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Biomedical subjects

D Kohn

Publications and source records attributed to D Kohn.

At least 199 records · Page 11Linked to original sources
PubMed1977

Semiquantitative cytochemical estimation of beta-glucuronidase activity in peripheral lymphocytes in healthy human subjects.

A semiquantitative cytochemical evaluation of beta-glucuronidase activity in peripheral lymphocytes in 123 normal sybjects was made. It was found that the enzymatic activity was influenced by age but not by sex. Activity was weak in newborn infants but increased with age and reached maximal values in old subjects. Age should therefore be taken into consideration when the enzyme activity is evaluated.

Adolescent↗
PubMedDate not supplied

Preoperative ultrasonographic mapping of calcium deposits facilitates localization during arthroscopic surgery for calcifying tendinitis of the rotator cuff.

Calcifying tendinitis is a relatively common disorder of the rotator cuff. For symptomatic patients, excision of the calcium deposits offers reliable pain relief. The arthroscopic technique is demanding. Arthroscopic localization of the deposit is frequently demanding. The technique described in this article facilitates the localization of calcium deposits based on preoperative ultrasonography. Knowing the exact topography of the deposit relative to the visible landmarks allows the surgeon to localize the site of the deposit from the intra-articular view. Probing the rotator cuff with a spinal needle and looking for calcific material at the tip of the needle is an important step in verifying the location of the deposit.

Arthroscopy↗
PubMedDate not supplied

Benign giant-cell tumor of the patellar ligament.

We report the symptoms, clinical findings, and treatment of a patient with an extra-articular benign giant-cell tumor of the patellar ligament. Between the years 1966 and 1996 no similar case has been found to be documented by a Medline search. On palpation, a soft, mobile lesion, the size of a pigeon's egg, was felt in the lateral region of the patellar ligament. There was no set of laboratory values to determine the diagnosis. In addition, there were no typical findings in diagnostic imaging procedures and it seems that the most important fact is that the clinician is aware of this type of synovial tumor. A clear diagnosis is only possible by means of a pathological investigation. The choice of therapy for giant-cell tumors is local excision. Arthroscopy is recommended exclusively for the diagnosis and therapy of a localized intra-articular giant-cell tumor.

Adult↗
PubMedDate not supplied

Hip arthroscopy without traction: In vivo anatomy of the peripheral hip joint cavity.

PURPOSE: To describe the in vivo anatomy of the peripheral compartment of the hip joint using a systematic sequence of examination without traction. TYPE OF STUDY: Case series. METHODS: We performed 35 hip arthroscopies without traction from an anterolateral portal in the supine position. Free draping and a good range of movement of the hip joint were used to relax parts of the capsule and increase the intra-articular volume of the area that was inspected. Each procedure was documented on a standard protocol including detailed information on technical features and normal and pathologic intra-articular findings. RESULTS: A comprehensive inspection of the peripheral compartment was obtained from the anterolateral portal. A systematic sequence of examination was developed separating the periphery of the hip joint into 7 areas: anterior neck area, medial neck area, medial head area, anterior head area, lateral head area, lateral neck area, and posterior area. The arthroscopic in vivo anatomy of each area is described. In 3 patients, 1 to 3 loose bodies were removed. In 1 patient with a synovial chondromatosis, 40 chondromas were retrieved. In osteoarthritis, impinging osteophytes were trimmed in 3 cases and partial synovectomy was performed in 10 patients. The following complications were observed: a temporary sensory deficit of the lateral femoral cutaneus nerve in 1 patient, scuffing of the anterior surface of the femoral head in 3 patients, detaching of an osteophyte in 1 patient, and partial tears of the anterior synovial fold in 10 patients. CONCLUSIONS: Arthroscopy without traction allows for a complete evaluation of hip anatomy without the loaded articular surfaces, the acetabular fossa, and the ligamentum teres. For a complete overview of both the central and peripheral part of the hip, traction is necessary for the central part.

Arthroscopy↗
PubMedDate not supplied

[Significance of the hypoechoic area around the long biceps tendon in shoulder sonography--underlying pathology].

OBJECTIVE: The objective was to evaluate the sonographic sign of a hypoechoic area ("halo-sign") around the long biceps tendon as an equivalent of intraarticular effusion. METHODS: Part 1: Ten patients scheduled for shoulder arthroscopy underwent ultrasonography immediately before surgery. If there was no hypoechoic area around the long biceps tendon 30 ml of NaCl-solution (0.9%) were injected into the joint. After repetitive passive motion the patient underwent a second ultrasonography. Part 2: Ten consecutive patients with a hypoechoic area around the long biceps tendon underwent shoulder arthroscopy. During this procedure they were examined for intraarticular effusion. Patients with rheumatoid disease were excluded from the study. RESULTS: Part 1: In 9 of 10 patients a hypoechoic area around the long biceps tendon was induced by injection into the joint. The area was 1.07 +/- 0.13 cm2. In one case we could not induce the described phenomenon. Part 2: In all patients with a hypoechoic area around the long biceps tendon an intraarticular effusion was found at arthroscopy. CONCLUSION: A hypoechoic area around the long biceps tendon correlates with fluid in the synovial sheet and indicates effusion within the glenohumeral joint.

Arthroscopy↗
PubMedDate not supplied

[High tibial osteotomy--primary stability of several implants].

INTRODUCTION: High tibial osteotomy in varus knee has been performed for a long time. Several newer operation techniques have been established in recent years. We tested the primary stability of several of these techniques in vitro. MATERIAL AND METHODS: 10 human cadaveric fresh-frozen specimens were tested with a mean age of 61 years (range 50-72 years), and weight of 65 to 78 kg. The following implants were tested: One-third-tubular plate with cortical screw (AO, Synthes), blade plate with screws (Giebel's plate, Link), bone staples (osteotomy staples, Krackow staples, Smith & Nephew), external fixateur (Orthofix). The specimens were fixed in metal cylinders and then loaded in two different apparati: Shear forces were applied to the osteotomy site by hanging weights parallel to the osteotomy plane in a static-loading frame, and axial forces were applied by a materials testing machine (Zwick). Load displacement was recorded by inductive displacement transducers. RESULTS: The highest stability was achieved by the external fixateurs and the bone staples. Giebel's plate and the one third tubular plate were less stable. Receipt of the medial corticalis was decisive for primary stability of the implants. CONCLUSION: The clinical significance of the results is limited by the relevance of the protocol, which for practical reasons did not account for the soft tissue situation around the knee. Thus, primary stability of the tested devices was generally comparable as long as they were correctly implanted. It was found, that lateral distance of the osteotomized bone should not exceed 3 mm. If the medial cortical is sawed, another medial implant is necessary to ensure sufficient primary stability.

Aged↗