Low-Impact Exercises for Knee, Hip, and Spine Surgery Recovery

For patients recovering from knee replacement, hip replacement, or lumbar spine surgery, early movement is a cornerstone of the healing process. 

Physical therapists guide patients through their first exercises within 24 hours of most major orthopedic procedures. Controlled, low-impact movement helps minimize stiffness and excessive scar-related restriction.

This article covers the low-impact exercises most commonly used in recovery from these three procedures, along with general timeline guidance for each. It is intended as educational information, not a substitute for the individualized care plan your surgeon and physical therapist will develop for your specific situation. 

Every recovery is different, and your care team’s guidance takes precedence over any general framework.

What “Low-Impact” Actually Means in Recovery

Low-impact exercise minimizes stress on healing joints and soft tissue, but it is not a blanket clearance to move however it feels comfortable. The phrase describes a quality of movement, not a level of intensity.

Low-impact exercise refers to movement that minimizes joint loading and repetitive impact forces, often through controlled motion, continuous ground contact, or body-weight support from water or equipment. Examples include walking, stationary cycling, and aquatic therapy.

Understanding these distinctions helps you set realistic expectations for which exercises will be appropriate at each stage of your recovery.

Low-Impact Exercises After Knee Replacement

According to the American Academy of Orthopedic Surgeons (AAOS), the first exercises after total knee replacement typically begin on the day of surgery, while the patient is still under clinical supervision. 

These early exercises focus on circulation and gentle movement:

• Quadriceps sets (tightening the thigh muscle without moving the leg)
• Straight leg raises
• Ankle pumps and ankle circles
• Knee straightening exercises
• Bed-supported knee bends

The AAOS recommends exercising for 20-30 minutes daily, or up to 2-3 times per day, during early recovery, with walking sessions building toward 30 minutes, 2-3 times per day, as tolerated.

Around weeks 4-6, most patients transition to more active exercises once cleared by their care team. 

Stationary cycling is introduced during this phase, along with resistance work with ankle weights. Low-impact cardiovascular activities such as walking, swimming, and cycling are generally resumed within 3-6 months of surgery, depending on individual progress.

Two clinical milestones often used to track knee recovery involve range-of-motion targets. 

Some patients reach approximately 90º by 7 days, 120º by 3 weeks, and 135º by week 8.

These are common checkpoints, not guarantees. Individual timelines vary depending on a patient’s baseline fitness, surgical approach, and the consistency with which they engage with their rehabilitation program. 

Range of motion typically continues to improve for up to a year following surgery.

Low-Impact Exercises After Hip Replacement

Hip replacement recovery begins quickly. According to The Cleveland Clinic, most patients start PT-guided exercise within 24 hours of surgery. 

The early goal is to restore circulation, maintain the range of motion, and activate the muscles that stabilize the new joint.

The AAOS outlines a typical exercise progression for total hip replacement:

Early phase (first days post-surgery, bed and seated):

• Ankle pumps and ankle rotations
• Buttock contractions
• Bed-supported knee bends
• Hip abduction exercises (sliding the leg outward while lying flat, do not cross your legs)
• Quadriceps sets, and straight leg raises

Standing phase (as stability allows, typically within the first week or two):

• Standing knee raises
• Standing hip abduction (lifting the leg to the side while supported at a countertop)
• Standing hip extensions

Advanced phase (as recovery progresses):

• Elastic resistance exercises targeting the hip
• Stationary cycling
• Progressive walking, increasing duration over time

For long-term maintenance, the AAOS recommends 20-30 minutes of exercise 3-4 times per week. 

Many patients begin returning to more normal movement patterns within 6-12 weeks, though restrictions vary by surgical approach and surgeon guidance.

Hip precautions during the first six to eight weeks are not optional. These guidelines exist to prevent dislocation of the new hip joint.

The AAOS specifies the following restrictions during early recovery:

• Do not cross your legs at the knees
• Do not bend the hip past 90º (this includes sitting in deep chairs or low seats, or leaning forward while seated)
• Do not raise the knee above hip level
• Do not twist the foot sharply inward or outward while bending
• Do not lean forward from a seated position to pick up objects from the floor

Mild-to-moderate swelling around the hip is common and may persist for 3-6 months. 

Significant or sudden increases in swelling should be reported to your surgeon.

Low-Impact Exercises After Spine Surgery

Spine surgery recovery timelines vary more than joint replacement recovery because the appropriate starting point depends on the procedure performed. 

But one finding holds consistently across procedure types: patients who walk regularly from the earliest stages of recovery tend to do significantly better at one year than those who do not.

A 2025 narrative review published in the North American Spine Society Journal found that patients walking more than 3,500 steps per day at 6 weeks post-surgery were approximately four times more likely to achieve an excellent outcome at one year. 

The AAOS recommends a structured, progressive exercise approach for patients recovering from low back surgery:

Initial phase: Low-impact aerobic activity such as walking on a treadmill or using a stationary bike, 20-30 minutes per session.

Early phase: Ankle pumps, heel slides, abdominal contractions (gentle core activation), and heel raises. Exercises such as countertop squats require specific surgeon approval before attempting.

Intermediate phase: Knee-to-chest stretches and seated hamstring stretches to restore flexibility.

Advanced phase (PT-supervised): Hip flexor stretches, diagonal hip stretches, and lumbar stabilization exercises using progressive resistance.

In early recovery, the AAOS recommends exercising 10-30 minutes, 1-3 times daily. 

Aquatic therapy is a valuable option for spine recovery once the incision is fully healed and the surgeon has given clearance. 

Water buoyancy reduces the load on the spine while allowing meaningful strength and movement work.

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