Summary
A series of 100 total condylar knee arthroplasties was studied to determine radiographic and clinical patellofemoral function. Before operation there was lateral patellar tilt in 31 cases and lateral displacement in 52. After operation tilt was present in 8 and displacement in 14. Only a few patients had medial patellar displacement. Dislocation or fracture of the patella was not encountered. Six patients had postoperative patellar pain. In one case there was a radiolucent zone at the bone-cement interface in the patella, without pain. Patellofemoral function before operation was good in 3, fair in 54, and poor in 43 cases. After operation it was good in 88 and fair in 12. Both tilt and displacement slightly reduced postoperative patellofemoral function. Patellar reconstruction with the total condylar prothesis shows reasonably good tolerance of moderate malpositioning of the patellar prosthesis, affords sufficient stability and usually painless patellofemoral function.
Résumé
Les auteurs ont étudié une série de 100 arthroplasties du genou de type »total condylar« afin d'apprécier cliniquement et radiologiquement la fonction fémoro-patellaire. Avant l'opération il existait une bascule externe de la rotule dans 31 cas et une subluxation externe dans 52. Après l'opération, la bascule a été retrouvée 8 fois et la subluxation 14 fois. Quelques malades seulement présentaient une subluxation interne. Il n'y avait ni luxation ni fracture de la rotule. Six opérés se plaignaient de douleurs rotuliennes. Dans un cas on notait sur la radiographie une zone claire entre l'os et le ciment, mais sans douleur. La fonction fémoro-patellaire avant l'opération était bonne dans 3 cas, passable dans 54 et mauvaise dans 43. Après l'opération, elle était bonne 88 fois et passable 12 fois. Aussi bien la bascule que la subluxation réduisent un peu la fonction post-opératoire de l'articulation fémoropatellaire. La reconstruction de la rotule lors de l'arthroplastie »total condylar« tolère une légère malposition de la prothèse rotulienne, assure une stabilité suffisante et, habituellement, une fonction indolore.
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Sneppen, O., Gudmundsson, G.H. & Bünger, C. Patellofemoral function in total condylar knee arthroplasty. International Orthopaedics 9, 65–68 (1985). https://doi.org/10.1007/BF00267040
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DOI: https://doi.org/10.1007/BF00267040