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A patellar dislocation is a knee injury in which the patella (kneecap) slips out of its normal position. [5] Often the knee is partly bent, painful and swollen. [1] [2] The patella is also often felt and seen out of place. [1] Complications may include a patella fracture or arthritis. [3]
It typically results from a hard blow to the front of the knee or falling on the knee. [1] The patella can also be fractured indirectly. For example, a sudden contraction of the quadriceps muscle in the knee can pull apart the patella. [1] Diagnosis is based on symptoms and confirmed with X-rays. [3] In children an MRI may be required. [3]
The upper part of the patellar tendon attaches on the lower part of the knee cap, and the lower part of the patella tendon attaches to the tibial tubercle on the front of the tibia. Above the knee cap, the quadriceps muscle via the quadriceps tendon attaches to the top of the knee cap. This structure allows the knee to flex and extend, allowing ...
A knee dislocation is an injury in which there is disruption of the knee joint between the tibia and the femur. [ 3 ] [ 4 ] Symptoms include pain and instability of the knee. [ 2 ] Complications may include injury to an artery , most commonly the popliteal artery behind the knee , or compartment syndrome .
The incidence rate of initial patellar dislocations is roughly 32.8 per 100,000 person years. [39] Nearly 41% of knee dislocations have an associated fracture, with the majority of these fractures in one of the legs. [46] Nerve injury occurs in about 15.3% of knee dislocations, while major artery injury occurs in 7.8% of knee dislocations. [46]
Beyond 30 degrees, the quadriceps tendon and patellar ligament pull the patella posterior into the groove of the knee joint making lateral dislocation of the patella unlikely. Dislocation recurs in about 15–44% of cases, [4] and symptoms continue in about half. Recurrence of a laterally displaced patella is more common as the incidence of ...
822 Fracture of patella; 823 Fracture of tibia and fibula; 824 Fracture of ankle; 825 Fracture of one or more tarsal and metatarsal bones; 826 Fracture of one or more phalanges of foot; 827 Other, multiple, and ill-defined fractures of lower limb; 828 Multiple fractures involving both lower limbs, lower with upper limb, and lower limb(s) with ...
The most common injury to the lateral femoral condyle is an osteochondral fracture combined with a patellar dislocation. [1] The osteochondral fracture occurs on the weight-bearing portion of the lateral condyle. Typically, the condyle will fracture (and the patella may dislocate) as a result of severe impaction from activities such as downhill ...