Granted Patent
B2
US 12,740,875 · App. 18/801,924 · Granted Sep 22, 2026
Leg length and offset tracking with expandable trial femoral assembly
Inventors:
Israel Oluwasakin (Dresher, PA); Edward McGettigan (Norristown, PA); Hayden Cameron (Philadelphia, PA)
Assignee:
Globus Medical, Inc.
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Abstract
Methods include tracking one or more of a leg length or an offset in a patient during a total hip arthroplasty (THA) procedure performed using a navigated surgical system, with an expandable trial femoral assembly. Certain methods include registering a pelvis of the patient to the navigated surgical system; and in various embodiments measuring a leg length or registering a femur to the navigated surgical system. An expandable trial femoral assembly is affixed to a prepared and broached femur of the patient; and the expandable trial femoral assembly is reduced into an acetabular prosthesis. A navigated driver may then be used to adjust an expansion extent of the expandable trial femoral assembly. The navigated surgical system may measure the leg length and the offset in the patient based on the movement of a reference element of the femur relative to a reference element of the pelvis.
Claims (20)
1 . A method of tracking one or both of a leg length or an offset in a patient during a total hip arthroplasty (THA) procedure, the method comprising:
registering a pelvis of the patient to a navigated surgical system;
measuring a native leg length of the patient using a navigated instrument;
affixing an expandable trial femoral assembly to a prepared and broached femur of the patient;
reducing the expandable trial femoral assembly into an acetabular prosthesis; and
using a navigated driver having a first reference element and a second reference element movable relative to the first reference element,
adjusting an expansion extent of the expandable trial femoral assembly; and
measuring one or both of the leg length or the offset in the patient based on a position of the first reference element relative to the second reference element as detected by the navigated surgical system.
2 . The method of claim 1 , wherein a distance moved by the second reference element relative to the first reference element is representative of one or both of the leg length or the offset of the patient.
3 . The method of claim 1 , wherein the first reference element is a tracking array affixed to the navigated driver, and the second reference element comprises a length indicator disposed on a movable mount.
4 . The method of claim 1 , wherein adjusting the expansion extent of the expandable trial femoral assembly further comprises:
actuating a knob of the navigated driver to expand or collapse the expandable trial femoral assembly.
5 . The method of claim 1 , further comprising:
affixing a dynamic reference base (DRB) to the pelvis of the patient; and
using the DRB to register the pelvis to the navigated surgical system.
6 . The method of claim 1 , wherein the navigated instrument comprises a stylus having a tracking array disposed thereon.
7 . The method of claim 1 , wherein the expandable trial femoral assembly comprises
a head;
a neck connected to the head; and
a stem or broach connected to the neck, wherein the neck is expandable and collapsible.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Aug 23, 2024
From: OLUWASAKIN, ISRAEL; MCGETTIGAN, EDWARD; CAMERON, HAYDEN
To: GLOBUS MEDICAL, INC.
Reel/Frame 068379/0985 →
Continuity (1)
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