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mechanism rupture. However, the major error to avoid is post-operative patellar maltracking. The debate still rages about how to avoid post-operative anterior knee pain. This review will mainly concentrate on avoiding maltracking. It begs the question
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included instability (11%), stiffness (6%), periprosthetic fracture (4%), infection (2%), aseptic loosening (1%) and extensor mechanism disruption (1%). Ten of 36 knees (28%) developed recurrent recurvatum post-operatively (five CRs, four CCKs and one RHK
Orthopaedic Department, University General Hospital of Larissa, Greece
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(transverse plane) of both components affects the extensor mechanism and range of motion. Since femoral component rotation is closely related to the medio-lateral gap in flexion, the concept of 3° of femoral component external rotation was introduced when
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Exponent, Philadelphia, Pennsylvania, USA
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extension, as well as to reduce friction between the extensor mechanism and the femur. 27 The articular surface area of the patella changes with joint position, with the contact surface on the patella becoming more proximal as the knee progresses through
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requires an incision through the quadriceps tendon, which may impair the extensor mechanism of the knee post-operatively. The subvastus approach was described by Erkes in 1929 2 and popularized by Hoffman in 1991. 3 It has the theoretical advantage of
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contralateral knee. Some surgeons prefer to harvest the graft from the uninjured contralateral knee to reduce further insult to the injured knee. Common allografts used in multiligament knee reconstruction include Achilles tendon, extensor mechanism apparatus
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bone reconstruction, with a PS liner to reduce stress at the bone-implant interface. Finally, in cases of severe bone loss, ligament incompetence or extensor mechanism disruption, we have to consider upgrading the constraint to a rotating hinge knee
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AO Foundation, PAEG Expert Group, Davos, Switzerland
Hospital Base de Valdivia, Valdivia, Chile
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Hospital Base de Valdivia, Valdivia, Chile
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Universidad del Desarrollo, Santiago, Chile
Hospital Clínico Mutual de Seguridad, Santiago, Chile
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reduction and fixation with cannulated screws (B-C) and repair of the detached periosteum sleeve. Treatment The objective of treatment is to restore the extensor mechanism of the knee, the joint surface and the meniscal anatomy when it is
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Casa di Cura Villa Betania, Rome, Italy
Marrelli Hospital, Crotone, Italy
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pathology excluding extensor mechanism . Semin Musculoskelet Radiol 2017 ; 21 : 102 – 112 . 22. Paczesny Ł Kruczyński J . Ultrasound of the knee . Semin Ultrasound CT MR 2011 ; 32 : 114 – 124 . 23. De
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. At this point the tibia can be externally rotated to gain exposure and to reduce tension on the extensor mechanism, and the patella can be subluxated laterally, avoiding any releasing of the patellar ligament. We generally do not evert the patella, as
