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Introduction With an incidence of 5.8 per 100 000 per year, patellar dislocations are commonly seen in the emergency department. 1 Over the past two decades, several studies and reviews have been published on the subject of whether these
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morphology and injury. Several studies have analyzed the risk factors for recurrence after the first episode of patellar dislocation. Balcarek et al. have described a ‘Patellar Instability Severity Score’ where age, bilaterality, trochlear dysplasia
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primary patellar dislocation has been reported to be 5.8 cases per 100 000, and the rate is higher for younger and more active populations. 1 , 2 Patellar dislocation is a multifactorial problem, which depends on limb alignment, the osseous structure
Istituto Ortopedico Rizzoli, Laboratorio di Biomeccanica e Innovazione Tecnologica, Bologna (BO), Italy
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Istituto Ortopedico Rizzoli, Laboratorio di Biomeccanica e Innovazione Tecnologica, Bologna (BO), Italy
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Istituto Ortopedico Rizzoli, Laboratorio di Biomeccanica e Innovazione Tecnologica, Bologna (BO), Italy
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, such a situation is not present in breech presentation, especially in those cases with extended knees. A similar theory was suggested by Salzmann et al 8 which imputed the reason for patellar dislocation in a below-knee amputee patient, to be the
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–flexion–external rotation, occurs in more than 80% of primary patellar dislocations. Spontaneous patellar dislocation is common in skeletally immature girls, and locked dislocation is common in skeletally mature men. 4 Many patients report that they felt the patella
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necessary, it can be included in the surgical approach. Chronic patellar dislocation is always associated with a tight lateral retinaculum so there should be a low threshold to performing a lateral release, noting that a quadricepsplasty may also be needed
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may lead to ligament tears and cause subchondral contusions in the anterior tibia and femur, and those related to spontaneously-reduced lateral patellar dislocation in teenagers around the time of physeal closure. The latter is characterised by one or
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adductor tubercle and cut with a high-speed saw just beneath the adductor tubercle while preserving the vast adductor insertion. An angled femoral cut of 10–15° is performed from anterior-distal to posterior-proximal to prevent patellar dislocation
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without any complications. Tourniquet use was defined; however, this was not the primary outcome of these studies. These studies investigated complications following peripheral nerve blocks ( 69 ), surgical fixations for recurrent patellar dislocation ( 70
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porous metal, then a universal stem extractor can be used to remove the remaining implant. Fig. 2 Tibial component extraction. Extensile approaches Extensile approaches, other than a long medial parapatellar approach with patellar
