PMC6332997_01
X-ray showing the fabella in a normal posterior location on the lateral X-ray.
CRIOR2018-2371947.001.jpg
PMC6332997_01_CRIOR2018-2371947.001.jpg
fig1
He was referred to orthopedics where X-rays of the knee were normal (Figures 1 and 2). The dynamic ultrasound showed a moderate-sized fabella in the posterior knee adjacent to the peroneal nerve, with a dynamic compression of the nerve on knee flexion and nerve enlargement distally (see Figure 3 and ultrasound videos 1 and 2).
Fabella located lateral out from behind the lateral femur on the AP X-ray.
CRIOR2018-2371947.002.jpg
PMC6332997_01_CRIOR2018-2371947.002.jpg
fig2
He was referred to orthopedics where X-rays of the knee were normal (Figures 1 and 2). The dynamic ultrasound showed a moderate-sized fabella in the posterior knee adjacent to the peroneal nerve, with a dynamic compression of the nerve on knee flexion and nerve enlargement distally (see Figure 3 and ultrasound videos 1 and 2).
Axial ultrasound of the posterior lateral knee (blue: femoral condyle, red: fabella causing acoustic shadowing, and gold: peroneal nerve).
CRIOR2018-2371947.003.jpg
PMC6332997_01_CRIOR2018-2371947.003.jpg
fig3
The dynamic ultrasound showed a moderate-sized fabella in the posterior knee adjacent to the peroneal nerve, with a dynamic compression of the nerve on knee flexion and nerve enlargement distally (see Figure 3 and ultrasound videos 1 and 2).
Preoperative marking of the fabella with the patient.
CRIOR2018-2371947.004.jpg
PMC6332997_01_CRIOR2018-2371947.004.jpg
fig4
Preoperatively, we were able to palpate and mark the fabella with the patient (Figure 4).
Exposure of the fabella.
CRIOR2018-2371947.005.jpg
PMC6332997_01_CRIOR2018-2371947.005.jpg
fig5
The lateral gastrocnemius tendon was incised longitudinally directly over the fabella (Figure 5).
Fabella was removed as a single unit and measured 13 mm x 10 mm.
CRIOR2018-2371947.006.jpg
PMC6332997_01_CRIOR2018-2371947.006.jpg
fig6
The fabella itself was then removed as a single unit and measured 13 mm in length by 10 mm in width (Figure 6).