PMC2821390_01
Sagittal radiograph of the knee showing dislocated patellar prosthesis.
1752-1947-4-11-1.jpg
PMC2821390_01_1752-1947-4-11-1.jpg
F1
Radiographs taken in casualty showed that the prosthesis was dislodged and had displaced into the infrapatellar area (Figure 1).
Intraoperative picture showing dislocated patellar prosthesis in the patellar tendon.
1752-1947-4-11-2.jpg
PMC2821390_01_1752-1947-4-11-2.jpg
F2
Intraoperatively, the prosthesis was noted to have sheared off its fixation pegs and dislocated inferiorly, thus splitting the patellar tendon and forming a pocket in it (Figures 2, 3, 4).
Extracted patellar prosthesis with cavity in the patellar tendon.
1752-1947-4-11-3.jpg
PMC2821390_01_1752-1947-4-11-3.jpg
F3
Intraoperatively, the prosthesis was noted to have sheared off its fixation pegs and dislocated inferiorly, thus splitting the patellar tendon and forming a pocket in it (Figures 2, 3, 4).
Splitting of the patellar tendon due to dislocated patellar prosthesis.
1752-1947-4-11-4.jpg
PMC2821390_01_1752-1947-4-11-4.jpg
F4
Intraoperatively, the prosthesis was noted to have sheared off its fixation pegs and dislocated inferiorly, thus splitting the patellar tendon and forming a pocket in it (Figures 2, 3, 4).
Postoperative sagittal radiograph of the knee after revision of the patellar component.
1752-1947-4-11-5.jpg
PMC2821390_01_1752-1947-4-11-5.jpg
F5
The patella was cleaned and the patellar cut was revised to 16 mm and the cemented 38-mm prosthetis was reimplanted with a good patellofemoral tracking (Figure 5).