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AGA2012-130
MIDTERM ERGEBNISSE DES KINESPRING-SYSTEM
MIDTERM RESULTS OF THE KINESPRING® SYSTEM IMPLANTABLE LOAD ABSORBER
Authors
* Rhys Williams Cardiff and Vale NHS Trust University Hospital of Wales, Cardiff, United Kingdom
* Nick London Harrogate and District NHS Trust, Harrogate, United Kingdom
David Hayes Brisbane Private Hospital Level Five Arnold Janssen Centre, Brisbane, Australia
Craig Waller St Vincent's Clinic, Darlinghurst, Australia
Timothy Wilton Royal Derby Hospital, Derby, United Kingdom
James Richardson Robert Jones and Agnes Hunt Orthopaedic, Oswestry, United Kingdom
Rene Verdonk Ghent University Hospital Dept. of Orthopaedic Surgery, Gent, Belgium
Fredrik Almqvist Ghent University Hospital Dept. of Orthopaedic Surgery, Gent, Belgium
Abstract
Fragstellung: Joint unloading is part of routine clinical practice as a standalone or concomitant therapy for a
wide range of potential indications: for focal cartilage defects, adjunctive to cartilage regeneration or meniscal
repair surgery, or as a standalone treatment for end stage degenerative disease in an attempt to delay joint
replacement.
These potential indications are particularly worrisome in young, active patients are not ideal candidates for
arthroplasty. The KineSpring® System (Moximed, Inc., USA), an implantable load absorbing device, was
evaluated for the treatment of pain secondary to medial knee OA in this patient population. Here we report the
midterm results of the joint unloading implant.
Methodik: The KineSpring System was implanted in 100 patients, with the longest duration exceeding 3.5 years
(mean 19, range: 2 - 43 months). The treated group had medial knee OA, included younger or more active OA
sufferers (mean 52, range 31 - 75 years), with a mean BMI = 30.2 kg/m2. Acute implant success, adverse events,
and clinical outcomes using the WOMAC and Knee Society Scores (KSS) were recorded at baseline, post-op, 2
and 6 weeks, and 3, 6, 12 and 24 months post-op, then annually thereafter.
Ergebnis: All patients were successfully implanted with a mean procedure time of 68 min (range 40 - 153
minutes). Hospital stays were short (99% of patients were released in less than one week). Patients recovered
rapidly, generally achieving full weight bearing by 2 weeks and normal range of motion by 6 weeks. Formal
physical therapy was not routinely prescribed. Clinically meaningful and statistically significant pain reduction and
functional improvement were noted with baseline WOMAC pain scores (0-100 scale) improving from 45.1 to 21.3
(p