Unicompartmental Knee Arthroplasty Outcomes and Techniques

Unicompartmental knee arthroplasty (UKA) offers a less invasive solution for patients with osteoarthritis confined to a single compartment of the knee. By preserving unaffected joint surfaces, cruciate ligaments and bone stock, UKA can deliver more physiological kinematics, faster rehabilitation and superior patient-reported function compared with total knee replacement in appropriately selected cases. Long-term survival has steadily improved with refinements in implant design, surgical technique and patient selection, with modern series reporting ten-year implant survival of over 90 per cent. Cost-effectiveness analyses have demonstrated that, when performed by experienced teams, UKA confers both health benefits and lifetime cost savings relative to total knee arthroplasty. Recent innovations in intraoperative technology—ranging from haptic-controlled robotic assistance to real-time force sensors—have further enhanced component positioning and soft-tissue balance. Training studies using large registry datasets show that trainees under appropriate supervision achieve comparable implant survival to consultants, supporting the safe dissemination of UKA techniques. Ongoing emphasis on learning curves, standardised indications and precision technologies continues to expand the global impact and accessibility of this procedure.

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Unicompartmental Knee Arthroplasty Outcomes and Techniques publication trend

The graph below shows the total number of articles in unicompartmental knee arthroplasty outcomes and techniques across all publications each year (not limited to Nature Index journals).

Technical terms

Unicompartmental knee arthroplasty (UKA): Replacement of one compartment of the knee joint while preserving other structures.

Robotic arm-assisted surgery: Computer-guided, haptic-controlled system for precise bone resection and implant positioning.

Inter-prosthesis pressure: Force measured between tibial and femoral components at specific knee angles.

Hip–knee–ankle angle (HKAA): Radiographic measure of lower limb mechanical alignment.

Posterior tibial slope (PTS): Angle of tibial plateau relative to perpendicular, influencing flexion mechanics.

References

1. Association between surgeon training grade and the risk of revision following unicompartmental knee replacement: An analysis of National Joint Registry data. PLOS Medicine (2024).
2. Robotic arm-assisted unicondylar knee arthroplasty resulted in superior radiological accuracy: a propensity score-matched analysis. Arthroplasty (2023).
3. Intraoperative sensor technology quantifies inter-prosthesis pressure for predicting lower limb alignment after Oxford unicompartmental knee arthroplasty. Frontiers in Bioengineering and Biotechnology (2023).
4. Cost-effectiveness of unicompartmental compared with total knee replacement: a population-based study using data from the National Joint Registry for England and Wales. BMJ Open (2018).
5. Long-term outcomes of over 8,000 medial Oxford Phase 3 Unicompartmental Knees—a systematic review. Acta Orthopaedica (2017).
6. Ten‐year patient‐reported outcomes following total and minimally invasive unicompartmental knee arthroplasty: a propensity score‐matched cohort analysis. Knee Surgery, Sports Traumatology, Arthroscopy (2016).