The present invention relates to devices and methods for balancing joints, including knee joints. The devices convert unequal forces at a joint to a rotation or displacement of a pointer or gauge. The devices are able to display the relative difference in force between the lateral and medial sides of a joint from flexion to extension. In certain aspects, the devices are useful for balancing the knee during total knee surgery. The devices can be inserted between the trial femoral and tibial components of the knee and measures whether one condyle experiences more force than the other.

The present disclosure provides a sacral prosthesis, comprising: a prosthesis main body, the prosthesis main body including two first prosthesis bodies and a second prosthesis body connected between the two first prosthesis bodies the two first prosthesis bodies and the second prosthesis body being of an integrally prototyped structure, a second end of each of the first prosthesis bodies being contacted and matched with an ilium, and a top of the second prosthesis body being contacted and matched with a lumbar vertebral body; and a screw-rod structure, the screw-rod structure including a connecting seat and a rod body, the connecting seat being connected with the prosthesis main body, and the rod body being fixed on the connecting seat. The technical solutions of the present disclosure can effectively solve the problems of unreliable supporting and easy fatigue break of the screw-rod system in the related technology.

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 screw 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 through a coupling means, wherein the plate portion contains screws holes for receiving screws. A screw back out prevention mechanism adapted on the plate portion and prevents the back out of screws from the screw holes.

A knee joint implant that prevents hyperextension includes a femoral component having an anterior surface with reference to the lowermost point of a convex condyle, the anterior surface being configured to have different curvature radii in respective sections thereof, and a bearing component having an anterior surface with reference to the lowermost point of a concave articular surface, the anterior surface being configured to have different curvature radii in respective sections, so that when an extended knee is about to be hyperextended, the convex condyle of the femoral component slides toward the anterior side and is brought into contact with a plurality of points of the concave articular surface of the bearing component, thereby producing resistance so as to suppress hyperextension exceeding a design range due to behavioral habits, a decrease in muscle mass, and the like of the patient.

An artificial knee joint includes a tibial component implanted into the proximal end of a tibia, and a bearing component coupled to the tibial component, in which the tibial component includes an interference prevention portion capable of preventing interference with the bearing component when the bearing component is inserted diagonally and the bearing component includes a protrusion coupled to the interference prevention portion.

The present disclosure relates to a cervical artificial disc and a method of constructing the same, and to the cervical artificial disc and the method, in which an available space into which the cervical artificial disc is to be inserted is modeled by designating a plurality of landmarks, and the cervical artificial disc is designed based on the available space modeling, when designing the cervical artificial disc for a patient who requires cervical artificial disc replacement surgery.

The present disclosure provides a sacral prosthesis, comprising: a prosthesis main body, the prosthesis main body including two first prosthesis bodies and a second prosthesis body connected between the two first prosthesis bodies the two first prosthesis bodies and the second prosthesis body being of an integrally prototyped structure, a second end of each of the first prosthesis bodies being contacted and matched with an ilium, and a top of the second prosthesis body being contacted and matched with a lumbar vertebral body; and a screw-rod structure, the screw-rod structure including a connecting seat and a rod body, the connecting seat being connected with the prosthesis main body, and the rod body being fixed on the connecting seat. The technical solutions of the present disclosure can effectively solve the problems of unreliable supporting and easy fatigue break of the screw-rod system in the related technology.

The present invention relates to devices and methods for balancing joints, including knee joints. The devices convert unequal forces at a joint to a rotation or displacement of a pointer or gauge. The devices are able to display the relative difference in force between the lateral and medial sides of a joint from flexion to extension. In certain aspects, the devices are useful for balancing the knee during total knee surgery. The devices can be inserted between the trial femoral and tibial components of the knee and measures whether one condyle experiences more force than the other.

The embodiments provide provides devices, instruments, and associated methods for treating joint pain. A joint is evaluated using magnetic resonance imaging to detect any defects in the subchondral bone. For example, using T2-weighted MRI images, bone marrow lesions or edemas can be identified, and using T1-weighted MRI images, associated regions of sclerotic bone adjacent to the bone marrow lesion can be identified. The treatment method may involve introducing a bone void filler material at the site to address the bone marrow lesion or edema, and/or drilling and inserting an implant to address the sclerotic bone, bone marrow lesion or edema, and insufficiency or stress fractures. An access path is mapped to a location in the subchondral region where the insufficiency fracture resides. The access path attempts to preserve an articular surface of the joint. A reinforcing member that stabilizes the insufficiency fracture is then implanted via the access path.

The embodiments provide provides devices, instruments, and associated methods for treating joint pain. A joint is evaluated using magnetic resonance imaging to detect any defects in the subchondral bone. For example, using T2-weighted MRI images, bone marrow lesions or edemas can be identified, and using T1-weighted MRI images, associated regions of sclerotic bone adjacent to the bone marrow lesion can be identified. The treatment method may involve introducing a bone void filler material at the site to address the bone marrow lesion or edema, and/or drilling and inserting an implant to address the sclerotic bone, bone marrow lesion or edema, and insufficiency or stress fractures. An access path is mapped to a location in the subchondral region where the insufficiency fracture resides. The access path attempts to preserve an articular surface of the joint. A reinforcing member that stabilizes the insufficiency fracture is then implanted via the access path.