Abstract: A prosthetic implant useful in a cementless application is disclosed. The implant may include a curved bone facing surface and one or more pegs or keels. Preferably, the implant is implanted on a bone surface that has been prepared so as to allow for a snap fit between the implant and the bone.

Abstract: A system for replacing a trochlear groove region of a femur. The system includes a prosthesis that includes a bone contact surface and a periphery that defines an outer perimeter. The bone contact surface has a plurality of protrusions and a spatial configuration with respect to one another. Additionally, the system includes a first template that has a plurality of guide holes and a first periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. Also, included in the system is a second template that has a plurality of guide holes and a second periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. The plurality of guide holes of the second template are spatially arranged with respect to the second periphery to substantially match the spatial configuration of the plurality of protrusions of the prosthesis.

Abstract: A method of performing surgery on a bone includes providing a robotically controlled bone preparation system and creating at least one hole in the bone with the robotically controlled bone preparation system prior to machining the bone. The bone hole aligns with a hole or a post in a guide for a manual cutting tool. If the robot fails during surgery, or if the surgeon does not wish to complete the procedure with the robot, the guide is attached to the bone after aligning the guide hole with the bone hole. The surgery is completed manually after the guide is attached to the bone, and the robot is not used after the guide is attached to the bone.

Abstract: A method for replacing a joint surface, which includes resecting a first portion of the joint surface to create a wall surface and inner resected surface. The wall surface (2006) separates the inner resected surface and a non-resected portion of the joint surface. Further included in the method is cutting a concave groove having a first radius into the wall surface, and engaging the concave groove with a periphery of a joint prosthesis. The periphery includes a second radius that is substantially the same as the first radius of the concave groove.

Abstract: Disclosed herein are methods of designing and fabricating prosthetic implants having a sagittal wall in which at least a portion thereof traverses a non-linear path. A method of fabricating such a prosthetic implant may include generating a virtual bone model based on image information obtained from at least one bone, determining a proposed height of the prosthetic implant at a first location on the virtual bone model, determining a proposed resection depth into the at least one bone at the first location based at least in part on the proposed height of the prosthetic implant, and determining a curved resection path across a portion of the virtual bone model. The curved resection path may intersect the first location and the prosthetic implant may have a curved sagittal wall corresponding to the curved resection path.

Abstract: Disclosed herein are tibial baseplates having a medial portion and a lateral portion, each of the medial and lateral portions having a proximal surface and a distal surface opposite the proximal surface. An intermediate portion joins the medial and lateral portions, wherein the intermediate portion has a proximal surface angled to the proximal surfaces of the medial and lateral portions about a longitudinal axis of the tibial baseplate. The proximal surface of the medial portion is stepped from the proximal surface of the lateral portion about the longitudinal axis. The proximal surfaces of the medial and lateral portions are configured to receive corresponding medial and lateral inserts.

Abstract: A method for aligning an orthopedic implant in a joint replacement includes determining the bone and cartilage deficiency from an undegenerated state caused by wear of a joint. Then a resection of a bone in the joint is made based on the deficiency of bone and cartilage from the undegenerated state and the size of a joint implant so as to locate the joint surface of the implant in the undegenerated cartilage location. The condylar wear from the undegenerated states may be assessed at a distal and posterior location on each of a medial and a lateral femoral condyle. A distal cut is made on the femur at a location adjusting for the condylar wear from the undegenerated state. The distal cut varus-valgus angle is oriented parallel to a plane across the distal femur after adjusting for wear in the distal location on the medial and lateral condyle.

Abstract: A method for aligning an orthopedic implant in a joint replacement includes determining the bone and cartilage deficiency from an undegenerated state caused by wear of a joint. Then a resection of a bone in the joint is made based on the deficiency of bone and cartilage from the undegenerated state and the size of a joint implant so as to locate the joint surface of the implant in the undegenerated cartilage location. The condylar wear from the undegenerated states may be assessed at a distal and posterior location on each of a medial and a lateral femoral condyle. A distal cut is made on the femur at a location adjusting for the condylar wear from the undegenerated state. The distal cut varus-valgus angle is oriented parallel to a plane across the distal femur after adjusting for wear in the distal location on the medial and lateral condyle.

Abstract: Disclosed herein are knee replacement systems for replacing the articular surface of a distal femur. The systems include one or more unicompartmental components, namely patellofemoral, lateral condylar and medial condylar components. The components are configured such that when engaged to the femur the peripheries thereof do not cross specific locations and/or regions of the femur, namely the intercondylar notch and condylopatellar notch. The patellofemoral components described herein preferably have an extension portion extending posteriorly from a posterior periphery thereof towards an intercondylar notch or the femur without contacting the intercondylar notch of the femur when the patellofemoral component is engaged to the femur. The extension portion preferably extends posteriorly from posterior periphery of the patellofemoral component towards the condylopatellar notch of the femur without contacting the notch.

Abstract: A bone resection guide, which includes a profiling guide. The profiling guide includes a first planar bone contact surface, a first guide surface and at least one outline corresponding to at least a portion of a first implant.

Abstract: Disclosed herein are systems and methods for performing total hip arthroplasty with patient-specific guides Pre-operative images of a pelvic region of a patient are taken in order to predefine the structure of the guides and corresponding implants. From the obtained image data an insertional vector for implanting an acetabular implant or component into an acetabulum of the patient is determined, wherein the insertional vector is coaxial with a polar axis of the acetabular component. Also from the obtained image data, a superior surface of the guides and implants can be shaped to match the acetabulum of the patient. A nub portion extending outwardly from the superior surface of the guides and implants is shaped to substantially match the shape of a fovea of the acetabulum. A guide portion of the guides forming a slot has a longitudinal axis coaxial with the determined insertional vector of a corresponding acetabular component.

Abstract: A method for aligning an orthopedic implant in a joint replacement includes determining the bone and cartilage deficiency from an undegenerated state caused by wear of a joint. Then a resection of a bone in the joint is made based on the deficiency of bone and cartilage from the undegenerated state and the size of a joint implant so as to locate the joint surface of the implant in the undegenerated cartilage location. The condylar wear from the undegenerated states may be assessed at a distal and posterior location on each of a medial and a lateral femoral condyle. A distal cut is made on the femur at a location adjusting for the condylar wear from the undegenerated state. The distal cut varus-valgus angle is oriented parallel to a plane across the distal femur after adjusting for wear in the distal location on the medial and lateral condyle.

Abstract: A dynamic trialing method generally allows a surgeon to perform a preliminary bone resection on the distal femur according to a curved or planar resection profile. With the curved resection profile, the distal-posterior femoral condyles may act as a femoral trial component after the preliminary bone resection. This may eliminate the need for a separate femoral trial component, reducing the cost and complexity of surgery. With the planar resection profile, shims or skid-like inserts that correlate to the distal-posterior condyles of the final insert may be attached to the distal femur after the preliminary bone resection to facilitate intraoperative trialing. The method and related components may also provide the ability of a surgeon to perform iterative intraoperative kinematic analysis and gap balancing, providing the surgeon the ability to perform necessary ligament and/or other soft tissue releases and fine tune the final implant positions based on data acquired during the surgery.

Abstract: A method for aligning an orthopedic implant in a joint replacement includes determining the bone and cartilage deficiency from an undegenerated state caused by wear of a joint. Then a resection of a bone in the joint is made based on the deficiency of bone and cartilage from the undegenerated state and the size of a joint implant so as to locate the joint surface of the implant in the undegenerated cartilage location. The condylar wear from the undegenerated states may be assessed at a distal and posterior location on each of a medial and a lateral femoral condyle. A distal cut is made on the femur at a location adjusting for the condylar wear from the undegenerated state. The distal cut varus-valgus angle is oriented parallel to a plane across the distal femur after adjusting for wear in the distal location on the medial and lateral condyle.

Abstract: Disclosed herein are systems and methods for performing total hip arthroplasty with patient-specific guides Pre-operative images of a pelvic region of a patient are taken in order to predefine the structure of the guides and corresponding implants. From the obtained image data an insertional vector for implanting an acetabular implant or component into an acetabulum of the patient is determined, wherein the insertional vector is coaxial with a polar axis of the acetabular component. Also from the obtained image data, a superior surface of the guides and implants can be shaped to match the acetabulum of the patient. A nub portion extending outwardly from the superior surface of the guides and implants is shaped to substantially match the shape of a fovea of the acetabulum. A guide portion of the guides forming a slot has a longitudinal axis coaxial with the determined insertional vector of a corresponding acetabular component.

Abstract: Disclosed herein are systems and methods for bone preparation with designed areas having accurate tolerance profiles to enable improved initial fixation and stability for cementless implants and to improve long-term bone ingrowth/ongrowth to an implant. A method of preparing a bone surface to receive a prosthetic implant thereon having an articular surface and a bone contacting surface includes resecting the bone surface at a first location to create a first resected region having a first tolerance profile with a first cross-section, resecting the bone surface at a second location to create a second resected region having a second tolerance profile with a second cross-section less dense than the first cross-section, and contacting the bone contacting surface of the prosthetic implant with the first resected region.

Abstract: The tissue augment sheet delivery system includes a tube funnel adapter and a tissue augment sheet delivery instrument. The tube funnel adapter includes a oval/conical shaped funnel. The tissue augment sheet delivery instrument includes a handle. A cylindrical tube is connected to the handle. A wire is inserted in the tube. The wire is formed in a large loop with small loops formed in the large loop. A tissue augment sheet is attached to one side of the large loop using a monofilament. In use, the tube funnel adapter is inserted in body. The tissue augment sheet is placed in mouth of the oval/conical shaped funnel and gently moved down. While moving down, the tissue augment sheet conforms to the internal diameter of the tube funnel adapter. The handle is withdrawn to remove the large loop from the body leaving the tissue augment sheet in body.

Abstract: A system for replacing a trochlear groove region of a femur. The system includes a prosthesis that includes a bone contact surface and a periphery that defines an outer perimeter. The bone contact surface has a plurality of protrusions and a spatial configuration with respect to one another. Additionally, the system includes a first template that has a plurality of guide holes and a first periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. Also, included in the system is a second template that has a plurality of guide holes and a second periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. The plurality of guide holes of the second template are spatially arranged with respect to the second periphery to substantially match the spatial configuration of the plurality of protrusions of the prosthesis.

Abstract: An instrument system for setting the internal-external rotation of a prosthetic femoral component with respect to a proximal tibia has a bone resection instrument having a planar surface for engaging a planar surface of a resected distal femur. The bone resection instrument system has a cutting guide for guiding a tool for resecting a posterior surface of the distal femur and forming a cylindrical surface on the posterior condyle intersecting the planar surface. The cylindrical surface defined by an axis extending in a direction generally perpendicular to the resected planar surface. The system includes a trial component having a planar surface for engaging the planar surface of the resected distal femur and having posterior condyles having a cylindrical anteriorly facing surface engagable with the resected cylindrical surface on the posterior condyle.

Abstract: A joint spacer having a body and a series of extensions projecting therefrom is disclosed. A first of the series of extensions may include a curved section for housing a portion of a joint therein (e.g., the intercondylar notch of a knee), and a second and third of the extensions may be configured to abut an opposing portion of the joint. Once inserted, the joint spacer may maintain the spacing between, and the stabilization of, the joint during surgery. A fourth extension may be included with the spacer in which the extension may interact with an insertion-removal instrument. The insertion-removal instrument may include one end having an insertion geometry for use in inserting the spacer into the joint, and an opposing end having a removal geometry for removing the spacer. Related methods for inserting the joint spacer and various alternate joint distraction devices are also disclosed.