PMC5974668_01
Pre-operative anteroposterior, lateral, and pat merchant X-ray views of the right knee show absent patella and medial compartment narrowing with mild ell varus deformity and joint line osteophytes.
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F1
The right knee radiographs, including anteroposterior, lateral, merchant, and posteroanterior views, revealed an absent patella, medial compartment narrowing with mild, correctible varus deformity of approximately 5  and medial joint line osteophytes (Fig. 1).
Pre-operative sagittal and axial magnetic resonance imaging cuts of the right knee show exposed bone over the weight-bearing medial femoral condyle and absent patella.
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F2
Finally, the patellar tendon was laterally subluxed over the anterolateral trochlear margin on extension views (Fig. 2).
Post-operative anteroposterior and lateral X- ray views of the right knee show excellent component alignment with recreation of the medial joint space.
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F3
Varus deformity was corrected to 1 degree of residual varus (Fig. 3).