Short-term safety and efficacy of a novel high tibial osteotomy system: a case controlled study

Knee Surg Sports Traumatol Arthrosc. 2013 Jan;21(1):260-9. doi: 10.1007/s00167-011-1709-4. Epub 2011 Oct 18.


Purpose: To evaluate the safety and efficacy of the novel iBalance Medial Opening Wedge High Tibial Osteotomy (HTO) system in executing lower limb realignment in patients with symptomatic varus gonarthrosis.

Methods: A multicentre case series of iBalance medial opening wedge HTO was compared to an historic case-matched control series of HTO's performed using another implant. Subjects were prospectively observed at 3, 6 and 12 months after surgery. Primary endpoints included the reporting of adverse events, weight-bearing status without pain and radiographic evidence of bony union. Secondary endpoints included maintenance of osteotomy correction angle, patient reported outcome (KOOS and SF-36) and gait analysis.

Results: Thirty-two consecutive patients were included in the iBalance group (mean age 49.7, 30-67; M:F, 20:12), paired with 32 control subjects (49.8, 35-66; 21:11). Three patients (9.4%) in the iBalance group experienced a complication requiring intervention versus one patient (3.1%) in the control group. No statistically significant differences were seen between groups in terms of time to weight bearing, radiographic union, implant stability or patient reported outcome. Gait analysis revealed a statistically significant reduction in knee external adduction moment (P < 0.001).

Conclusions: The iBalance medial opening wedge HTO system has been shown to be a safe, novel implant for use in proximal tibial osteotomy. This study shows that the iBalance medial opening wedge HTO system has an equivalent short-term safety and efficacy profile to the 2nd generation Puddu system.

Publication types

  • Clinical Trial
  • Comparative Study
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Bone Plates*
  • Female
  • Follow-Up Studies
  • Genu Varum / complications
  • Genu Varum / surgery*
  • Humans
  • Knee Joint / surgery*
  • Male
  • Matched-Pair Analysis
  • Middle Aged
  • Osteoarthritis, Knee / complications
  • Osteoarthritis, Knee / surgery*
  • Osteotomy / instrumentation*
  • Osteotomy / methods
  • Pilot Projects
  • Postoperative Complications / epidemiology
  • Prospective Studies
  • Tibia / surgery*
  • Treatment Outcome