Surgical Techniques for Performing a Through-Knee Amputation: A Systematic Review and Development of an Operative Descriptive System.

Background: Through-knee amputation (TKA) carries potential biomechanical advantages over above knee amputation (AKA) in patients unsuitable for a below-knee amputation. However, concerns regarding prosthetic fit, cosmesis and wound healing have tempered enthusiasm for the operation. Furthermore, there are many described surgical techniques for performing a TKA. This frustrates attempts to compare past and future comparative data, limiting the opportunity to identify which procedure is associated with the best patient centered outcomes. The aim of this systematic review is to identify all the recognized operative TKA techniques described in the literature and to develop a clear descriptive system to support future research in this area.

Methods: A systematic review was performed, searching the OVID, PubMed, and Cochrane Library databases, according to Cochrane and PRISMA guidelines. Papers of any design were included if they described an operative technique for a TKA. Key operative descriptions were captured and used to design a classification system for surgical techniques.

Results: A total of 906 papers were identified, of which 28 are included. The most important distinctions in operative technique were the level of division of the femur (disarticulation without bone division, transcondylar amputation, with or without shaving of the medial, lateral, and posterior condyles and supracondylar amputation), management of the patella (kept whole, partially preserved, completely removed), use of a muscular gastrocnaemius flap, and skin incisions. A 4-component classification system was developed to be able to describe TKA operative techniques. A suggested shorthand nomenclature uses the first letter of each component (FPMS; Femur, Patella, Muscular flap, Skin incision), followed by a number, to describe the operation. Patient outcomes were poorly reported, and therefore outcomes for different types of TKA are not addressed in this review.

Conclusions: A novel descriptive system for describing different techniques for performing a TKA has been developed. This classification system will help in reporting, comparing, and interpreting past and future studies of patients undergoing TKA.