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What prehab is, and what it is not
Prehab is a short, focused period of preparation before an operation. For hip or knee replacement, it usually combines strengthening, gentle conditioning, mobility work, practice with recovery tasks, and education. It may be supervised by a physical therapist, completed at home after instruction, or use both approaches.
Prehab is not a test you must pass, a boot camp, or a promise of a painless recovery. Arthritis may limit what you can do. A useful program respects pain, balance, heart and lung health, and the joint's current range of motion. The right starting point is the safest activity you can perform consistently.
What the evidence actually shows
The evidence is encouraging but not absolute. A 2025 systematic review and meta-analysis of randomized trials found that preoperative exercise was associated with improvements in several measures of pain, function, quality of life, and timed walking before or after hip and knee replacement. A 2023 systematic review prepared through the Agency for Healthcare Research and Quality found low-strength evidence that prehab before total knee replacement may improve strength and shorten the hospital stay, while many other outcomes, especially after total hip replacement, remained uncertain. Differences among programs make it difficult to name one best routine. 2025 exercise meta-analysis · AHRQ systematic review.
The practical conclusion is that prehab can improve readiness and may help early recovery, but it does not guarantee a particular discharge time or long-term result. The 2026 American Physical Therapy Association knee-replacement guideline includes evidence-based recommendations for preoperative and postoperative planning while recognizing that care must be individualized. APTA 2026 guideline.
The five jobs of a useful prehab program
A complete program prepares the whole recovery system, not just the painful joint.
- Strength: Build the quadriceps, gluteal muscles, hips, calves, and arms used for standing and a walker.
- Conditioning: Maintain safe walking, cycling, pool exercise, or another low-impact activity that your joint tolerates.
- Mobility: Preserve knee extension and flexion or comfortable hip motion without forcing an inflamed joint.
- Task practice: Rehearse sit-to-stand transfers, getting into bed, stairs, and the basic exercises used after surgery.
- Planning: Set up support, transportation, medications, equipment, meals, and a clear route through the home.
Exercises often used before joint replacement
Common building blocks include sit-to-stands from a firm chair, quadriceps tightening, straight-leg raises when safe, heel slides, standing hip abduction, bridges, heel raises, ankle pumps, and short walking intervals. Patients may also practice using a walker or cane and learn how to manage a curb or stairs.
The exercise list is not a prescription for every patient. A person with severe balance problems, a recent fall, unstable heart or lung disease, major weakness, or a painful joint that suddenly worsened may need an examination and supervised plan before increasing activity. The American Association of Hip and Knee Surgeons provides patient exercises designed to strengthen muscles before surgery and familiarize patients with movements used afterward. AAHKS exercises before surgery.
A simple four-week framework
If you have about a month, think in phases rather than chasing a fixed number of repetitions.
- Weeks 4 to 3: Establish a safe baseline. Learn the exercises, identify balance limits, and choose a level that does not cause a major next-day flare.
- Week 2: Build consistency. Practice transfers, walking aids, stairs, and the home routine you expect to use after surgery.
- Final week: Maintain rather than exhaust yourself. Confirm equipment, support, transportation, and the first therapy plan.
- Last day: Follow the surgical team's instructions. Do not add a hard workout, new supplement, or unfamiliar exercise.
How hard should prehab feel?
Mild muscular effort is expected. Sharp joint pain, repeated giving way, or a large increase in swelling is a signal to reduce the load and ask for guidance. A practical rule is that the program should leave you able to continue normal activities later that day and should not produce a substantial flare the next morning.
Stop exercising and seek urgent medical care for chest pain, fainting, new severe shortness of breath, stroke symptoms, or a suddenly hot and swollen calf. A new injury, fever, draining wound, or rapidly worsening inability to bear weight also deserves prompt medical evaluation rather than a harder exercise session.
The caregiver can train too
Family Health & Fitness Day is a useful reminder that preparation works better when the household participates. A coach or family member can learn how to steady without pulling, place the walker correctly, clear tripping hazards, organize meals and ice, and recognize when the patient is not safe to walk alone.
The support person should not try to lift a falling adult. The safer plan is to prevent the situation with clear pathways, appropriate equipment, slow transitions, and help from the surgical or therapy team when transfers are not yet secure.
Prehab should prepare surgery, not postpone it indefinitely
When advanced arthritis has not improved with appropriate nonsurgical care and a patient has chosen replacement, the 2023 American College of Rheumatology and AAHKS guideline conditionally recommends against delaying surgery simply to require more physical therapy or other treatments that have already failed. Prehab can fit into the normal scheduling period without becoming another barrier. ACR and AAHKS timing guideline.
If surgery is only days away, the priorities become education, safe task practice, home preparation, and following medical instructions. If surgery is months away, there may be more time to progress strength and conditioning under guidance.
Planning prehab in Hawai‘i
Patients in Honolulu, West O‘ahu, Hilo, Kona, and the neighbor islands do not all have the same access to supervised therapy. A practical plan may combine one in-person assessment with a home program and remote follow-up. The important parts are a clear starting level, safe progression, and agreement about what to do if symptoms change.
See the practice's physical therapy and rehabilitation protocols for the milestone-based approach, and the rapid recovery guide for how preparation connects with anesthesia, surgery, early walking, and recovery at home.
Sources and further reading
- APTA: Physical Therapist Management of Total Knee Arthroplasty, revision 2026
- 2025 systematic review and meta-analysis of preoperative exercise
- AHRQ-supported systematic review of prehabilitation
- AAHKS exercises to prepare for surgery
- 2023 ACR and AAHKS guideline on timing of elective hip or knee replacement
Medically reviewed by Paul Norio Morton, MD, FAAOS, FAAHKS. Last reviewed: . This article is for education only and isn’t a substitute for an exam and personalized advice — schedule a consultation to discuss your situation.