Related Experiment Video
Updated: Jul 3, 2026
09:51
The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
Minimal invasive and computer assisted total knee replacement compared with the conventional technique: a
C Lüring1, J Beckmann, P Haiböck
1Department of Orthopaedic Surgery, University of Regensburg, Kaiser-Karl-V. Allee 3, 93077 Regensburg, Germany. c_luering@yahoo.de
Summary
Minimal invasive surgery (MIS) in total knee replacement (TKR) did not show faster early rehabilitation compared to the standard approach. However, computer-assisted surgery (CAS) with MIS improved leg alignment accuracy in TKR patients.
Area of Science:
- Orthopedic Surgery
- Surgical Technology
Background:
- Minimal invasive surgery (MIS) is increasingly favored for total knee replacement (TKR), with computer-assisted surgery (CAS) proposed to enhance precision.
- Patient demand and industry interest drive the adoption of MIS in TKR.
Purpose of the Study:
- To evaluate if MIS in TKR accelerates early rehabilitation compared to the standard approach.
- To determine if CAS-MIS in TKR improves implant positioning accuracy over freehand MIS and standard techniques.
Main Methods:
- A prospective, randomized short-term trial involving 90 TKR patients.
- Three groups were compared: conventional TKR, MIS-TKR without navigation, and CAS-MIS TKR.
- Outcomes assessed included incision length, Knee Society Score, WOMAC Score, and postoperative mechanical leg axis deviation.
Main Results:
- Incision length was significantly shorter in MIS and CAS-MIS groups compared to conventional TKR (P < 0.01).
- Knee Society and WOMAC Scores showed no significant differences between groups at 1, 6, or 12 weeks.
- Postoperative mechanical leg axis deviation was significantly better in the CAS-MIS group than in the conventional and MIS groups (P < 0.05).
Conclusions:
- The early rehabilitation benefits of MIS in TKR remain unproven compared to the conventional approach.
- CAS significantly improves the accuracy of leg alignment and component orientation in TKR.
- While MIS did not enhance early recovery scores, CAS-MIS offers superior accuracy in TKR procedures.