PMC5974677_01
Pre-operative standing anteroposterior pelvic radiograph depicting left hip osteoarthritis and impingement, with the presence of osteophytosis, joint space narrowing, and subchondral cystic changes.
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F1
Plain film radiographs were obtained and revealed bilateral hip joint osteoarthritis, with osteophytosis, joint space narrowing, and subchondral cystic changes in the left hip (Fig. 1).
The Intellijoint Hip  3D mini-navigation tool. The camera (A), enclosed in a sterile drape, is attached to the pelvic platform (B) through two screws (C). The tracker (D) is magnetically attached to the femoral platform (E). The camera captures movements of the tracker and relays the information to a workstation for review by the surgeon.
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F2
In addition to the femoral platform, the tracker can be fixed to various other objects (e.g., impactor and surgical probe) during surgery to provide data regarding their position and orientation (Fig. 2).
(A) Post-operative standing anteroposterior pelvic radiograph depicting Birmingham Hip Resurfacing performed on the left hip. (B) TraumaCad overlay showing restoration of leg length differential to 0 mm, and cup position values of 39  inclination and 24  anteversion.
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F3
Final cup position was calculated from radiographs as 39.0  inclination and 24.7  anteversion (Fig. 3).