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Biomedical subjects

K A Riel

Publications and source records attributed to K A Riel.

At least 19 recordsLinked to original sources
PubMed1999

0.2-Tesla magnetic resonance imaging of internal lesions of the knee joint: a prospective arthroscopically controlled clinical study.

The results of magnetic resonance imaging (MRI) were compared with those of arthroscopy in a prospective series of 244 patients. A dedicated system for MRI of limbs and peripheral joints--the 0.2-T Artoscan (Esaote, Italy)--was used for imaging knee joint lesions. T1-weighted spin-echo sagittal images, T2-weighted gradient-echo coronal images, and axial views for lesions of the femoropatellar joint were acquired. Paraxial sagittal and oblique coronal views were obtained for imaging of the cruciate ligaments. This protocol allowed excellent visualization of the cruciate ligaments and medial and lateral meniscus in almost all patients. Compared with arthroscopy performed within 48 h after imaging, the sensitivity, specificity, and accuracy were respectively 93%, 97%, and 95% for tears of the medial meniscus; 82%, 96%, and 93% for tears of the lateral meniscus; 100%, 100%, and 100% for tears of the posterior cruciate ligament; 98%, 98%, and 97% for tears of the anterior cruciate ligament; and 72%, 100%, and 92% for full-thickness articular cartilage lesions. The examination can be performed within 30-45 min at lower cost than diagnostic arthroscopy. MRI with a 0.2-T magnet is a safe and valuable adjunct to the clinical examination of the knee and an aid to efficient preoperative planning.

Adolescent↗
PubMed1998

[Augmented anterior cruciate ligament replacement with the Kennedy-LAD (ligament augmentation device)--long term outcome].

The ligament augmentation device (Kennedy-LAD) is used to protect tendon grafts during the posttransplantation decrease in strength in anterior cruciate ligament (acl) reconstructions. The augmentation with the LAD is based on the concept of load sharing. Since 1983 we used the LAD in acl-reconstructions in 856 patients. In 63 cases we had to treat complications like infection (8), recurrent effusions (21), arthrofibrosis (34). The overall results are good with respect to stability, regain of strength and sports activity. In 73 cases resurgery was necessary because of synovitis (7), LAD-rupture due to re-injury (9), fatigue-rupture of the LAD (22), meniscal tears (35), 2.7 +/- 2.3 years (range: 2 months to 10 years) after LAD implantation. Modern techniques in acl reconstruction lead to comparable results without synthetic augmentation. Therefore, we now recommend the use of a LAD only in cases of repeated acl replacement with week tendon grafts, to avoid an allograft.

Adult↗
PubMed1995

[MRI of the knee joint: first results of a comparison of 0,2-T specialized system and 1,5-T high field strength magnet].

PURPOSE: Diagnostic accuracy and image quality of a specialised system for MR examinations of peripheral joints were evaluated. MATERIALS AND METHODS: 20 patients with acute or chronic injuries of the knee were examined using a low-field MR system (0.2 T). For comparison, all patients were also studied with a 1.5 T high field strength magnet and all diagnoses were correlated with arthroscopic findings. RESULTS: We found compatible diagnostic accuracies (cruciate ligaments 90%, menisci 75-90%) and good image quality ratings for the low field system ("good" and "excellent" image quality in 83% of cases). CONCLUSION: The low-field MR-system offers low-cost MR examinations of peripheral joints with good image quality and reliable diagnostic information.

Adult↗
PubMed1994

[Arthroscopic distension irrigation in acute postoperative infection of the knee joint--long-term follow-up].

Between 1983 and 1993, 26 patients, 12 patients from our clinic and 14 referred patients, had to be treated because of a septic knee joint following open ligament repair or subsequent arthroscopic surgery. Immediately after arthrocentesis for synovial-fluid analysis a distension-irrigation system was established under arthroscopic control as described by R.W. Jackson. Three tubes were placed into the knee joint cavity. One was used for inflow and the other two for outflow. Distension was performed by open inflow and closed outflow tubes each second hour for 10 to 15 min. Systemic antibiotics were administered. In 22 aspirated materials the cultures revealed bacteria: mostly staphylococcus aureus (65%). In two cases in which irrigation of the knee-joint infection was performed later than the 10th postoperative day a relapse of the infection occurred and required a complete debridement and synovectomy. During follow-up period three patients underwent second look arthroscopy due to meniscus tear, rupture of an ACL reconstruction and synovial proliferation. 7 +/- 3 (2-13) years after treatment, 24 patients were re-examined, all had x-rays and 11 patients had a MRI of the knee joint additionally. 19 patients showed excellent or good results: no complaints, full ROM, no signs of osteoarthritis on x-rays and nearly normal participation in sports 4 out of 11 patients had signs of cartilage lesion and synovial proliferation. This retrospective study indicates that the distension-irrigation system is successful only in early acute cases of knee-joint infections of postoperative origins.

Adult↗
PubMed1993

[Simple elbow dislocation. Comparison of long-term results after immobilization and functional treatment].

From 1976 to 1985 the treatment used for simple dislocation of the elbow consisted in closed reduction and immobilization for about 3-4 weeks. Since 1985, simple dislocation of the elbow has been treated with closed reduction and immobilization for fewer than 3 days. A group treated by immobilization (20 patients) and a group that underwent functional treatment (24 patients) were both evaluated with regard to elbow motion, instability, isometric flexor and extensor strength of the forearm, and subjective (patient) judgement of the elbow function. An average of 8 +/- 5 years after the treatment 39 elbows were re-examined. In both groups, results were generally good, 22 patients having no residual symptoms or signs. However, 17 did have symptoms: 6 patients had a slight (loss of extension < 10 degrees, loss of flexion < 10 degrees) and 1 patient a moderate decrease in the range of motion (loss of extension > 10 degrees). Some instability was found in 5 patients and strength was slightly decreased in 9. The subjective judgement on their elbow function was very good in 22 patients. At follow-up, no statistically significant differences were found between the two groups. The retrospective study, however, revealed that immobilization for 3-4 weeks more than doubled the time of after-treatment, the period of disability of the elbow, and the period of physical rehabilitation. Therefore, an accelerated functional treatment is recommended for the treatment of simple elbow dislocation: this is more effective, takes less time and is more economical.

Adult↗
PubMed1992

[Tarsal tunnel syndrome in athletes].

Pain in the hindfoot due to overuse has many causes. One uncommon cause is the entrapment of the posterior tibial nerve: the tarsal tunnel syndrome. Pain when palpating posterior the medial malleolus and pain in the abductor hallucis muscle are typical symptoms. Application of a local anaesthetic leads to immediate pain relief. The distal motoric latency is prolonged, but not in all cases. First of all, treatment consists of local and oral antiphlogistics, orthopaedic arch-support and physiotherapy. In case of therapy-resistant pain over more than three months period, surgical decompression of the tibial nerve should be performed. In the last three years we treated 18 patients with a tarsal tunnel syndrome: 6 of 8 patients were symptom-free after surgical intervention, whereas only 3 of 10 were symptom-free after conservative treatment.

Adult↗
PubMed1992

[Lung embolisms in a surgical patient sample. A retrospective study over 9 years].

In a retrospective study of surgical patients during a period of 9 years 296 cases of pulmonary embolism were recorded by analysing autopsy findings and perfusion pulmonary scans. The frequency of pulmonary embolism among patients who underwent a surgical procedure was 0.55%, the frequency of lethal pulmonary embolism was 0.15%. In autopsy disseminated micro-pulmonary embolism were often found (n = 129, 44%). With regard on the preceding operation a high frequency of pulmonary embolism after septic abdominal surgery (1.5%) and vascular surgery (0.9%) became obvious, especially after operations on the abdominal or thoracic aorta (2.1 resp. 4.8%). In 198 cases venous thrombosis were found. 104 (52%) of these were located in the cranial venous system and in 46 patients there was a connection to the site of central venous lines.

Adult↗
PubMed1991

Differential patterns of PMN-elastase and type III procollagen peptide in knee joint effusions due to acute and chronic sports injuries.

In 38 traumatic knee joint effusions the proteolytic enzyme PMN-elastase (PMN-E) and the repair marker procollagen III aminoterminal peptide (PIIINP) were determined. According to the period between trauma and first aspiration of the effusion, the patients were divided into 3 groups. Group I (17 patients; period between trauma and first aspiration not longer than 72 hours) showed high concentrations of PMN-E (up to 5400 ng/ml) and low concentrations of PIIINP (less than 13 U/ml). Group II (11 patients; aspiration within 4 to 14 days) had mean PMN-E and PIIINP concentrations of 125.6 ng/ml and 52.1 U/ml, respectively. In group III (10 patients, aspiration after 14 days) mean PMN-E concentration was 123.8 ng/ml and mean PIIINP concentration was 63.4 U/ml. Graphic depiction of PMN-E and PIIINP levels in each individual sample as a function of time between trauma and fluid collection revealed highly increasing PMN-E levels during the first 24 posttraumatic hours, followed by rapidly decreasing levels within 72 hours post trauma, and no change after the 4th posttraumatic day. In contrast, PIIINP increased continuously up to the first posttraumatic week and stayed at high levels up to 90 days (end of the observation period). The differential patterns of PMN-E and PIIINP concentration in knee joint effusions may be useful in estimating the period between trauma and first treatment (aspiration of effusion) and should, therefore, be helpful in detecting degenerative lesions, which seem to be characterized by low PMN-E concomitantly with high PIIINP levels.

Adolescent↗
PubMed1991

[Value of synthetic (Kennedy-LAD) augmentation in replacement of the anterior cruciate ligament].

In chronically ACL-deficient knees, ACL replacement was performed in 31 cases with an one-third patellar tendon (Brückner-Jones) and in 50 cases with a quadriceps-patellarperiosteum-patellar tendon autograft (Marshall-MacIntosh) augmented with the Kennedy LAD. Anterior laxity measured with the KT 1000 arthrometer revealed a side-to-side difference of less than or equal to 3 mm in 90% (77% without augmentation), a high rate of muscle strength quotient of uninjured to treated knee of about 1 (greater than 1 without augmentation) and early recovery of ability to participate in the same sports as before in 54% of patients (45% without augmentation) demonstrate statistically significant better results of ACL replacement when a synthetically augmented autograft was used.

Adolescent↗
PubMed1990

[Therapy-resistant heel pain--an indication for surgery in sports traumatology].

Posterior heel pain can be caused by inflammation or pathology of the achilles tendon, the tendon sheath, the retrocalcaneal and subcutaneous tendoachilles bursa, can be caused by osteophytes or stress fracture of the os calcis and by rheumatoid or metabolic diseases. The majority of patients can be treated successful nonoperatively; however, there is a small group of patients who are refractory to nonoperative managements. In the years 1984 to 422 patients with posterior heel pain were treated conservatively, 26 of these patients were refractory to that management. There were 9 cases of achilles tendinitis and/or tenosynovitis, 7 cases of bursitis, 3 cases of osteophyte of the os calcis. In 7 cases there was seen a combination of these three diseases. The following operative procedures were performed: discision of the tendon sheath, excision of thickened parts by inflammation, excision of degenerative and necrotic pain-producing areas in the achilles tendon, excision of bursa and ostectomy of osteophyte at the posterior-superior angle of the os calcis. The mean follow-up was 2.7 years (range, 1/2 to 5 years). Overall there were 79% good results. In our opinion cases of posterior heel pain refractory to non-operative treatment are an indication of sports surgery, especially in patients who like to continue sports without pain.

Achilles Tendon↗
PubMed1990

[Long-term follow up of anterior cruciate ligament reconstruction using autologous tendon graft augmented with alloplasty (Kennedy LAD)].

From October 1983 to January 1990 in 493 patients 499 injured anterior cruciate ligaments were reconstructed by a composite tendon graft. The autogenous graft, semitendinosus tendon or quadriceps-patella periost-patellar tendon, both anatomically attached distally, was augmented with the polypropylene braid (Kennedy LAD). In the period of January to November 1984 in 81 patients anterior cruciate ligament replacement was performed. A retrospective 2-years follow-up in 72 patients and a second 5-years follow-up in 67 of those 72 patients was possible. There were 38 patients with an acute rupture and 34 patients with chronic instability. Clinical and instrumented laxity revealed a mean displacement difference of not more than 3 mm in 84% of the patients in comparison of the involved with the normal knee at the 2-years and 5-years follow-up. 80% of strength analyses showed a physiological balance of quadriceps and hamstrings in the 5-years follow-up. In the 2-years follow-up only 41% of patients practiced former sports activities again, whereas in the 5-years follow-up 80% of the patients were able to join former sports. 80 to 100 points of Lysholm score demonstrating good to very good results were reached in 91% of the patients. Especially cartilage damages in cases of chronic instabilities worsened the results mentioned by the patients.

Adult↗
PubMed1990

[Mobilization in anesthesia and arthrolysis in postoperative knee joint stiffness].

Knee joint stiffness first of all calls for physiotherapy, ranging from exercise therapy to a passive-immobilization splint. If no progress can be achieved, narcosis mobilization and brisement modéré should be done. If narcosis mobilization does not yield acceptable results, then surgical dissolution and arthrolysis should be performed. Thirty-seven patients with painless fibrous knee-joint stiffness following ligament reconstructions showed a reduction in mobility of 0 degree-20 degrees-80 degrees on average. After narcosis mobilization, full extension and bending could be achieved in 28 patients. In 9 patients, arthrolysis had to be carried out. At follow-up examination 1/2 to 3 1/2 years later, all 37 patients showed an increase in movement of 0 degree-0 degree-125 degrees on average. The "relative gain," the quotient of achieved and possible gain of movement in percentage, ranged from 88% to 96% on average. Other kind of loss of movement, patient age, or sex had no influence on the results. Twenty-six patients were able to participate in sports again due to the increase in movement potential. In the last few years, we have come to prefer arthroscopical arthrolysis instead of surgical arthrolysis when narcosis mobilization fails.

Adult↗
PubMed1990

[Allogeneic skin transplantation in chronic graft-versus-host disease following bone marrow transplantation].

A 20-year old patient with acute myelogenous leukemia was transplanted with allogeneic bone marrow transplantation from his HLA-identical brother. Chronic graft-versus-host disease with ulcerous skin lesions developed at both lower legs. The lesions were extensive and conservative therapy was unsuccessful. Therefore, allogeneic skin transplantation from the marrow donor was performed. At present, four years later, these skin grafts are still vital.

Adult↗
PubMed1988

[Presacral tumor with sacral meningocele].

Due to rectal atresia a 10-year-old boy had been operated on using Rehbein's procedure in babyhood in another hospital. Rectal incontinence remained and we planned to improve it by a gracilis plastic operation. During preoperative diagnosis we found a so-called "Currarino triad", because the boy did not only have an anorectal malformation but also an anterior sacral meningocele and a solid presacral tumour. Initially, two surgical interventions were done to remove the tumour and meningocele and three months later a gracilis plastic operation was performed successfully.

Child↗
PubMed1988

[Aneurysm of the arteria lusoria. Case report and review of the literature].

Aneurysms arising from an aberrant subclavian artery represent a seldom but dangerous condition, which can be treated successfully when appropriately diagnosed. From 37 patients described in the literature most presented a mediastinal mass and had symptoms like dysphagia, dyspnoe or chest pain. Diagnosis is today possible by contrast-enhanced computed tomography. The aneurysm should be resected to prevent lethal rupture. Left thoracotomy seems to be the appropriate approach in most cases. Reestablishment of blood flow to the right subclavian artery seems not necessary and may be done if ischemia develops in a second procedure by subclavian transposition to the common carotid artery. The case of a 74-year-old women who had resection of an aneurysm in an aberrant subclavian artery is described together with a review of the literature and discussion of the surgical management.

Aged↗