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Postoperative Guide

Recovering from Knee Surgery

Recovery begins before the operation. Understanding each phase is decisive for the clinical outcome and for the return to activity.

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Day 0Mobilisation begins
4–6 wksDriving (right knee)
6–12 wksIndependence in daily activities
6–12 monthsFull recovery
Clinical Protocol

Phases of Recovery

Every procedure has its own pace. The phases below apply to most knee surgeries — your surgeon will adapt the protocol to your specific situation.

Phase 1
Days 0 – 5 · Inpatient stay

Acute Phase — Pain Control and Early Mobilisation

Recovery begins in the operating theatre. Mobilisation is started on the day of surgery itself or the following day — this principle is non-negotiable in modern knee surgery.

  • Getting up and assisted walking within the first 24h
  • Multimodal analgesia guided by the anaesthetist
  • Cryotherapy with compression — essential in the first 2 weeks
  • Quadriceps activation exercises (isometric contractions)
  • Nutritional monitoring — protein and hydration are priorities
Milestone: active knee extension without deficit
Phase 2
Weeks 1 – 2 · At home

Transition Phase — Basic Independence

After discharge, the work moves home. Outpatient physiotherapy begins in the first week. The aim is to recover range of movement and reduce swelling.

  • Outpatient physiotherapy — starts in week 1
  • Crutches or a walking frame as advised by the physiotherapist
  • Limb elevation and ice application (15–20 min, 4×/day)
  • A diet rich in protein, fibre and antioxidants
  • Avoid pro-inflammatory foods (refined sugar, saturated fats)
Milestone: independent walking at home
Phase 3
Weeks 2 – 6 · Intermediate rehabilitation

Intermediate Phase — Strength and Mobility

The focus shifts to recovering muscle strength and joint range. The quadriceps is the main target — its recovery is decisive for the long-term outcome.

  • Intensive physiotherapy: progressive strengthening
  • Resistance exercises introduced gradually
  • Specific extension work — early detection of arthrogenic inhibition (AMI)
  • Body-weight control to reduce joint load
  • A diet rich in protein to support muscle recovery
Milestone: full extension and flexion without pain
Phase 4
Weeks 6 – 12 · Advanced recovery

Advanced Phase — Functional Restoration

From 6 weeks onwards, the aim is to restore full function and progressively reintegrate activities. Most patients are independent in daily activities at this stage.

  • Intensive physiotherapy — joint mobility and stability
  • Specific exercises: controlled flexion and extension
  • Progressive return to low-impact activities
  • Nutritional consultations to monitor progress
  • Clinical assessment of return to driving (4–6 wks for the right knee)
Milestone: full independence in daily activities
Phase 5
Months 3 – 12 · Long-term recovery

Maintenance Phase — Lasting Joint Health

Recovery continues for months after surgery. Keeping the knee healthy and preventing complications requires an active lifestyle and regular follow-up.

  • Regular low- to moderate-impact exercise (swimming, cycling, walking)
  • A diet rich in antioxidants and essential nutrients
  • Weight control to reduce chronic joint load
  • Follow-up appointments for imaging monitoring
  • Avoid high-impact activities as clinically advised
Milestone: return to sport or professional activity
Return Milestones

When Can I Resume My Activities?

These timeframes are general guidance. Your surgeon will determine the exact timing based on your clinical progress.

Walking without support

3–4 weeks

Most patients walk without aids within the first 3–4 weeks after a total knee replacement.

Driving

4–6 weeks

Right knee: depends on the ability to brake safely without reaction delay.

Sedentary work

2–4 weeks

Desk work is possible sooner; physically demanding work may require 2–3 months.

Cycling / swimming

6–10 weeks

Low-impact activities are reintroduced progressively after clinical assessment.

Golf / dancing

3–4 months

Recreational moderate-impact activities — after strength and balance have recovered.

Team sport

6–12 months

ACL and complex surgeries: return to impact sport once strength and functional criteria have been validated.

Recovery Begins Before Surgery

The concept of prehabilitation — preoperative preparation — has growing evidence in the outcome of knee surgery. Arriving at surgery in better physical and neuromotor condition significantly reduces recovery time.

Physical Preparation

  • Learning to contract the quadriceps correctly
  • Isometric strengthening exercises
  • Assessing and treating pre-existing arthrogenic inhibition
  • Maintaining joint mobility

General Preparation

  • Smoking cessation — reduces the risk of complications
  • Body-weight control
  • Optimising diabetes, hypertension, anticoagulation
  • Arranging home support for the postoperative period
Frequently Asked Questions

Most common questions

For most arthroscopies, surgery is performed as a day case or with one overnight stay. For a total knee replacement, the typical hospital stay is 1–2 days, and may be shorter in selected patients with excellent home support.
It depends on the procedure: simple arthroscopy 2–6 weeks; ACL reconstruction 6–9 months; total knee replacement 6–12 months. Physiotherapy and early quadriceps activation are the most decisive individual factors.
Mobilisation begins on the day of surgery itself or the following day. Formal structured physiotherapy generally begins in the first week after hospital discharge.
Generally 4 to 6 weeks after surgery on the right lower limb. The clinical criterion is not time — it is the ability to brake in an emergency without pain or reaction delay. Your surgeon will assess this at the follow-up appointment.
AMI is a neurological phenomenon in which the quadriceps cannot contract effectively after a knee injury or surgery — not because of muscle weakness, but because of reflex nerve inhibition. It is recognised and classified by the team of Prof. Sonnery-Cottet (Lyon) and may require specific rehabilitation protocols, in selected cases even delaying surgery.
A diet rich in protein is essential for muscle recovery. Include fruit, vegetables and wholegrains. Avoid pro-inflammatory foods such as refined sugar and saturated fats. Consult a dietitian for a personalised plan.
NC

Dr. Nuno Camelo Barbosa

Orthopaedic Surgeon · Knee Subspecialist
Hospital Lusíadas Porto · Hospital Misericórdia Vila do Conde · Paços de Ferreira

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Every surgery is different. Book an appointment to discuss your personalised recovery protocol.

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