Exercises for Knee Replacement Recovery: A Week by Week Plan

The new knee you walk away with at a year is mostly built by the exercises you do at home, not by the hour or two on the operating table. Surgeons resurface the joint; the bending, straightening, and strengthening you repeat every day decide how far it moves and how little it hurts. That order surprised me when I had mine done, and it is the single most useful thing to understand before you start.

This is a staged plan, from the first day through about three months, with the movements that matter most at each point. Numbers here are general ranges from the international literature and should be confirmed with your own surgeon, who knows your knee, your bone, and your operation.

Why exercise, not rest, drives recovery

Movement is the treatment, and a knee left to rest stiffens fast. Exercise is the most strongly supported step in knee care generally, with pain and function benefits comparable in size to many drugs and far fewer harms ¹. After a replacement, that principle becomes more urgent: scar tissue forms in the early weeks, and a joint that is not moved through its range can lock in stiffness that is difficult to recover later. International guidance puts exercise and self-management at the core of knee care for this reason ².

Knee osteoarthritis, the reason most people reach surgery, is the joint disease most likely to disable worldwide, and it is more common and often more severe in women after about age 50 ³. By the time you reach replacement, the muscles around that knee have usually weakened from months or years of guarding it. Rehab is partly rebuilding what the arthritis took.

The two targets that matter most

Aim for a knee that goes fully straight and bends well past 90 degrees. The working goal is roughly 0 degrees of extension (dead straight) to about 115 to 120 degrees of bend. Extension is the one people neglect and regret: a knee that will not straighten gives a persistent limp and aching, and it is far harder to regain weeks later than to protect early. Bend is what you need for real life, stairs, low chairs, and the footwell of a car.

Two exercises anchor these goals. For extension, sit with the heel propped on a rolled towel so the knee hangs unsupported and let gravity pull it straight, holding several minutes at a time. For flexion, sit on a firm chair and slide the foot back under you, or use the heel-slide lying down, easing the knee to its comfortable limit and holding. Measured progress in degrees, even one or two a week, is the thing to chase.

Days 1 to 7: gentle and frequent

Start the same day or the next day, in short sessions many times a day. Walking with aids usually begins the same day or next day, and the first exercises go alongside it. The early set is undramatic on purpose: ankle pumps (flexing the foot up and down) to keep blood moving, static quad sets (pressing the back of the knee down to tighten the thigh), gentle heel slides, and short assisted walks. Ankle pumps also matter for safety, because they help keep blood flowing in the calf during the period when clots are the headline early risk.

This week is about frequency, not effort. Five to ten minutes every couple of hours beats one long session. Ice and elevate after each round; swelling is the main thing limiting your bend, and controlling it pays back directly in range. Expect the knee to be warm, swollen, and stubborn. That is the normal starting line, not a setback.

Weeks 2 to 6: range and weight-bearing

Push range of motion and begin loading the leg. This is the window where range improves fastest, so it earns the most attention. Keep the extension and flexion drills daily, and add standing exercises as balance allows: mini squats holding a counter, step-ups on a low step, sit-to-stands from a firm chair (a direct rehearsal of getting out of any seat). Most people are off walking aids by around 4 to 6 weeks, moving walker to cane to nothing as steadiness allows, and driving typically resumes around the same point once control is safe.

For women specifically, build the hip and core alongside the knee. Standing hip abduction (lifting the leg out to the side) and glute bridges strengthen the muscles that keep the knee tracking straight, which reduces strain on the new joint during walking and stairs. This matters because differences in pelvis width and knee alignment are among the plausible reasons knee OA hits women harder, and a stronger hip helps compensate.

Weeks 6 to 12: strength and stamina

Shift from regaining movement to rebuilding strength and endurance. By now range should be close to target and the focus turns to making the leg dependable: longer walks, a stationary bike (excellent for combining bend and gentle strength), resistance work on the quads and hamstrings, and balance exercises like single-leg stands. Functional recovery to most daily activities is common by about 3 months, though full recovery and the final outcome can take up to a year.

If you have not already, this is a sensible point to confirm a bone-health plan. Osteoporosis is more common in women after 50, the DEXA (DXA) scan is the standard bone-density test, and knowing your bone status shapes how hard and how soon to load the leg ⁴. Strengthening exercise is good for bone as well as muscle, so the two goals pull in the same direction.

What normal recovery feels like

Slow, uneven, and longer than you expect. Some swelling, warmth, and stiffness for months is normal, and progress arrives in small weekly increments rather than clear jumps. The honest part nobody enjoys: it is repetitive, and the motivation to do the boring drills on a stiff, sore knee is the real test. Hold onto the order of things. The exercises are not preparation for recovery. They are the recovery.

Watch for the exceptions to push past: sharp pain, a sudden jump in swelling or heat, redness that worsens, or calf pain and swelling, all of which warrant a call to your team rather than another set of reps.

This article is general information, not medical advice. Recovery and exercise after knee replacement should be guided by your own surgeon and physiotherapist, who know your knee and your operation. See a qualified clinician for advice about your situation.