Stronger Before Surgery: How Strength Training Can Improve Your Knee Replacement Outcome
"Preoperative strength training can significantly improve postural control and speed up recovery after total knee arthroplasty (TKA)."
Knee osteoarthritis (OA) is a common issue that leads to pain and limited movement, especially as people get older. Total knee arthroplasty (TKA), or knee replacement surgery, is often the solution. But what if you could go into surgery stronger and better prepared? Research suggests that focusing on strength training before surgery can make a significant difference in your recovery and overall results.
Typically, recovery after TKA involves physical therapy aimed at restoring movement and strength. However, a recent study investigated whether a high-intensity strength training program before surgery could improve postural control—your body's ability to maintain balance—both before and after the procedure.
This article will break down the study's findings, explaining how pre-operative strength training, with a focus on lower limb strength, not only enhances postural control but also contributes to a speedier and more effective recovery after TKA. Let's explore the power of preparation!
Knee Replacement and Rehabilitation
Total knee arthroplasty (TKA), or total knee replacement, is an elective procedure for pain and dysfunction from an arthritic knee joint. For advanced knee osteoarthritis, one review describes TKA as the gold-standard treatment; most patients report less pain and successful long-term results, though recovery remains part of the postoperative course. Postoperative rehabilitation guidelines aim to help people return to activities as quickly and safely as possible, with modifications based on physician instructions and other procedures. Prehabilitation is described as a newer approach to preoperative care, and a 2025 systematic review and meta-analysis examined its effectiveness for TKA recovery.
Recovery Milestones and Changing Care
A 2026 rehabilitation guide reports that enhanced recovery protocols can enable TKA patients to go home in 1–3 days rather than staying about a week. It describes the subsequent 12 weeks of rehabilitation as an important period for recovery. Patient-facing resources now organize recovery around milestones, such as moving beyond a walker, and offer week-by-week timelines with range-of-motion goals, exercises, and expectations. These sources present contemporary ways of framing recovery, rather than documenting the historical development of knee replacement.
The Power of Pre-Surgery Strength: What the Research Shows
The study, published in Knee Surgery, Sports Traumatology, Arthroscopy, involved 44 participants scheduled for TKA due to osteoarthritis. The key was to assess postural control through Romberg tests (standing balance tests with eyes open and closed) at four points: before training, after 8 weeks of training, one month after TKA, and three months after TKA. The group that underwent an 8-week high-intensity strength training program prior to surgery showed remarkable improvements compared to the control group that received no intervention.
- Improved Balance: Participants demonstrated better balance, indicated by a lower Center of Pressure area (COP), at all follow-up points (T2, T3, and T4).
- Enhanced Stability: They exhibited reduced sway in both anteroposterior and medial-lateral directions.
- Faster Recovery: The training benefits extended beyond the surgery, contributing to quicker postural control recovery.
Strength, Function, and Prehabilitation Evidence
A 2025 meta-analysis of randomized trials in knee osteoarthritis found that high-intensity exercise improved knee-flexion strength (SMD 0.39; 95% CI 0.08–0.70), leg-press strength (SMD 0.47; 95% CI 0.23–0.70), KOOS symptoms (SMD 0.18; 95% CI 0.02–0.35), and KOOS quality of life (SMD 0.29; 95% CI 0.13–0.45) compared with control. A scoping review of prehabilitation before hip and knee arthroplasty found that performance-based outcomes—most often muscle strength—were collected in 66% of trials (61 trials), using 47 different tools. A separate randomized trial snippet reports that its results were consistent with prior findings that early high-intensity rehabilitation produced greater quadriceps strength and joint mobility than low-intensity rehabilitation. Together, these sources cover exercise effects and how prehabilitation outcomes have been measured, but they do not establish a single standardized outcome tool.
Comparing Rehabilitation Timing and Methods
A systematic review set out to compare earlier versus later initiation of structured rehabilitation after primary TKA, using the timing definitions found in the available literature and examining functional recovery. The supplied summary does not report which timing produced better outcomes. A 2025 article likewise notes that rehabilitation methods after TKA can affect complication recovery and joint function, while stating that further research is needed to compare methods. The available material therefore identifies timing and method selection as areas of comparison but does not support a specific winner.
Making Strides: The Future of TKA Recovery
The study's conclusion is clear: incorporating high-intensity strength training into pre-operative care can significantly enhance postural control and accelerate recovery following TKA. This approach equips patients with a solid foundation of strength and stability, setting the stage for improved outcomes.
Emerging Directions in Rehabilitation Research
A 2024 review describes post–total knee replacement rehabilitation methods and formats as continually expanding alongside evolving medical concepts and interdisciplinary integration. It argues that mapping research trends and frontier topics can help researchers set directions and extend findings in the field. A separate 2026 article describes same-day discharge, robotic-assisted precision, and rapid-recovery protocols as features of knee replacement care, but the supplied snippet does not provide evidence to quantify their effects. These sources point to ongoing development while leaving the benefits of specific newer approaches to be established.
Prehabilitation and Patient Outcomes
A 2025 study notes that 10–30% of patients report suboptimal outcomes after TKA and says prehabilitation may help people at risk of poorer outcomes, while its effectiveness in this group remains uncertain. A 2022 randomized clinical trial evaluated whether prehabilitation affects functional independence and activity limitations in older adults with knee osteoarthritis after knee replacement. Another 2022 study estimated the effects of exercise-based prehabilitation, compared with no prehabilitation, on knee function before surgery and during the first year after primary unilateral TKA. The supplied summaries describe these research questions but do not report enough results to conclude how much prehabilitation changes patient outcomes.
These findings advocate for a shift in TKA preparation, emphasizing the inclusion of strength training programs. Healthcare providers should consider integrating such programs into their standard pre-operative protocols to optimize patient recovery.
If you or a loved one are considering TKA, talk to your doctor or physical therapist about incorporating a strength training regimen into your pre-operative plan. By taking proactive steps to build strength and stability before surgery, you can improve your chances of a successful and speedy recovery, getting you back on your feet and enjoying life to the fullest!