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Biomedical subjects

U Lanz

Publications and source records attributed to U Lanz.

At least 91 records · Page 5Linked to original sources
PubMed1990

[Clinical anatomy of the digital connective tissue cord of the ulnar side of the little finger].

A fibrous cord with a length of nearly 60 mm and a width of 3 mm consistency starts near the insertion of the abductor digiti minimi muscle at the ulnar border of the little finger. The fibers pass parallel to the longitudinal direction of the little finger and at the level of the osseous ridges on the palmar side of the flexion-extension axis of the finger joints. Proximally the cord receives fibers from the periosteum at the base of the proximal phalanx, from the ulnar end of the natatory ligament, and from the pretendinous fibers of the A1 pulley. Distally the digital cord has connections to the cutaneous ligaments of Grayson and Cleland. The cord also joins the flexor tendon sheath, the neurovascular bundles, and the skin. Sometimes these cords are involved in Dupuytren's contracture.

Adult↗
PubMed1990

CT morphology of benign median nerve tumors. Report of three cases and a review.

Computed tomography (CT) was performed in 3 patients with benign tumors of the median nerve, histologically confirmed as neurilemmoma, fibrolipoma and hemangioma. The neurilemmoma showed a ring-shaped contrast enhancement. The fibrolipoma presented with areas of solid soft tissue and areas of fat. The hemangioma was a solid tumor with a lacunar, vascular contrast enhancement. According to our experience and to the previous literature CT gives useful information regarding the anatomic location, size, and relationship of peripheral nerve sheath tumors to surrounding structures, and may help to differentiate between various tumor types.

Adolescent↗
PubMed1989

[Computerized tomography of the hand: examination technic, normal anatomy, indications].

The results of 480 computed tomograms carried out in the hand are presented. The digital slice imaging technique shows following advantages: a) Imaging of the complex carpus without superimposition giving a better understanding of carpal biomechanics. b) Anatomically exact imaging of the soft tissues determined by density analysis. In the following states relevant information can be obtained by CT of the hand: 1. Posttraumatic states of the carpus such as scaphoid non-union, lunato-malacia in stages I and II, complex fracture dislocations, and carpal instabilities; 2. cystic transformation of the bone; 3. non-idiopathic CTS; 4. clinically unequivocal soft-tissue masses. In our institution conventional tomography has been largely replaced by carpal CT within a progressive diagnostic programme. Today CT is the best method for imaging soft-tissue masses of the hand.

Carpal Bones↗
PubMed1988

[Computed tomographic findings in carpal tunnel syndrome].

Morphometric measurements of the carpal bones were carried out in 32 patients with carpal tunnel syndrome (CTS) and in 47 normal persons, using high resolution CT. Measurements of distances and areas were carried out at the entry of each carpal tunnel and at its narrowest point. In idiopathic CTS there were no significant differences in these measurements from normal carpal measurements. The situation was different in ten patients with nonidiopathic CTS; in these CT showed the cause of median compression reliably. Our results suggest that there are no indications for performing CT of the wrist in idiopathic CTS, but that valuable information may be expected from CT in cases of nonidiopathic CTS.

Carpal Bones↗
PubMed1988

[How reliable is microvascular surgery?].

Although in experimental microsurgery a patency rate of almost one hundred percent can be obtained, in clinical experience we now and then encounter a failure where circulation cannot be restored for reasons not known. Cold agglutinins, deficiency of Antithrombin III, and irreversible spasm of the vessel wall may be some of the factors which prevent the restoration of circulation in cases of replantation and free tissue transplantation. It is suggested that we collect such cases in a combined effort to find out more about possible causes.

Adult↗
PubMed1988

[Morphometry using computerized tomography of the wrist in idiopathic carpal tunnel syndrome. Comparison of pre- and postoperative findings].

Alteration of carpal morphometry after surgical release of the carpal tunnel was investigated in 22 patients with idiopathic carpal tunnel syndrome, using pre- and postoperative computed tomography. The morphometric evaluation showed an increase in carpal volume which was due to a palmar soft-tissue prolapse in 90% and to an increase of the carpal arch cross sectional area in about 10%. The carpal tunnel release caused a palmar opening of the canal most commonly at the pisiform bone. There was also a variation in form and an increase in volume of Guyon's canal. The results are discussed and related to the postoperative complaints.

Adult↗
PubMed1987

[Pseudarthrosis of the scaphoid bone and carpal instability. Correlations--development--consequences].

In combination with its ligamentous connections, the scaphoid bone represents an essential stabilizing factor within the wrist. This stabilizing function disappears after trauma causing a displaced fracture of the scaphoid bone or extensive rupture of ligamentous structures fixing the scaphoid in its position. Hence carpal instability results, detectible radiographically by alteration of defined wrist angles. Since this is so, one might suppose that, together with other wellknown reasons, carpal instability would be of great importance in the development of a scaphoid nonunion. However, after evaluation of 76 cases, a scaphoid nonunion with carpal instability was found in only 27.6%. Moreover, surgical treatment of the scaphoid nonunion alone does not correct the abnormal wrist angles. Despite this observation, we do not consider simultaneous ligamentous repair to be necessary, because few problems remained after bony healing in such cases.

Adolescent↗
PubMed1987

[Vascular spasms in microsurgery].

Human arteries and veins contract with hypoxia and deprivation of substrate provoked by increasing calcium inflow into the cell and reduced energy. Such spasm may be eliminated by phosphoenolpyruvate which loads up the cell's energy, blocking glycogen reduction at the same time. Reperfusion will then guarantee a sufficient energy stroke. Therapy should pursue the following steps: 1. Phosphoenolpyruvate infusion (1 X 10(-6) up to 1 X 10(-3) gm/ml in tyrodes solution pH 7.3) into the arterial branch, proximal and distal to the injury. 2. Subsequent treatment with vasodilating drugs and rheologically active substances. 3. Failed therapy after more than three hours warm ischemia could be due to autolytic processes and requires resection of the affected vessel. 4. The imbalance of the thrombolytic system with the so-called no reflow phenomenon could be due to a plasminogen activator's inhibitor released during hypoxia. Such cases may reasonably be treated by urokinase or by streptokinase plasminogen complex.

Adenosine Triphosphate↗
PubMed1985

[Glide amplitude of flexor and extensor tendons of the fingers of the human hand].

The gliding amplitude of the flexor and extensor tendons of the finger muscles were determined in the human hands of adults. The carpometacarpal transition area and also the middle zone of the proximal and middle phalanx were appointed as measuring marks. In the main the amplitudes on the flexor side are constantly greater than on the extensor side. Because the movements decrease from proximal to distal, also the gliding range during tendon excursion lessens in the proximo-distal direction. In the case of replantation the extensor tendons should be shortened by the same amount as the bone. To relieve tension in the suture, the flexor tendons should be kept at their original length.

Aged↗
PubMed1985

[Abrasion injury: combined burn injury of the hand].

In an abrasion injury loss of tissue is combined with a marginal burn. The wounds should be primarily excised and adequately covered with a soft tissue flap. There may arise difficulties in evaluating the heat injury to the bone. The debridement of the bone should be completed by an early second-look operation to prevent delayed healing due to the wound infection.

Adult↗
PubMed1984

[Stenosing tendovaginitis of the flexor carpi radialis tendon].

Pain at the radial side of the wrist may be caused by stenosing tenosynovitis of the flexor carpi radialis tendon. Typical in these cases is a tenderness over the tendon at the wrist. Pain is most often produced by pronation and especially by palmar flexion against resistance. The condition is caused by narrowing of the canal of flexor carpi radialis tendon within the wrist by nonspecific synovitis. In some cases osteoarthritis of the joint between the scaphoid and trapezium can compress the tendon and cause its attrition. If the pain is not relieved by conservative methods it can usually be cured by operative decompression of the canal.

Constriction, Pathologic↗