Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Jan 1990
Case ReportsIncomplete avulsion of the femoral attachment of the posterior cruciate ligament with an osteochondral fragment in a twelve-year-old boy.
Isolated avulsion of the posterior cruciate ligament from the femoral attachment of the knee as a hyperextension injury is rare. We saw a young child with an incomplete avulsion of the posterior cruciate ligament that occurred after a blow to the anterior tibial surface of a flexed knee; the child revealed a lack of knee extension due to a pinch of the osteochondral fragment connected to the anterior band of the posterior cruciate ligament in the knee joint. Arthroscopic extirpation of a fragment was undertaken.
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Arch Orthop Trauma Surg · Jan 1990
Methods and applications of three-dimensional imaging in orthopedics.
Computed tomography is a commonly used technique for detecting pathological alterations in soft tissues and the skeleton. Three-dimensional images of the skeleton are very useful for planning surgical treatment and monitoring therapy, but unfortunately mental reconstruction of complex three-dimensional anatomical structures from conventional tomography is very difficult. This article describes a process by which automated analysis of the regions of interest in the computed tomographic (CT) images yields the contours of the surfaces which can be presented pseudo-three-dimensionally using Phong's lighting model and Gouraud's shading methods. Three applications in the areas of orthopedics and neurosurgery demonstrate the efficacy of the method.
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Arch Orthop Trauma Surg · Jan 1990
Femoral shaft perforation at arthroplasty: to treat or not to treat.
Femoral shaft perforation at total hip arthroplasty is a complication that is being noted more frequently, and it is often associated with femoral shaft fracture below the prosthesis. This study examines the anatomic and biomechanical effects of femoral shaft perforation at arthroplasty, and the effects of supporting the perforated bone with Partridge plates and bands. ⋯ Testing the bone models to failure in tensile mode showed that the perforations weakened the bone and that the Partridge plates and bands decreased the weakening effects of the perforation. The strengthening effect of the Partridge plates and bands on the bone with a perforation, allied with the presence of an internal splint in the event of a fracture through the perforation, suggests the benefit of using Partridge plates and bands if a cortical perforation is found at arthroplasty and revision is not feasible.
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In patients with persistent localized pain at the level of a sesamoid bone of the thumb not obviously related to trauma, sesamoidectomy gives excellent results. Often no X-ray or histological abnormalities are found, leaving the origin of pain problems still unsolved.
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Arch Orthop Trauma Surg · Jan 1990
ReviewClinical experience with titanium implants, especially with the limited contact dynamic compression plate system.
AO/ASIF with its collaborating laboratories has developed cold worked pure titanium material for implants with an outstanding biocompatibility. The first prospectively controlled clinical series dates back to 1966 and was reported to be most successful. Pure titanium also became the material of choice for implants to be used in patients suffering from metal allergy. ⋯ Pilot clinics started to implant titanium LC-DCP in 1987, and already 271 plates have been used, mainly for the treatment of fresh fractures. Some 57 plates have so far been removed. The preliminary results are most favourable; they confirm especially the outstanding biocompatibility of pure titanium.