The iDuo Bi-compartmental Knee Replacement: Our Early Experience.

Abstract

We present the first UK single surgeon case series for the iDuo knee. This is a CT based custom fit monolithic bi-compartmental design that resurfaces both trochlea and condyle. Perceived benefits include maintenance of normal kinematics and preservation of bone stock on the unaffected side. The femoral component is tailored to the patient with no compromise of either the trochlea or femoral geometry. Method Patients were selected based on functional ability and physiological age who had an intact symptom free lateral compartment. Knee Society scoring (KSS) was performed pre-operatively and at regular intervals. Patients were asked whether they would undergo the same operation at the one-year mark. Results Seven patients have undergone this procedure from 2013 until present. Average age is 60 (Range 55- 82).  Average pre-op KSS was 108. All patients consistently scored higher at each interval follow up with excellent results at one year (Av KSS 194). This benefit was seen past two years in all but one in those reaching this point. Conclusion Our early results suggest that the iDuo knee is a good option for those with isolated bi-compartmental disease and outcome scores are comparable with those reported for the BKA. This bi-compartmental design may bridge the gap between the uni-compartmental and total knee replacement. The choice between monolithic or modular designs remains in debate. We will continue to use this prosthesis for a carefully selected group of patients.