Technical Brief

Automated Portal Placement for Arthroscopic Hip Surgery

[+] Author and Article Information
Emily Geist

Department of Mechanical Engineering,
Bucknell University,
One Dent Drive,
Lewisburg, PA 17837
e-mail: emily.geist@bucknell.edu

Manuscript received March 19, 2013; final manuscript received September 11, 2013; published online December 6, 2013. Assoc. Editor: Carl A. Nelson.

J. Med. Devices 8(1), 014506 (Dec 06, 2013) (4 pages) Paper No: MED-13-1124; doi: 10.1115/1.4025451 History: Received March 19, 2013; Revised September 11, 2013

Placing portal incisions during arthroscopic hip surgery presents challenges for surgeons in terms of anatomic accessibility and patient safety. Based on key anatomic landmarks and portal placement information from recent literature, suggested portal incisions were determined. Guidance in the placement of the three most common portal incision locations (anterior, anterolateral, and posterolateral) for arthroscopic surgery; in addition to visual feedback on tool trajectory to the hip joint is provided in real time by a computer aided system for hip arthroscopy. By simplifying the portal placement process, one of the most challenging aspects of arthroscopic hip surgery, an increased use of this minimally invasive technique could be possible. In addition to portal information, improvements to an existing computer aided system for arthroscopic hip surgery, including a new hip model and redesigned mechanical tracking linkage, were completed.

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Grahic Jump Location
Fig. 1

Updated femur and pelvis models created at Bucknell University

Grahic Jump Location
Fig. 2

Redesigned mechanical tracking linkage and associated computer model. (a) Redesigned tracking linkage with absolute magnetic encoders attached to hip model. (b) Computer model of hip anatomy and tracking linkage used in visual interface.

Grahic Jump Location
Fig. 3

A user marks key anatomic landmarks on a model of the hip and the computer generates their location on a virtual model. (a) Using the encoder tracking linkage, a user indicates the key anatomic landmarks on the hip joint model. (b) Top and side views of the key landmarks: ASIS and the tip of the greater trochanter.

Grahic Jump Location
Fig. 4

Side (a) and angled (b) views of hip joint model with marked greater trochanter in blue, and three computer generated portal locations. The anterior portal is shown in yellow, the anterolateral portal in green, and posterolateral portal in fuchsia.

Grahic Jump Location
Fig. 5

Two views of the hip joint model with generated trajectory from tool tip at portal incision to the hip joint. Portal locations are indicated as in Fig. 4.



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