Abstract:We have been performing arthroscopic superior capsular reconstruction (SCR) with acellular dermal allograft for almost 2 years. Our techniques are based on Mihata's original concept for SCR, in which he used fascia lata autograft. In this report, we describe our standard arthroscopic technique as well as 2 variations of a "zip-line" technique, which we have found particularly useful for large dermal allografts (grafts that are !40 mm in any dimension).

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Purpose Limited data exist regarding the long-term results or risk factors for failure after two-stage reimplantation for periprosthetic knee infection. The purpose of this retrospective review was to investigate infection-free implant survival and identify variables associated with reinfection after this procedure. Furthermore, a staging system was evaluated as a possible prognostic tool for patients undergoing two-stage reimplantation of infected total knee arthroplasty (TKA). Methods In this level II, retrospective prognostic study, 368 patients with infected TKA treated with a two-stage revision protocol at our institution between 1998 and 2006 were reviewed. Patients who developed recurrent infection and an equal number of patients randomly selected for the control group were analysed for risk factors associated with treatment failure. Results At the most recent follow-up, 58 (15.8%) patients had developed reinfection after the two-stage reimplantation. The median time to reinfection was 1,303 days (3.6 years), with follow-up time ranging from six to 2,853 days (7.8 years). The strongest positive predictors of treatment failure included chronic lymphoedema [hazard ratio (HR)=2.28, 95% confidence interval (CI) 1.16-4.48; p=0.02),and revision between resection and definitive reimplantation (HR=2.13, 95% CI 1.20-3.79; p=0.01, whereas patients treated with intravenously administered Cefazolin had a significant reduction in recurrent infection rate (HR=0.48, 95% CI 0.25-0.90; p=0.02). Conclusions Our findings should be of help in counselling patients regarding their prognosis when faced with twostage exchange for infected TKA and provide a basis for future comparisons.

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