A shell (1) for a prosthetic joint to be driven into a bone substance. The shell having an outer lateral surface (4) which is convexly curved in cross section and on which a plurality of ribs (5) is arranged. All ribs extend in the same direction at a preferably increasing gradient angle of 45° to 85° at the equatorial end (6) to a pole-side end (7). The cumulative flank projection area of all ribs (5) corresponds to at least a fifth of the entire outer lateral surface. As a result of this measure, a very high primary stability is achieved once the shell has been driven in, the shell being screwed into the bone substance very precisely and without bone material being sheared off. This arrangement can also be applied, similarly, to a concavely curved inner lateral surface.

A system for aligning components of a prosthetic includes a mounting plate, a fastener and an adapter coupling plate. The mounting plate comprises: a first major surface; a second major surface opposing the first major surface; an adapter accommodation hole extending through the mounting plate; and sizing indicia located on the second major surface. The fastener extends from the mounting plate. The adapter coupling plate comprises: a third major surface; a fourth major surface opposing the third major surface; an adapter coupling hole extending through the adapter coupling plate and surrounded by the adapter accommodation hole; and an indicator located on the fourth major surface to point to the sizing indicia on the mounting plate. The adapter coupling plate can be slidable along a slot surrounding the fastener or a tongue and groove system connecting the adapter coupling plate and the mounting plate and locked via the fastener.

A stemless prosthetic shoulder joint may include a prosthetic humeral head and a stemless base. The stemless base may include a collar and an anchor extending from the collar intended to anchor the base into the proximal humerus. The anchor may include various features to enhance the fixation of the base, including hooks, threads, and/or expandable members that may be transitioned from a contracted insertion condition to an expanded implanted condition once the base is positioned in the bone. The anchor and/or collar may also include additional features to enhance fixation, such as geometries and surface features to enhance fixation to bone. The anchor may include a plurality of chisel slots to facilitate removal of bone during a revision surgery.

A shoulder implant system comprising a glenoid implant; a baseplate comprising an implant facing surface to face the glenoid implant; wherein the glenoid implant comprises at least one fixation element configured to engage with at least one fixation element of the baseplate; wherein the at least one fixation element of the glenoid implant comprises a center post having a distal end; wherein the at least one fixation element of the baseplate comprises a center post receptacle; wherein the baseplate comprises an outer periphery; wherein the implant facing surface of the baseplate comprises a channel which extends from the outer periphery of the baseplate to the center post receptacle of the baseplate; and wherein the channel is configured such that, during an assembly of the glenoid implant and the baseplate, the distal end of the post is movable in the channel from the outer periphery of the baseplate to the center post receptacle of the baseplate.

Systems for arthroplasty, and methods of designing an arthroplasty system, such as in reverse arthroplasty, are provided that include an increased impingement-free range of motion. The systems and methods provide for a geometry of the reverse components to address the deficit of limited range of motion included with conventional reverse arthroplasty and thereby enhance a patient's quality of life.

An articular component is provided that includes an articular body having an articular surface, a bone anchor, a coupling portion, and a coupler. The bone anchor includes a distal end configured to be lodged in a bone and a proximal face. The coupling portion includes a recessed area in the articular body disposed between the articular surface and the distal end of the bone anchor. The coupler includes a first portion configured to mate with the coupling portion at a selected rotational position, and a second portion opposite the first portion, wherein the second portion is configured to couple, directly or indirectly, the articular body with the bone anchor.

Various embodiments disclosed herein relate to a humeral resection guide. The humeral resection guide can include a cutting block having a side surface and a cutting surface. The cutting surface can be configured to constrain at least one degree of freedom of movement of a cutting instrument during surgical alteration of the humerus. The humeral resection guide can include a boom extending away from the cutting surface of the cutting block, the boom comprising a cut depth adjustment feature disposed along at least a portion of a length of the boom. The humeral resection guide can include a cut depth indicator disposed at a population derived location along the length of the boom. The cut depth indicator can be configured to indicate that the cutting surface is at a target cut depth for the alteration of the humerus when the cut depth indicator is aligned with a support.

A novel method and instrumentation for insertion of humeral and glenoid total shoulder implant using arthroscopic visualization for bony preparation as well as insertion of components through small incisions. Mini instruments and cannulated guides and reamers are used in order to perform the procedure under direct arthroscopic visualization. For ease of insertion, the components are inserted separately and assembled in situ. Securing the humeral components in place is accomplished with bicortical screw transfixing the central peg of component. Also disclosed are components, parts thereof and instruments used therewith.

A system for preparing a knee may include a marking guide with a handle and a tibial marking portion extending from the handle. The handle may have a tibial alignment feature shaped to be aligned with a first corresponding feature of a tibia and a tibial marking guide shaped to guide motion of a marking instrument to provide, on the tibia, a tibial mark that identifies a tibial location at which a tibial component is to be placed on the tibia. The marking guide may further have a femoral marking portion with a femoral alignment feature shaped to align the femoral marking portion with the tibial marking portion and/or the tibial mark, and a femoral marking guide shaped to guide motion of a marking instrument to provide, on a femur, a femoral mark that identifies a femoral location at which a femoral component is to be placed on the femur.

A method of performing an arthroplasty procedure on a shoulder that includes the following steps, among others. A step of accessing a posterior aspect of the humeral head. A step of cutting the humeral head in a posterior-to-anterior direction so as to form a resected bone surface. A step of cutting at least one channel into the resected bone surface and through a posterior aspect of the humeral cortex, the at least one channel extending in a posterior-anterior direction. A step of attaching a first component including a base plate of a joint replacement system to the resected bone surface, the base plate including at least one fin that is received within the at least one channel. A step of attaching a second component of the joint replacement system to the base plate.