patellar dislocation

patellar dislocation

Orthopedics A subluxation, usually lateral, of the patella, due to a sudden change in direction while running and the knee is under stress; may follow injury, accompanied by pain and inability to walk. See GLC7.
References in periodicals archive ?
1-3) Atkin reported the risk of patellar dislocation to be 7 per 100,000; however, this number increases to 31 per 100,000 in persons in their second decade of life.
Lateral patellar dislocation with vertical axis rotation of 90[degrees].
Hypermobility (which is generally accepted risk factor for patellar dislocation and finally for instability), measurement of 0 angle and patellar tilt test were also applied.
Potential subjects were excluded if they were pregnant or a competitive athlete or had a disabling general illness, reported knee ligamentous or meniscal injury, previous knee surgery, a history of patellar dislocation, other knee problems, or physical therapy for PFPS in the previous 4 weeks.
Osteochondral fractures may result from a direct blow or patellar dislocation.
Examples of acute trauma leading to direct injury, to hypertrophy and impingement or to arthrofibrosus, are injury of the anterior cruciate ligament or patellar tendon, patellar dislocation and surgical procedures such as arthroscopy, anterior cruciate reconstruction and total knee arthroplasty (Apostolaki et al, 1999; Duri et al, 1996: Ellen et al, 1999; Kramers-de Quervain et al, 2004; Murakami et al, 1997; Saddick et al, 2004).
In addition, the patella is unstable when sutured to the posterior knee joint capsule, and this configuration may cause pain and be associated with patellar dislocation even for those patients who are nonambulatory.
21) In contrast to this conclusion, Fithian and colleagues argue that no amount of muscle force imbalance will cause patellar dislocation unless a coexisting patholaxity of the medial ligamentous restraints is present.
1,2) Addressing the specifics of anatomy, biomechanics, history, physical examination, and radiographic interpretation can shed important light on the treatment options of acute and recurrent patellar dislocation and subluxations.
Dr George John, Specialist Sports Medicine Surgeon and Managing Partner of International Modern Hospital, said that patellar dislocations occur with significant regularity, particularly in young female athletes.
Any history of recurrent patellar dislocations suggests the presence of patellofemoral misalignment or instability.