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For over fifty years, unicompartmental knee arthroplasty (UKA) has been used to treat single compartment osteoarthritis of the knee. Despite the many years of experience performing UKA, the orthopaedic community has not reached a consensus on the patient selection criteria or operative indications for UKA, due to varied outcome results in the literature. Newly designed robotic-assisted systems are believed to increase the precision and accuracy with which unicompartmental knee arthroplasty can be performed, possibly leading to fewer mechanical failures and improved functional outcomes. However, long-term follow-up is required before definitive conclusions can be reached regarding this new technology. This review examines the history of UKA, reviews early results of robotic-assisted UKA and presents an outlook on future advances.

The aim of this paper is to review the influx of short stems for total hip arthroplasty. Not all short stems are created equal concerning fixation points for implant stability and length of engagement of the device in the proximal femur. Some devices are stabilized in the head, neck, metaphysis and metaphysis/diaphysis. Depending on stabilization and engagement area different short stems can have different indications, contraindications and clinical outcomes. As a result of our findings JISRF developed a classification system based on implant stabilization point and overall stem length.

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The review summarizes published literature from a range of reputable sources regarding hip prosthesis (stems) of a specific design style (Corail) used currently in cementless Total Hip Arthroplasty.The short-term results of the best cementless femoral components recorded in the Norwegian Arthroplasty Register as described by Havelin et al, include the Corail, IMT, Profile and Zweyuller stems with revision for loosening <1% at 4.5 years, compared to cemented counterparts. The critical review of published studies shows equivalence of the predicate Corail stem to the Signature CL2 femoral stem in all critical characteristics is demonstrated to represent the likely clinical performance of the CL2 stem implanted. This is using modern surgical techniques without cement.