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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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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
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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
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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Patellar instability is an important cause of knee disability in children and adolescents. A recent population-based study found an annual incidence rate of 2.58 per 100 000 individuals for lateral patella dislocations (LPD), with higher rates in
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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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Exponent, Philadelphia, Pennsylvania, USA
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patients are more likely to have complications such as subluxation, dislocation, and chronic pain. 55 Traditionally, medialization of the patellar prosthesis has been recommended. 56 , 57 Using this technique, the patellar component is placed medial to
Università degli Studi di Pavia, Pavia, Lombardy, Italy
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rotation in of 7° to 17° with patellar dislocation. Another point of discussion is the infection rate that seems not to be influenced by the resurfacing of the patella, 40 as shown by a previous systematic review. These findings demonstrate that the
Ortoklinik & Cankaya Orthopedics, Ankara, Turkey
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Avcilar Hospital, Istanbul, Turkey
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Ortoklinik & Cankaya Orthopedics, Ankara, Turkey
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eccentric contraction of the quadriceps muscle. The risk factors associated with native patellar tendon injuries are also associated with an increased risk of tendon ruptures in patients with TKA ( 52 ). Dislocation of the polyethylene insert in either fixed
Department of Orthopaedic Surgery, University of Cape Town, SA
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-prosthesis dislocation. 29 , 35 , 36 Dome-shaped patellar components (e.g. AGC, Biomet, Warsaw, USA) can be forgiving in the appropriately conforming femoral component. 13 However, they have a propensity for increased contact stress and subsequent wear in
