TKA using the subvastus approach and lateral retinacular release in patients with permanent post-traumatic patellar dislocation: a report of two cases

Abstract

Permanent post-traumatic patellar dislocation is a rare condition, and total knee arthroplasty (TKA) can be performed for osteoarthritic knees with this condition. There have been only a few reports about using the standard medial parapatellar approach and extensive lateral release or extensor mechanism realignment for patients with permanent post-traumatic patellar dislocation. We performed two TKAs with using a subvastus approach and lateral release for osteoarthritic knees with permanent post-traumatic patellar dislocation. The patients were well satisfied with their results. The patellae tracked very well in the femoral trochlear groove throughout the full range of motion after the operations. Bone scans were done 1 year postoperatively on both patients, and the scans showed normal vascularity for the patella.

Total knee arthroplasty in a pseudoachondroplastic dwarfism patient with bilateral patellar dislocation

“…Similar cases are reported in the literature [2][3][4][5][6][7][8][9][10][11], but most reports are combined with proximal realignment procedures and to the author's knowledge, this is the first to report treatment in a pseudoachondroplastic dwarfism patient.…”

“…Gonarthrosis with patella dislocation is a rare pathology and there are few accounts of TKA associated with this condition [2][3][4][5][6][7][8][9][10][11]. Marmor was the first to report TKA in an adult patient with congenital dislocation of the patella [7].…”

“…Furthermore, total knee arthroplasty (TKA) is a rare choice of treatment in such a patient. A limited number of similar cases are reported in the literature [2][3][4][5][6][7][8][9][10][11][12]. It is still in debate whether a chronically dislocated extensor mechanism should be realigned during knee replacement [12].…”

İhmal Edilmiş Patella Dislokasyonunda Uygulanan Total Diz Protezi

“…Literatürde travma sonrası ihmal edilmiş ve kronikleşmiş patella dislokasyonu ile ilgili çok az sayıda makale yer almaktadır (10)(11)(12). Hastamızın anamnezinde travma öyküsü olmasının yanı sıra patellanın diğer patella ile aynı büyüklükte olması, hastanın diğer eklemlerinde laksite olmaması ve aile öyküsünün olmaması patolojinin sonradan gerçekleştiğini desteklemektedir.…”

“…Young in ve ark. 2009'da travma sonrası ihmal edilmiş patella dislokasyonu ve osteoartriti mevcut olan iki hastaya uyguladıkları total diz protezi ile başarılı sonuçlarını yayınlamışlardır (12 (20). Bu nedenle zorlayıcı fleksiyonda pateller tendon rüptürü gelişebilmektedir.…”