Disclosed is a cage for minimally invasive surgery, the cage including a main body part inserted into a space between a vertebra and an adjacent vertebra, and having lengthwise first and second end parts connected rotatably to each other, and a dilatation induction part provided in an inner space of the main body part, the dilatation induction part being configured to dilate a lengthwise middle part of the main body part by moving to a position at which the first and second end parts of the main body part are connected to each other.

A system includes a first implant component and a second implant component. The first implant component is configured to be secured to a bone and includes a plate and a coupler extending upward from the plate and defining a coupler axis. The second implant component is configured to be coupled to the first implant component. The second implant component includes an articulation surface and defines a cavity configured to receive the coupler of the first implant component. The second implant component is couplable to the first implant component at a plurality of rotational orientations about the coupler axis.

The femoral neck preserving hip implant includes a polymer femoral head molded onto a femoral head base, which is attached to a femoral neck rod to be inserted into the femoral neck of a patient. A metal acetabular cup is inserted into an acetabulum anatomy of a pelvis. The femoral head interfaces with the acetabular cup as a smooth plastic-to-metal spherical-surface joint. A main body shaft to be inserted into a femoral shaft has a diagonal hole therethrough located at a center line of the femur's neck to receive the femoral neck rod at a specified angle. A secured lock mechanism in the main body shaft above the diagonal hole is screwed down to compressively engage the femoral neck rod. Both the diagonal hole and the end of the femoral neck rod may have a slight taper. The femoral neck rod also has a radially outward extending flange that forms a contact feature that sits upon the resection plane of the femoral neck to stabilize against axial force loading.

A medical device for implantation in a knee joint of a human patient is provided. The medical device comprises: an inner surface and an outer surface. The inner surface comprises: a first point, a second point, a third point, a fourth point, a fifth point, and a sixth point, all points located on different places along a length axis of said inner surface. A first straight line, reaching from the first point to the second point is parallel to a second straight line reaching from the third point to the fourth point, which in turn is parallel to a third straight line reaching from the fifth point to the sixth point. The first and third straight lines are of equal length and the second straight line is longer than the first, furthermore the third straight line is positioned between the first and third straight lines. Wherein the medical device comprises a first articulating surface adapted replaced the surface of the contacting surface of the medial condyle, a second articulating surface adapted to replace the contacting surface of the lateral condyle and a third articulating surface adapted to replace the contacting surface of the patella.

An acetabular prosthesis for use in a hip arthroplasty surgical procedure is disclosed. The acetabular prosthesis includes an acetabular liner assembly to be secured to an acetabular shell component. The acetabular liner assembly includes a ceramic acetabular shell liner component. The acetabular liner assembly also includes a metal ring affixed to and encircling the ceramic acetabular shell liner component. The metal ring includes a proximal rim shaped to define a lead-in surface.

A prosthetic hip joint implant comprises an acetabular liner having an acetabular liner inner surface and defining an acetabular recess, and a femoral component comprising a head having a head outer surface and defining a head recess, a shaft having a shaft proximal end and a shaft distal end disposed within the head recess, and a covering disposed on and fixedly secured to the head outer surface, the shaft distal end, head, and covering disposed within the acetabular liner recess such that the covering is in continuous contact with the acetabular liner inner surface. Polyaxial movement of the shaft distal end produces movement of the covering along the acetabular liner inner surface within the acetabular liner recess without producing relative movement between the covering and the head.

A modular reverse shoulder prosthesis according to embodiments of the present invention includes a stem having a proximal taper and a primary stem axis, the proximal taper extending from the stem about a metaphyseal axis, the metaphyseal axis at an angle with respect to the primary stem axis, a metaphysis having a proximal end, a distal end, a first aperture in the distal end configured to be placed over the proximal taper, and a second aperture in the proximal end having an insert axis that is eccentrically offset from the metaphyseal axis, the metaphysis configured for attachment to the stem at any rotational position of the metaphysis about the metaphyseal axis, and a reverse insert, the reverse insert having a proximal end and a distal end, wherein the proximal end comprises a concave cup formed about a cup axis and configured to receive a glenosphere, and wherein the distal end comprises a locking protrusion, wherein the locking protrusion has an outer surface with a cross-sectional shape that is rotationally symmetrical about the insert axis with respect to a corresponding inner surface of the second aperture, wherein the rotational symmetry has an order of six, seven, eight, nine, or ten.

The present invention provides an intervertebral implant for implantation in a treated area of an intervertebral space between vertebral bodies of a spine. The implant includes a spacer portion having an inferior and superior surface, wherein the inferior and superior surfaces each have a contact area capable of engaging with anatomy in the treated area, and the inferior and superior surfaces define a through-hole extending through the spacer body. The present invention further provides holes extending from a side portion to the inferior and superior surfaces of the spacer portion and a plate portion rigidly coupled to the spacer portion, wherein the plate portion contains holes for receiving screws. A fastener back out prevention mechanism adapted on the plate to prevent the back out of the fasteners from the holes and to secure the spacer to the plate of the intervertebral implant.

An interspinous posterior device (IPD) is described. The IPD has a body and bone fixation elements on either side of the body, each of said bone fixation elements having a ratchet locking mechanism for fixing the body to successive spinous processes of a mammalian vertebra. Each of the bone fixation elements is independently adjustable by ratcheting it separately and independently of the other bone fixation elements. The body of the IPD has a dynamic configuration and a non-dynamic configuration, wherein the dynamic configuration allows for both extension and flexion of the successive spinous processes and the non-dynamic configuration prohibits extension of the successive spinous processes. The IPD also includes a removable extension restriction block, wherein the extension restriction block can optionally be inserted in the body to prohibit extension or can be removed from the body to allow extension.

A vertebral fixation plate system and a method for its use in a surgical procedure to fuse adjacent spinal vertebrae. A mounting member is attached to the vertebral fixation plate so that the fixation plate can move with respect to the mounting member through a range of available positions. The mounting member can be attached to a spinal interbody fusion device installed in place of a removed spinal disc, thus also loosely fastening the vertebral fixation plate to the fusion device. A fastener can tighten the vertebral fixation plate to the mounting member and establish a location of the vertebral fixation plate with respect to the vertebrae to be fused. Confronting surfaces of the mounting member and the vertebral fixation plate cooperate to keep the vertebral fixation plate in a desired location while it is fastened to the vertebrae being fused.