip. The results showed that neither bone implant system was able to recreate the femoral anteversion of the intact femur (p < 0.05).

Patellofemoral joint kinematics and contact pressures in total knee arthroplasty.

Patellofemoral joint kinematics, contact areas, and contact pressures were measured concomitantly before and after total knee arthroplasty in 10 fresh frozen human cadaver knees using an Instron machine, a custom patellofemoral joint testing jig, axial bone markers, a continuous video digitizing system, and Fuji pressure sensitive film. The implant used in this study was the Kirschner Performance Knee System with an all polyethylene, domed patellar component. For all tests, the patella was aligned in its anatomically neutral position.

The influence of fixed rotational deformities of the femur on the patellofemoral contact pressures in human cadaver knees.

Patellofemoral contact pressures resulting from fixed rotational deformities of the femur were studied in human cadaver knees. The increase in the degree of fixed rotational deformities of the femur results in a nonlinear increase in patellofemoral contact pressures on the contralateral facets of the patella (i.e.

Revision arthroplasty facilitated by ultrasonic tool cement removal. Part II: Histologic analysis of endosteal bone after cement removal.

This conclusion of a two-part series examines the effects of ultrasonic cement removal from canine femurs on the underlying endosteal bone. The purpose of the investigation was twofold: to qualitatively assess the immediate in vivo effects on bone of direct coupling as a method of ultrasonic prosthesis removal, and to determine the immediate and delayed histologic responses of cortical bone to ultrasonic cement removal as well as compare the response after cement removal by high-speed burr instrumentation. This histologic study of an in vivo model demonstrated no significant cortical bone damage with the use of ultrasonically driven tools.

Revision arthroplasty facilitated by ultrasonic tool cement removal. Part I: In vitro evaluation.

Ultrasonically driven tools (UDTs) have been developed to facilitate removal of bone cement and securely fixed cemented components during revision arthroplasty. A two-part study was performed to evaluate the efficacy and safety to these tools. Heat generation at the endosteal surface during prosthesis and cement removal with a UDT was examined in an in vitro human femoral revision model.

Fat embolism syndrome following the intramedullary alignment guide in total knee arthroplasty.

Fat embolism syndrome (FES) is a well-known complication of total hip arthroplasty (THA). FES occurs less frequently in total knee arthroplasty (TKA) than in THA. A 67-year-old woman developed FES after placement of the intramedullary femoral alignment guide during TKA.

Potential application of photoplethysmography technique in evaluating microcirculatory status of STAMP patients: preliminary report.

Diabetes mellitus and peripheral vascular disease often lead to infections that result in lower extremity amputations. Transcutaneous oxygen pressure (TcPO2) has been shown by many investigators to be a highly reliable means of assessing cutaneous blood supply and, thus, predicting healing potential. However, TcPO2 measurements are time-consuming and subject to technical difficulties.

Transfer of vascularized grafts of iliac bone to the extremities.

We treated sixteen patients, all of whom had a large segmental defect of bone in an extremity, with transfer of a vascularized graft of the iliac crest. Thirteen patients had an open defect that required an osteomuscular or osteocutaneous graft; the other three had a closed segmental osseous defect and the graft of the iliac crest was transferred without soft tissue. The average length of the osseous defect was seven centimeters.

Infected total hip arthroplasty due to Actinomyces israelii after dental extraction. A case report.

Late infection of a total hip arthroplasty after dental extraction has been reported, but never with an organism that is found exclusively in mouth flora. Actinomyces israelii is an organism responsible for dental caries. A 61-year-old woman developed an infected total hip arthroplasty after dental work.

Microvascular reconstruction for close-range gunshot injuries to the distal forearm.

Three patients with compound defects in the distal forearm resulting from close-range gunshot injuries were treated with a free microvascular composite groin flap. The composite flap, which consisted of groin skin, the iliac crest, and abdominal muscles, was used to cover the exposed nerves, tendons, and vessels in one stage. The iliac crest replaced the segmental radial and ulnar defects, and the attached muscles were placed deep to the tendons to provide a gliding surface and to prevent adhesions to the bone.

Compression arthrodesis of the ankle following failed ankle arthroplasty using hoffmann® external fixation.

Nine patients with failed Irvine Total Ankle Arthroplasties have been treated by compression arthrodesis with Hoffmann external fixators. Six were men and three were women; ages ranged from 33 to 70 years. An anterior approach was used with application of a Hoffmann external fixator.

A review of delayed unions of open tibia fractures treated with external fixation and pulsing electromagnetic fields.

Seventeen cases of open tibia fractures complicated by delayed union were reviewed. Only severe injuries requiring external fixation for tissue management and multiple surgical procedures were included in this study. All were ultimately treated with pulsing electromagnetic fields.

Use of the Hoffmann external fixator in the treatment of femoral fractures.

The Hoffmann external fixator has proved to be an effective means of stabilizing complex femoral fractures in patients in whom prolonged traction or internal fixation is not advisable. It provides for the prompt mobilization of multiple-trauma victims and assists in the evaluation of the "floating knee." Pin tract infections and lack of stability or adaptability of the frame are not major problems.

Evaluation of the pritchard total elbow arthroplasty.

Total elbow arthroplasty is a valuable therapeutic modality in incapacitating degenerative joint disease from rheumatoid arthritis. This study is a retrospective analysis of 17 elbow arthroplasties in 13 patients with rheumatoid arthritis using the Pritchard elbow prosthesis. The Pritchard elbow prosthesis has several distinctive design features.

Use of the Hoffmann apparatus in myocutaneous pedicle flap.

The use of the Hoffmann apparatus has been extended to include primary cross-leg myocutaneous flaps. Three patients are presented with severe soft-tissue loss to the lower extremities. The Hoffmann apparatus was used for stabilization and proved to be very beneficial for neurovascular monitoring, graft and wound care, and patient comfort.

Results of patellar realignment in patients older than thirty.

A retrospective study of patellar realignment procedures was performed on patients over the age of 30 years, with a mean follow-up of 32 months on 16 operated-on-knees in 14 patients. The best results were achieved in patients with preoperative apprehension and compression signs, as well as a typical history for patellar subluxation. when these signs were absent after operation, the result was better than seen in patients whose clinical signs persisted.

Two consecutive repairs of the lower limb with a single gastrocnemius musculocutaneous cross-leg flap.

The medial gastrocnemius musculocutaneous flap and the Hoffmann apparatus give new freedom of action in the design of cross-leg flaps. In a patient with two lower limb defects, consecutive transfer of the same flap to both defects was carried out without incident, and the Hoffman apparatus was removed on the sixteenth postoperative day.

Surgical management of osteochondritis dissecans of the capitellum.

Ten cases of osteochondritis dissecans of the humeral capitellum which were treated surgically are reviewed. All 10 cases were males and involved the dominant side. The ages at surgery ranged from 13 to 17 years.

UCI knee replacement.

Between March 9, 1972 and December 31, 1973, a total of 103 UCI knee replacements were performed. Follow-up data are available on 83 knees with an average follow-up of 33 months. Patient evaluation of the end results indicates that 78.