A PEEK spacer for use in the spine is disclosed. The PEEK spacer may be configured to fit through Kambin's Triangle and expand upon insertion.

An acetabular cup prosthesis comprising: an inner cup surface and an outer cup surface, said inner cup surface meeting said outer cup surface at a rim of said cup, wherein said inner cup surface, said outer cup surface or both said inner cup surface and said outer cup surface comprises an engagement formation located proximal to said rim, said engagement formation extending around at least a portion of the circumference of the cup; and a Sip member comprising an engagement formation configured to cooperate with the engagement formation of the cup.

In an artificial joint that includes a head assembly attached by taper fit to a proximal portion of a surgically implanted stem, it may become necessary to surgically remove the head assembly. A puller can simultaneously apply a force distally to a non-peripheral portion of a proximal side of the head assembly and proximally to several locations spaced apart around a circumference of the distal side of the head assembly. In some examples, the proximal side of the head assembly includes a plug disposed at the non-peripheral portion. The puller can force the plug into contact with the proximal end of the stem, then apply the distal force through the plug to the stem. In other examples lacking a plug, the non-peripheral portion of the head can deform or break in response to the applied distal force, so that the distal force can apply to the stem.

An implant suitable for being anchored with the aid of mechanical vibration in an opening provided in bone tissue. The implant is compressible in the direction of a compression axis under local enlargement of a distance between a peripheral implant surface and the compression axis. The implant includes a coupling-in face which serves for coupling a compressing force and the mechanical vibrations into the implant, which coupling-in face is not parallel to the compression axis. The implant also includes a thermoplastic material which, in areas of the local distance enlargement, forms at least a part of the peripheral surface of the implant.

Disclosed is a device for positioning a resurfacing prosthesis, including: a gripping and handling instrument for a main body of a resurfacing prosthesis; a connecting body, interposed between said gripping and handling instrument and said main body of said resurfacing prosthesis and suitable to connect them; a coupler which secures said connecting body to said main body, said coupler comprising: a plurality of bonding elements adapted to be interlocked, in an irremovable manner, in respective recesses provided in said connecting body; and a shear releaser, interposed between said main body of said resurfacing prosthesis and said connecting body, adapted to detach said connecting body from said main body. Other aspects are described and claimed.

The strength of bone implant attached to a bone is improved by using hybrid inserts which have stems and wings having bone ingrowth surface features and caps having outer surfaces of cured polymethyl methacrylate (PMMA). The stems and wings of the hybrid inserts are inserted into living bone and the bone implant is attached to the hybrid inserts with PMMA cement. Over time, the bone grows into the bone ingrowth surface features. The bone ingrowth strengthens the bonding of the hybrid inserts and the bone implant with the bone over time. The hybrid inserts increase the shear, tensile and torque strength of the bone implants. Bone inserts that do not have ingrowth surface features loosen over time.

Surgical kits comprising a tool having a handle and a shaft affixed to the handle at one end and a free end having a threaded connection, at least two disc inserts, each disc insert comprising a rounded square having an annular wall surrounding a top surface and a bottom surface, wherein a threaded catch is formed in each disc insert to mate with the threaded connection, and wherein the interface between the disc insert top surface and annular wall forms a first perimeter and the interface between the disc insert bottom surface and the annular wall forms a second perimeter. At least a portion of the disc inserts can be radiopaque and a portion can be radiolucent. Also provided are kits having one or more disc inserts and one or more trial plates, each trial plate comprising a plurality of positioning guides.

A method for producing a spacer for insertion as a placeholder for an articular endoprosthesis, whereby a cement is filled into a compressed hollow space of a flexible compressed hollow mold, whereby the flexible hollow mold is expanded by the cement flowing into it, and the cement is filled into the hollow mold until the hollow space is expanded to a final state, whereby the hollow space in its final state determines the shape of the spacer to be produced, and the cement is then cured in said hollow space, and the spacer produced from the cement is removed from the hollow mold after curing. The invention also relates to the hollow mold, which comprises the compressible hollow space, whereby the hollow mold comprises at least one filling opening through which cement can be filled into the hollow space.

An intervertebral spacer is disclosed having a main body and an articulating component that is pivotally mounted within an opening of the main body. The intervertebral spacer is designed to be manufactured using an additive manufacturing process without the use of any frangible support material between a main body of the intervertebral spacer and an articulating component of the intervertebral spacer. To this end, an article of manufacture is provided in which supports are formed prior to forming intervertebral spacer. The supports are configured to support the main body and the articulating component such that they can be separately, but simultaneously manufactured using an additive manufacturing process atop the supports, without the need for any frangible support material therebetween.

An intervertebral spacer is disclosed having a main body and an articulating component that is pivotally mounted within an opening of the main body. The intervertebral spacer is designed to be manufactured using an additive manufacturing process without the use of any frangible support material between a main body of the intervertebral spacer and an articulating component of the intervertebral spacer. To this end, an article of manufacture is provided in which supports are formed prior to forming intervertebral spacer. The supports are configured to support the main body and the articulating component such that they can be separately, but simultaneously manufactured using an additive manufacturing process atop the supports, without the need for any frangible support material therebetween.