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Biomedical subjects

U Holz

Publications and source records attributed to U Holz.

At least 19 recordsLinked to original sources
PubMed1992

[Isolated injury of the subscapular muscle tendon].

Avulsion of the subscapularis tendon is caused by a combined abduction and external rotation trauma of the upper limb. Weakness of internal rotation and a positive apprehension test are clinical signs of the injury. A fracture of the lesser tuberosity in the x-ray film or a disruption of the subscapularis tendon documented in dynamic sonography of the shoulder clarify the diagnosis. Operative treatment is indicated of prevent weakness of internal rotation as well as anterior instability. This recommendation is supported by four cases with full range of motion and good anterior stability after surgery.

Adolescent↗
PubMed1992

[The treatment of distal radius fractures using the external fixator].

This is a report on the stabilisation of fractures of the distal end of the radius type C2 and C3 and open fractures by external fixator. Between 1982 and 1989 38 patients with 43 fractures were treated. A follow-up was done 8 to 80 months after operation including 35 patients. 14 patients were polytraumatised. Especially in this group of patients, the advantages of this procedure can be seen. This advantages are a small stress for the patient, involving only a short time of assembling of the external fixator besides a high stability of the system. Our results show, as well as the results of the literature, that the external fixator has its place in a differentiated therapeutic concept of intraarticular fractures, open fractures and fractures with a defect of the distal radius.

Adult↗
PubMed1991

Bone morphogenetic protein: a review.

The osteogenic potential of bone and bone matrix has been characterised only by its biological effects and the parameters influencing it. Recently, the osteoinductive ability of bone matrix had been defined chemically by the description of a bone morphogenetic protein (BMP), and the parameters of osteogenic factors from different species have now been recognised. The current state of isolation, purification and characterisation of these factors is summarised in this review. General aspects of the isolation and testing of BMP preparations, and the results of orthotopic application of BMP implants, including clinical cases, are reported.

Animals↗
PubMed1991

[Primary valgisation osteotomy in femoral neck fractures].

Technique and results after primary valgisation osteotomy in 41 patients with femoral neck fractures are described. 2 non unions and 9 avascular femoral head necroses were observed. The primary valgisation most probably does not influence the rate of necrosis. When performed by accurate technique it lowers the incidence of non union of the femoral neck. Postoperative leg lengthening is always evident. The most current avoidable mistake is an external rotational deformity. The procedure requires proper preoperative planning.

Adult↗
PubMed1991

[Elbow dislocation with fracture of the coronoid process and comminuted fracture of the radius head].

In fractures of the elbow with an associated fracture of the coronoid process, the size of the coronoid fragment determines the stability of the joint. A diminution of the arch of the incisura semilunaris by about 30 degrees causes instability of the elbow. We present an alternative way of treating the special case of a fracture of the coronoid process combined with comminuted fracture of the proximal end of the radius. A suitable fragment of the head of the radius is used to reconstruct the coronoid process. The stability achieved allows early functional postoperative treatment with a good range of movement at the elbow joint.

Aged↗
PubMed1990

[Advantages and disadvantages of various kinds of anesthesia in reposition of distal radius fracture].

The fundamental differences of general anesthesia and somatic blockade have to be considered. When selecting the method of anesthesia to reduce distal fractures of the radius. Brachial plexus block and local anesthesia within the therapeutic dose of the drug leave vital centers intact and metabolism undisturbed. Somatic blockade can be applied without further investigations when urgency is indicated. If an anesthesiologist is not present, the surgeon can apply the method. Experience reduces the rate of drawbacks.

Anesthesia, Conduction↗
PubMed1990

[General principles and technics of osteosynthesis in pathological fractures].

Skeletal metastasis and pathologic fractures are signs of progressing neoplastic disease, but they are not life threatening events. Stabilization is necessary to diminish pain and to maintain the quality of life remaining. Principles of surgical stabilization include rigidity for long term functional use, non dependence on bone healing and salvage of as much bone as possible to maintain muscle attachment for limb function. This is achieved by integration of bone, Polymethylmethacrylate and implant into a solid unit. In the treatment of pathologic fractures not caused by malignancy biologic factors like bone transplantation play the predominant role. In case of infection stability and vascularity of the bone is of utmost importance. Vascularity is achieved by pediculated grafts or free tissue transfer.

Bone Neoplasms↗
PubMed1989

[Fatigue fracture of the femoral neck in a recreational runner. A case report].

A report about a hobby runner's femoral neck fatigue fracture is presented. Femoral neck fatigue fractures are rare injuries. Young soldiers occasionally are involved. The under-evaluation of pains in the inguinal region delies the diagnosis. The femoral neck breaks under cyclic load. Therefore the operative treatment is necessary though the injury could be treated conservatively during early stage.

Adult↗
PubMed1989

[Differentiated therapy of distal radius fracture].

The fracture of the distal radius loco typico is one of the most frequently occurring fractures. This article presents types of fractures, in particular Colles', Smith's, Barton's and multiple-fragment's fractures. Conservative and operative treatment is described, as well as problems related to the different procedures. Besides fracture retention by plaster splint or cast, Besides fracture retention by plaster splint or cast, transcutaneous osteosynthesis by Kirschner wire, lag screws, osteosynthesis by buttress plate and the use of the external fixator are described as examples of operative therapeutics.

Bone Nails↗
PubMed1989

[Differential diagnosis of shoulder dislocation with special reference to posterior dislocation].

Evaluation of a dislocated shoulder must classify the direction of dislocation and describe additional injuries as well as the recurrence rate. This is required in all types of dislocations by recording the case history in detail, and by examining the shoulder clinically as well as radiographically in two planes. Ultrasound and arthro-computer tomography are valid methods to demonstrate injuries of bony and ligamentous structures. They may therefore influence surgical treatment. In posterior dislocation of the shoulder quite often early diagnosis is missed. If this injury is suspected, careful clinical and radiographical evaluation is most important.

Adult↗
PubMed1989

[General principles and techniques of osteosynthesis in pathologic fractures].

Skeletal metastasis and pathologic fractures are signs of progressing neoplastic disease, but they are not life-threatening events. Stabilization is necessary to diminish pain and to maintain mobility. Principles of surgical stabilization include rigidity for long-term functional use, nondependence on bone healing and salvage of as much bone as possible to maintain muscle attachment for limb function. This is achieved by integrating bone, polymethylmetacrylate and implant into a solid unit. In the treatment of pathologic fractures not caused by malignancy biologic factors such as bone transplantation play a predominant role. In case of infection stability and vascularity of the bone is of utmost importance. Vascularity is achieved by pediculed or free-tissue transfer.

Bone Neoplasms↗
PubMed1988

An evaluation of retrieved UHMWPE hip joint cups.

In this study it is demonstrated that the combined chemical and mechanical influences of the implant situation cause property changes of ultra-high-molecular-weight polyethylene (UHMWPE) hip joint cups. Nearly 250 loosened hip cups, retrieved 3 weeks to 14 years after implantation, were investigated. The clinical long-term behavior of various shaped polyethylene hip sockets are statistically analyzed. The main damage features were defined and described. Density measurements show a density increase with implantation time and a dependence of these changes from implant position and loading conditions. The rate of extractable constituents also increases with course of time. An increased in vivo conditioned oxidation of the UHMWPE can be demonstrated by infrared (IR) spectrometry. The density increase can be explained by post-crystallization, which is the result of oxidative chain scission. This leads to a reduction of the average molecular weight of the PE and to an increased extractability of constituents. Since these changes have been recognized as the reasons for aging and failing of UHMWPE, the methods of material characterization used in this study for retrieved implants will help to develop suitable in vitro testing and simulating methods. Characteristic damage features of hip cups allow direct relationships with construction characteristics and their improvement.

Hip Prosthesis↗
PubMed1988

[Subcutaneous tendon ruptures of the upper arm].

25 subcutaneous tendon ruptures of the upper arm were operatively treated between 1982 and 1985. The long biceps tendon was ruptured fifteen times, the distal biceps tendon eight times and the triceps tendon twice. Operative procedures and the functional results are described. The follow-up investigation was undertaken on an average of 14 months after operation. Mechanism of injury and variations of histological findings in the different tendons are compared. The functional results are good. The operative treatment of subcutaneous tendon ruptures of the upper arm is therefore recommended.

Adult↗
PubMed1988

[Treatment of the open tibial fracture with the fixateur externe with special reference to osteosynthesis of the fibula].

In the treatment of open fractures of the lower limb and of fractures combined with severe damage of soft tissues, external fixation is favoured. Additional soft tissue damages in the compartments of the lower limb are avoided by using an external fixation in form of a clamp. In defect fractures, shattered fractures and in all fractures in the distal third the stability of clamp fixation is enhanced by plating of the fibula. Furthermore by osteosynthesis the reconstruction of the correct length of the lower limb can be performed. 36 fractures healed definitively in an average of 17.1 weeks by this procedure. Secondary procedures were: 8 cases with decompression of compartments, 11 cancellous bone grafts, 13 fixateur externes were removed because of the infection of the Schanz'screws, and healing was achieved by using a plaster cast. The therapeutical procedure was changed in 5 patients to a plate osteosynthesis and in 8 patients to an intramedullary nail.

Adolescent↗
PubMed1988

[Indications for operation in elbow dislocation].

This paper briefly presents the anatomy of the elbow joint, its pathophysiology, the various types of dislocation of the elbow joint and concomitant injuries, the appropriate diagnostic procedures and the indications for surgery and the operative technique applied for correction of dislocation. The only urgent indications for operative treatment are elbow joint dislocation with concomitant bone injuries, persistent instability or luxation position, open injuries and vessel and/or nerve injuries. For purely ligamentous lesions combined with relative loss of stability an operative procedure does not seem necessary. The operative technique applied for the treatment of habitual or recurrent dislocation is also described.

Humans↗