Knee Surg Sports Traumatol Arthrosc DOI 10.1007/s00167-014-3444-0
KNEE
High rate of implant loosening for uncemented resurfacing‑type medial unicompartmental knee arthroplasty Danilo Bruni · Stefano Zaffagnini · Francesco Iacono · Laura Bragonzoni · Mirco Lo Presti · Maria Pia Neri · Giulio Maria Marcheggiani Muccioli · Marco Nitri · Giovanni Raspugli · Maurilio Marcacci
Received: 14 December 2013 / Accepted: 13 November 2014 © European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2014
Abstract Purpose To determine the medium-term implant survivorship, the clinical results and the failure mechanisms of a novel unicompartmental arthroplasty for uncemented resurfacing of the medial tibio-femoral compartment. Methods Seventy-six consecutive patients were prospectively evaluated with a mean final follow-up of 6 years (SD 5.3 months). In 44 patients, the diagnosis was osteoarthritis, and in 32 patients, it was avascular necrosis of the medial femoral condyle. The Hospital for Special Surgery Score was used for objective clinical evaluation, and a selfadministered visual analogue scale was used to quantify residual pain at each observation point. Implant survivorship was determined assuming revision for any reason as endpoint. Results Nineteen patients were revised (6 with osteoarthritis and 13 with avascular necrosis of the medial femoral condyle). The mean interval time from index surgery to revision was 11.2 months (SD 4.66 months). Implant survivorship was higher in patients with osteoarthritis with respect to those with avascular necrosis of the medial femoral condyle (p = 0.018). Aseptic loosening was the most D. Bruni (*) · S. Zaffagnini · F. Iacono · M. Lo Presti · M. P. Neri · G. M. M. Muccioli · M. Nitri · G. Raspugli · M. Marcacci 2nd Orthopaedics and Traumatologic Clinic, Rizzoli Orthopaedic Institute, Via Pupilli 1, 40136 Bologna, Italy e-mail: [email protected]; [email protected] D. Bruni · L. Bragonzoni · M. Marcacci Biomechanics and Technologic Innovation Laboratory, Codivilla-Putti Research Center, Via di Barbiano 1/10, 40136 Bologna, Italy D. Bruni · L. Bragonzoni · M. Marcacci Bologna University, Bologna, Italy
frequent failure mechanism. Femoral component loosening was reported in five patients and tibial component loosening was reported in other six patients. Assuming revision for any reason as endpoint, an implant survivorship of 74.3 % at 6-year follow-up was determined. In the remaining 57 patients, satisfactory clinical results were obtained. Hospital for Special Surgery Score and visual analogue scale for residual pain showed significant improvements (p
KNEE
High rate of implant loosening for uncemented resurfacing‑type medial unicompartmental knee arthroplasty Danilo Bruni · Stefano Zaffagnini · Francesco Iacono · Laura Bragonzoni · Mirco Lo Presti · Maria Pia Neri · Giulio Maria Marcheggiani Muccioli · Marco Nitri · Giovanni Raspugli · Maurilio Marcacci
Received: 14 December 2013 / Accepted: 13 November 2014 © European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2014
Abstract Purpose To determine the medium-term implant survivorship, the clinical results and the failure mechanisms of a novel unicompartmental arthroplasty for uncemented resurfacing of the medial tibio-femoral compartment. Methods Seventy-six consecutive patients were prospectively evaluated with a mean final follow-up of 6 years (SD 5.3 months). In 44 patients, the diagnosis was osteoarthritis, and in 32 patients, it was avascular necrosis of the medial femoral condyle. The Hospital for Special Surgery Score was used for objective clinical evaluation, and a selfadministered visual analogue scale was used to quantify residual pain at each observation point. Implant survivorship was determined assuming revision for any reason as endpoint. Results Nineteen patients were revised (6 with osteoarthritis and 13 with avascular necrosis of the medial femoral condyle). The mean interval time from index surgery to revision was 11.2 months (SD 4.66 months). Implant survivorship was higher in patients with osteoarthritis with respect to those with avascular necrosis of the medial femoral condyle (p = 0.018). Aseptic loosening was the most D. Bruni (*) · S. Zaffagnini · F. Iacono · M. Lo Presti · M. P. Neri · G. M. M. Muccioli · M. Nitri · G. Raspugli · M. Marcacci 2nd Orthopaedics and Traumatologic Clinic, Rizzoli Orthopaedic Institute, Via Pupilli 1, 40136 Bologna, Italy e-mail: [email protected]; [email protected] D. Bruni · L. Bragonzoni · M. Marcacci Biomechanics and Technologic Innovation Laboratory, Codivilla-Putti Research Center, Via di Barbiano 1/10, 40136 Bologna, Italy D. Bruni · L. Bragonzoni · M. Marcacci Bologna University, Bologna, Italy
frequent failure mechanism. Femoral component loosening was reported in five patients and tibial component loosening was reported in other six patients. Assuming revision for any reason as endpoint, an implant survivorship of 74.3 % at 6-year follow-up was determined. In the remaining 57 patients, satisfactory clinical results were obtained. Hospital for Special Surgery Score and visual analogue scale for residual pain showed significant improvements (p
