Abstract: A knee arthroplasty system may have a femoral joint prosthesis with a femoral bone engagement surface with an anterior portion, a posterior portion, and a distal portion that connects the anterior portion to the posterior portion. A first femoral anchoring member may protrude from the distal portion, and may be connected to the anterior portion with a primary femoral web. A tibial resection guide may have a base member and a guide member with a slot that guides a cutting blade to resect the tibial plateau. The guide member may slide along an arcuate path relative to the base member.

Abstract: An assembly may include a retractor pivotally coupled to a guide rod. The retractor may include a generally arcuate projection having a convex retractor surface, a concave cutting shield surface, and a retractor coupling feature. The guide rod may include an elongate member and a rod coupling feature that may be configured to engage the retractor coupling feature to pivotably couple the guide rod to the retractor. The assembly may be placed on a lateral side of a medial collateral ligament of a knee joint to retract the medial collateral ligament away from a tibial plateau of the knee joint and protect the medial collateral ligament during a tibial plateau resection procedure.

Abstract: A knee arthroplasty system may have a femoral joint prosthesis with a femoral bone engagement surface with an anterior portion, a posterior portion, and a distal portion that connects the anterior portion to the posterior portion. A first femoral anchoring member may protrude from the distal portion, and may be connected to the anterior portion with a primary femoral web. A tibial resection guide may have a base member and a guide member with a slot that guides a cutting blade to resect the tibial plateau. The guide member may slide along an arcuate path relative to the base member.

Abstract: A prosthesis for replacing a natural articular surface on a bone may have a joint facing side with an articular surface, a bone anchoring side with a bone engagement surface, and a bone engagement pad secured to at least part of the bone engagement surface. The bone engagement pad may have a transverse portion extending transverse to a length of the bone, and one or more protruding portions extending generally perpendicular to the transverse portion. The transverse portion may have a pad bone-facing surface with a first porosity level, and a pad joint-facing surface on an opposite side of the transverse portion from the pad bone-facing surface, with a second, lower porosity level. The bone engagement surface may be formed via a first manufacturing process selected from the group consisting of forging, milling, and casting. The bone engagement pad may be formed via an additive manufacturing process.

Abstract: Implant assemblies, systems, kits, and methods for replacing a knee joint may include a universal femoral trial component for preparing and trialing a femoral bone of a patient to receive a plurality of different femoral implant types. The universal femoral trial component may be configured to receive any of a plurality of femoral bone preparation attachments and any of a plurality of femoral trial attachments in order to facilitate the preparation and trialing of the femoral bone to receive the plurality of different femoral implant types.

Abstract: Implant assemblies, systems, and methods for replacing a knee joint may include a method of revising a knee joint prosthesis implanted in a knee of a patient to provide increased stability to the knee joint prosthesis by replacing a first tibial insert with a second tibial insert that provides more constraint that the first tibial insert. A knee joint prosthesis system and kit are also provided that may include a tibial baseplate component, a femoral component, and a tibial insert that is selectively interchangeable with other tibial inserts to provide varying levels of constraint and stability to the knee joint prosthesis.