A computer-assisted surgery system comprises instruments adapted to be used to perform tasks related to surgery. A reference device is in a fixed relation to a bone. A rotating magnet creates a magnetic field plane, the rotating magnet being connected to one of the instrument and the reference device. A magnetometer on the other of the instrument and the reference device produces signals as a function of at least its orientation relative to the magnetic field plane. A processing unit tracks said orientation of the instrument relative to the bone using said signals from the magnetometer subjected to the magnetic field plane.

A prosthetic shoulder implant system includes a prosthetic humeral implant and a version device. The humeral implant includes a catch member aperture and a first locking pin aperture. The version device includes a rotatable member with a body and a flexure member, and a plate with a catch member and a projection contacting the flexure member. A first locking pin extends from the version device and is adapted to mate with the first locking pin aperture. In an unlocked condition of the system, the rotatable member has a first rotated position in which the flexure member is in an uncompressed state and the plate is in a first position, and in a locked condition of the system, the rotatable member has a second rotated position in which the flexure member is in a compressed state and the plate is in a second position proximal of the first position.

An orthopedic measurement system is disclosed to measure leg alignment. The measurement system includes a tri-axial gyroscope configured to measure movement of a leg. The gyroscope is coupled to a tibia of the leg. For example, the gyroscope can be placed in an insert or tibial prosthetic component that couples to the tibia. The gyroscope is used to measure alignment relative to the mechanical axis of the leg. The leg alignment measurement is performed by putting the leg through a first leg movement and a second leg movement. The gyroscope outputs angular velocities on the axes the sensor is rotated about. The gyroscope is coupled to a computer that calculates the alignment of the leg relative to the mechanical axis from the gyroscope measurement data.

Hip arthroplasty apparatus and methods are described to determine an orientation of an acetabular cup impactor, the acetabular cup impactor being moveable to a desired orientation relative to a patient's pelvic region for implantation of an acetabular cup. In one embodiment an electronic orientation sensor is transitionable between a first location on the patient's pelvic region and a second location on the acetabular cup impactor. At the first location, the orientation sensor is adapted to record a reference orientation of the patient's pelvic region. At the second location the orientation sensor is adapted to determine an orientation of the acetabular cup impactor relative to the reference orientation.

An apparatus and method for aligning an acetabular cup. The apparatus may include an acetabular cup (150, 10) and/or a protractor (30) and/or a depth gauge tool (90) and may be provided in the form of a surgical kit. Components of the apparatus may allow an angle of rotation of an acetabular cup about an axis (111) of the cup relative to an anatomical feature of a patient to be determined when the acetabular cup implant is placed in the acetabulum of the patient. Components of the apparatus may allow an amount of overhang between a rim (12, 162) of an acetabular cup and an edge of the acetabulum to be determined. The acetabular cup may be an acetabular trial cup (10) or and acetabular cup implant (150). Embodiments of the invention may allow both the angle of rotation about the cup axis and the amount of overhang between the rim and the acetabulum edge to be determined.

The present invention relates to a system and methods generally aimed at monitoring the angular orientation between two locations within a fluoroscopic image and especially for monitoring the angular orientation between two locations within a fluoroscopic image and a predetermined target angle.

Systems and methods are provided for planning placement of an acetabular implant for a patient based on pelvic tilt. The system includes one or more sensors to be placed on the patient to provide measurements of a pelvic tilt angle of the patient taken with the patient in various functional positions to produce patient-specific data based on pelvic tilt from which to plan an inclination angle and a version angle of the acetabular implant for the patient.

A joint balancing insert with sensors and an actuated mechanism is disclosed. The joint balancing insert is used to balance a joint during arthroplasty surgery, as the sensors provide force, position and angular data relating to the movement of the joint, while the actuated mechanism allows for highly accurate and dynamic adjustments of the joint based on the data from the sensors. Various configurations of actuated mechanisms and sensors may be implemented in the insert to provide for manual or real time control of the insert, and customized interfaces are provided for visualized feedback of adjustments. Sensor data may also be collected and compared with expected or preferred data sets to provide adjustment recommendations and achieve better outcomes based on historical data.

An apparatus, system, and method for determining a position of a hip prosthesis in a bone of a patient includes determining a set of contact points between a femoral head of a femoral prosthesis and a cup liner of an acetabular cup to be implanted into a patient based on a mechanics model. The mechanics model is indicative of mechanical motion of a hip exhibited during performance of a set of ADL or at corresponding functional positions of the patient. In some embodiments, a mathematical model may be generated based on a plurality of sets of contact points determined using the mechanics model and subsequently used to determine a resultant set of contact points.

A method of trialing an intervertebral disc space, comprising the steps of : a) creating the disc space, b) inserting a trial into the disc space, the trial having i) a distal head having an upper surface and a lower surface connected by a pair of side walls, the side walls defining planes, and ii) a proximal rod, wherein the head and rod form an obtuse angle, and wherein the rod extends through at least one of the planes defined by the side walls of the head.