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Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
Published on: November 9, 2018
Does minimally invasive total knee arthroplasty improve isokinetic torque?
Michael C Liebensteiner1, Martin Krismer, Arnold Koller
1Department of Orthopaedic Surgery, Innsbruck Medical University, Anichstrasse 35, 6020 Innsbruck, Austria. michael.liebensteiner@i-med.ac.at
Clinical Orthopaedics and Related Research
|August 21, 2012
Summary
Minimally invasive surgery total knee arthroplasty (MIS TKA) does not improve postoperative knee strength compared to standard TKA. Quadriceps strength reduction was similar between both surgical approaches, indicating MIS TKA does not enhance recovery.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Rehabilitation science
Background:
- Minimally invasive surgical total knee arthroplasty (MIS TKA) aims for less invasive extensor apparatus dissection.
- Potential benefit of MIS TKA is reduced postoperative quadriceps strength reduction.
- Evidence comparing MIS TKA to standard TKA for knee strength is limited.
Purpose of the Study:
- To compare knee extensor and flexor torque between MIS TKA and standard TKA.
- To evaluate differences in knee scores, alignment, ROM, operative times, and hospital stay.
- To determine if MIS TKA leads to greater knee strength post-surgery.
Main Methods:
- Prospective study of 52 patients undergoing MIS or standard TKA, matched for key demographics.
- Isokinetic testing preoperatively and postoperatively to measure extensor and flexor torque.
- Calculation of postoperative-to-preoperative ratios and extensor-flexor torque ratios.
Main Results:
- Mean baseline extensor torques were similar between MIS (57 Nm) and standard TKA (53 Nm) groups.
- Postoperative extensor torques at 8 weeks were also similar: 47 Nm (MIS) vs. 45 Nm (standard TKA).
- Postoperative-to-preoperative and extensor-flexor torque ratios were comparable across both groups.
Conclusions:
- Less invasive extensor apparatus dissection in MIS TKA does not enhance postoperative quadriceps strength.
- MIS TKA showed no significant advantage over standard TKA in restoring knee extensor strength.
- The findings suggest current MIS TKA techniques do not improve strength recovery outcomes.
