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Biomedical subjects

N F Friederich

Publications and source records attributed to N F Friederich.

At least 19 recordsLinked to original sources
PubMed1999

Tibial and pretibial cyst formation after anterior cruciate ligament reconstruction with bioabsorbable interference screw fixation.

We report a case of an osteolytic tibial enlargement in association with a pretibial cyst formation 8 months after successful anterior cruciate ligament reconstruction with autologous bone-patellar tendon-bone graft and tibial graft fixation with a bioabsorbable interference screw. No joint inflammatory reaction or graft insufficiency was detected. The patient underwent cyst excision and curettage of the tibial tunnel with full recovery and return to preinjury level of activity 2 months after the revision surgery. To our knowledge, the reported complication is the first obvious adverse reaction to a poly-D,L-lactide interference screw in anterior cruciate ligament surgery.

Absorbable Implants↗
PubMed1998

[Pedestrian accidents].

The epidemiology of non-traffic-related, pedestrian injuries in the winter sports resort of Arosa (Switzerland) between 1968 and 1995 (beginning december to end april) was studied. A total of 2813 patients (1140 male and 1673 female patients) with 3010 injuries was surveyed in a general practice. The study showed in the examined period not only an increasing number of injuries and a culmination in February, but also a higher risk for females (60 versus 40 per cent) and an increasing incidence with age. 6% of all patients had more than one injury and 5% required hospitalization. Most pedestrians had injuries of the upper and lower extremity; fracture of the distal radius was the most often diagnosed injury, followed by distortions of the foot and wrist and fractures of the ankle. For accident prevention it is important, that the authorities do not abstain from mechanical cleaning of walking surfaces as soon as they become slippery and from giving out warnings via the mass media. For outdoor walking we postulate boots for ankle protection. The results are discussed and compared with already existing publications.

Accidents, Traffic↗
PubMed1998

Anterior cruciate ligament graft tensioning versus knee stability.

Positioning of the graft for anterior cruciate ligament (ACL) reconstruction and securing the graft at various degrees of knee flexion are interrelated factors when attempting to restore a knee's normal kinematics. The interrelationships between graft positioning on the femur and tibia (graft 'isometricity'); securing the graft at various positions of knee flexion; and the resulting restoration or disruption of the knee kinematics were studied on ten fresh frozen cadaveric knee specimens. Well placed ('isometric') grafts appeared to restore almost normal knee kinematics regardless of the position of the knee at the time of securing the grafts. This was, however, not the case in non-ideally placed grafts. 'Nonisometric' ACL substitutes which became taut in extension, overconstrained the knee if the graft was secured in flexion. If the same graft was secured in extension, increased joint laxity in flexion occurred. In contrast, 'nonisometric' ACL substitutes which became taut in flexion overconstrained the knee if the graft was secured in extension. If the same graft was secured in flexion, the graft became slack during extension.

Anterior Cruciate Ligament↗
PubMed1998

Lengthening osteotomy of the fibula for post-traumatic malunion. Indications, technique and results.

Relative shortening of the fibula may occur after any type of ankle fracture when the lateral malleolus is involved. Patients complain of pain and restriction of their daily and sporting activities. Clinically, there is valgus of the hind foot due to abduction and lateral rotation of the talus. The goal of treatment is to restore the initial length of the fibula by a horizontal or Z-osteotomy, which will also correct the malposition of the talus. This study shows that the operative reconstruction of a widened mortise is a relatively safe procedure, independent of the type of osteotomy used. Lengthening of the fibula is an important step in the treatment of the painful ankle when the fibula is short after trauma, even when degenerative changes of the joint are already present.

Adult↗
PubMed1998

Discoid lateral meniscus in children. Long-term follow-up after total meniscectomy.

We retrospectively reviewed the long-term results of total meniscectomy performed in seventeen knees (fourteen children) to treat a discoid lateral meniscus. The mean duration of follow-up was 19.8 years (range, 12.5 to 26.0 years). On the basis of the rating system of the International Knee Documentation Committee, seven knees were normal (grade A), six were nearly normal (grade B), three were abnormal (grade C), and one was severely abnormal (grade D) at the latest follow-up evaluation. Ten of the seventeen knees had clinical symptoms of osteoarthrosis. Radiographs were available for fifteen of the knees at the latest follow-up evaluation. Eleven of the treated knees could be compared with the uninvolved, contralateral knee. Ten knees had osteoarthrotic changes, such as flattening of the lateral femoral condyle, formation of a ridge along the lateral femoral condyle, and spurring and sclerosis of the tibial plateau. Osteochondritis dissecans developed in two knees, nine and twenty years after the initial meniscectomy.

Adolescent↗
PubMed1998

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Arthroplasty, Replacement, Hip↗
PubMed1998

[Patellar substitution in total knee prosthesis--is it important?].

As shown in long term follow-up studies of Total Knee Arthroplasty (TKA), the femoropatellar joint is an important problem. We report our experience over the past seven years not having resurfaced the patella at the primary TKA at all. Between 1990 and 1997 more than 700 consecutive TKA with the De Puy New Jersey LCS prosthesis were performed. A standardised lateral approach with osteotomy of the tibial tuberosity was used. The patella was redressed, either denervated or left untouched. In no case a primary patellar resurfacing was performed. X-rays of the patello-femoral joint showed a remodelling of the patella over the years, nicely matching the condylar design of the femoral prosthesis. Using a blood-supply-preserving approach and a biomechanically adequate implant, TKA without patellar replacement gives excellent long-term results.

Arthroplasty, Replacement, Knee↗
PubMed1997

[Injury of the dens axis in early childhood. Clinical case report and discussion].

Because of the special features of the subdental synchondrosis, fractures of the odontoid process in childhood can be seen as a separate entity. The subdental synchondrosis must be regarded as sort of an intervertebral disc and not as a growth plate. Among the generally rare fractures of the cervical spine in children this type ist the most common. Usually conservative treatment with a cast-fixation like the halo fixateur or the minerva jacket leads to consolidation. We report on the case of a 2-year-old girl with a fracture of the odontoid process who developed a unilateral syndrome hours after the accident. The treatment was conservative with a halo-like cast fixation. Nine weeks after the fixation bony consolidation was achieved and the cast could be removed. In the first days after fixation full neurological recovery had occurred. In early childhood (till the 7th year of life) according to the literature, patterns of neurologic dysfunction are incomplete injuries of the spinal cord and have the potential for recovery [4, 5, 7, 9, 10, 12].

Child, Preschool↗
PubMed1997

[Coincidence of bone infarct and aggressive bone metastasis].

A 42-year-old male patient presented with a history of persistent pain in the right femur without trauma of 2 months, duration and an episode of bloody stools 3 months earlier with no clinical findings upon examination. X-rays and CT scan revealed a circumscribed lesion with sclerosis and periostal reaction in the right proximal femur. A three-phase bone scan showed a massive hot spot in this area. Primarily differential diagnoses included a Brodie's abscess and/or a tumor. An excisional biopsy of the area was performed and revealed the coexistence of a bone infraction and the metastasis of an adenocarcinoma of unknown origin. The lesion in the bone was resected, filled with autogenous cancellous bone and stabilized with a plate. Further intensive screening with CT of the abdomen, gastroscopy and colonoscopy led to the primary tumor, an adenocarcinoma at the rectosigmoidal junction. No other metastases were detected. This patient presented with severe pain an radiologically divergent findings: a presumably benign process on radiography, but a massive hot spot on scintigraphy. Further procedures such as a CT scan and/or MRI had to be undertaken. If the analysis includes the differential diagnosis of a malignant process, a biopsy must be obtained, and if this reveals a metastasis, the primary tumor must be sought.

Adenocarcinoma↗
PubMed1996

[Shoulder problems in leisure athletes: physical examination, diagnosis and therapy. Sensible procedures in daily practice].

At first sight the anatomy of the shoulder may seem simple (see Fig. 1). However, for the physician treating a patient suffering from shoulder pain, the scapulo-thoracal interplay of 5 joints and 19 muscles, providing a wide and varied range of motion, may constitute an obstacle difficult to overcome. In the leisure athlete acute injuries must be distinguished from degenerative disease. Contact sports in particular tend to involve risks of falling on the shoulder, injuring the shoulder girdle or the elbow and wrist, sometimes with major consequences: complex fractures, dislocations, ligament and tendon lesions or joint instabilities. Thorough, rapid and cost-effective diagnostic evaluation of the athlete, involving clinical examination (function tests), radiographic imaging (shoulder a.p., y-view) and in selected cases ultrasonography (compared with the other side) may be necessary in starting early and effective therapy.

Acromioclavicular Joint↗
PubMed1996

Recurrent acute hemarthrosis after anterior cruciate ligament reconstruction. Report of an unusual complication and a review of the literature.

Arthroscopic-assisted and endoscopic operative techniques have allowed for less and less restrictive postoperative rehabilitation programs after cruciate ligament reconstruction. Accelerated rehabilitation programs may, however, also provoke mechanical problems at the transplant-bone interface, as reports in the literature of loosened fixation devices and loosened or even fractured bone pegs with subsequent hemarthrosis and recurrent instability have shown. We describe the case of a patient who presented with recurrent acute hemarthrosis after anterior cruciate ligament reconstruction without additional trauma and without instability. However, the symptoms and signs were clearly related to the fixation method employed.

Adult↗
PubMed1996

Deep posterior knee pain caused by a ganglion of the popliteus tendon--a case report.

The most common causes of posterior and posterolateral knee pain (besides referred pain) are knee joint effusions, tendinitis of the hamstring tendons, Baker cyst (semi-membranous cyst), bursitis, meniscal pathologies such as tears and ganglions and lesions of the anterior cruciate ligament. Less common causes include popliteus and gastrocnemius tendinitis, arthrofibrosis after trauma, posterior cruciate ligament sprains, deep venous thrombosis and/or irritations of the common peroneal nerve. We present one patient with posterolateral knee pain after a minor contusion. Magnetic resonance imaging revealed a degenerated posterior horn of the lateral meniscus and a somewhat unclear polypoid structure in the intercondylar region. As the posterior component of the pain persisted even after an arthroscopic partial meniscectomy, an operative revision was performed. A small ganglion of the sheath of the popliteus tendon was found and excised. The patient was immediately relieved of his pain after this procedure. To our knowledge this is the first report concerning a ganglion of the sheath of the popliteus tendon causing posterior knee pain. A similar pathology of the popliteus tendon has been described earlier but at a different localisation (in the hiatus), simulating a parameniscal cyst.

Adult↗
PubMed1996

[Knee joint ligament reconstruction--indications, results].

Cruciate ligament injuries have increased in number in the last 10 to 20 years. Nonoperative treatment of ligament injuries about the knee joint has lost some of its popularity; however, there are only very few randomized prospective studies demonstrating that operative reconstructions of knee ligament injuries do have a positive effect on preventing late osteoarthritic changes. In contrast, one of the best studies recently published shows that there may even be some increased rate of osteoarthritis in reconstructed patients. Why this? The concept of the 'Envelope of Load Acceptance' may explain, why some of the patients who opt for a nonoperative treatment of cruciate ligament injuries do very well. They lower the load and frequency to the knee joint and diminish their activity level. Patients with successfully treated ligament lesions about the knee joint may wish to go back to their preinjury level and may want to reach their preinjury 'shell' of load acceptance [Scott Dye, 1995]; however, this may already be too much for their knees [physiological overload] and may eventually lead to the osteoarthritic changes about the knee joint. Careful consultation of each individual patient's case of knee ligament injuries is essential for the successful treatment, a treatment which may reduce the rate of osteoarthritis and reduce costs for the injured and the community.

Anterior Cruciate Ligament↗
PubMed1993

[Gonarthrosis after injury of the anterior cruciate ligament: a multicenter, long-term study].

UNLABELLED: In order to estimate incidence, severity and associated factors in the development of the degenerative arthritis of the knee following a cruciate ligament injury, a multicenter, longterm follow-up study was undertaken. The time interval between injury and follow-up exam was a minimum of 15 years (range 15-52 years). Extensive physical examination and radiographic analyses from four "Knee Centers" (Hospital for Special Surgery, New York; Orthopädische Klinik, Bruderholz; Orthopaedic and Arthritic Hospital, Toronto; Orthopaedic Department Wichita, Kansas) on 328 patients revealed that the best correlation to the degree of osteoarthritis could be found to the time of meniscectomy. All other operations (suture of cruciate ligament, intraarticular or extraarticular reconstruction) showed much less correlation to the severity of the degenerative arthritis found at the follow-up exam. IN CONCLUSION: Preservation of as much meniscus tissue as possible at the time of injury seems to be the best warranty for slowing down degenerative arthritis after cruciate ligament injury.

Adult↗
PubMed1993

Role of extra-articular procedure.

This article describes the 1993 role of extra-articular procedures in the treatment of anterior cruciate-deficient knees. Twenty years ago, most operative effort was concentrated on elimination of the pivot shift phenomenon. Newer operative reconstructions made most of the advantages attributed to extraarticular procedures (shorter operating room time, less soft tissue injury, shorter postoperative rehabilitation) no longer true.

Anterior Cruciate Ligament↗