Arthroscopy — How It Works, Benefits & Recovery — Procedure Guide, Recovery & Risks | MyMedicPlus

Arthroscopy is a minimally invasive surgical and diagnostic procedure in which a small fibre-optic camera — the arthroscope — is inserted through a tiny (5–10 mm) skin incision called a portal to visualise the inside of a joint in real time on a high-definition monitor. The technique was pioneered in the 1970s and has largely replaced open joint surgery for the majority of intra-articular conditions. The most commonly treated joints include the knee, shoulder, hip, ankle, elbow, and wrist. Using specialised miniature instruments introduced through additional portals alongside the camera, the surgeon can simultaneously diagnose and treat a wide range of joint pathologies including meniscal tears, rotator cuff tears, cartilage damage, synovitis, ligament reconstruction, and loose body removal. Arthroscopy is performed by orthopaedic and sports medicine surgeons and typically takes 30 minutes to 2 hours depending on the complexity of the procedure. The minimally invasive nature results in significantly less postoperative pain, faster recovery, and a lower wound complication rate than open surgery while providing superior visualisation of joint anatomy. Arthroscopy is a minimally invasive surgical and diagnostic procedure in which a small fibre-optic camera (the arthroscope) is inserted through a tiny skin portal to visualise and treat joint pathology from within. The arthroscope transmits a magnified image to a high-definition monitor, giving the surgeon a detailed view superior to open surgery for structures within confined joint spaces. Arthroscopy is performed by orthopaedic surgeons trained in minimally invasive joint surgery. It was pioneered in Japan in the 1970s and has become the most common orthopaedic surgical procedure globally, with over two million knee arthroscopies performed each year in the United States alone. Major joints amenable to arthroscopy include the knee, shoulder, ankle, hip, wrist, and elbow.

Arthroscopy is indicated when joint pain, swelling, or mechanical symptoms persist after a trial of conservative management and when clinical examination and imaging (X-ray, MRI) suggest an intra-articular cause. Common indications include: meniscal tears causing knee pain, locking, or giving-way; rotator cuff tears causing shoulder pain and weakness; labral tears of the hip or shoulder (Bankart repair, SLAP repair); articular cartilage defects amenable to microfracture, chondroplasty, or cartilage transplantation; synovitis from rheumatoid arthritis or pigmented villonodular synovitis; loose bodies causing joint locking; ankle impingement from osteophytes; and elbow stiffness from capsular contracture. Arthroscopy is also performed as a diagnostic procedure when imaging findings are equivocal and the cause of joint pain remains uncertain after non-invasive workup. Patient fitness for anaesthesia, skin infection overlying the joint, and coagulopathy are contraindications to consider before proceeding.

Arthroscopy is performed under general or regional anaesthesia depending on the joint and planned procedure. The patient is positioned appropriately for the target joint — supine with a leg holder for the knee, beach chair or lateral decubitus for the shoulder, lateral for the hip. The skin is marked, prepared, and draped in a sterile fashion. A tourniquet is applied for lower limb procedures. A small portal incision is made, and a blunt trocar is inserted into the joint. Saline irrigation fluid is pumped into the joint to distend it and maintain clear vision. The arthroscope is inserted and connected to a camera, light source, and recorder. The surgeon performs a systematic inspection of all compartments. Additional portals (typically 2–3 total) are created to introduce working instruments such as shavers, graspers, radiofrequency probes, suture passers, and anchors. Meniscal tears are repaired with bioabsorbable sutures or resected partially. Rotator cuff tears are repaired with knotless anchor fixation. The procedure is completed, portals sutured, and a compressive bandage applied. The total operative time ranges from 30 minutes for diagnostic arthroscopy to 2 hours for complex reconstructions. After confirming adequate field of view, additional working portals are established for instrument insertion. The surgeon systematically examines the joint compartment by compartment before treating identified pathology — meniscal repair or resection, rotator cuff repair, labral repair, cartilage debridement, or loose body removal. Continuous fluid irrigation maintains joint distension and removes blood and tissue debris. At procedure completion, the joint is lavaged, portals closed, and a compressive dressing applied. Total operative time varies from 30 minutes for a diagnostic scope to over 2 hours for complex reconstructive work.

Arthroscopy provides superior visualisation of the joint and the ability to simultaneously treat intra-articular pathology through the same access, avoiding large incisions and prolonged recovery. Meniscal repair achieves 80–85% success rates with preservation of joint-protective fibrocartilage. Rotator cuff repair has 70–90% functional success depending on tear size, chronicity, and patient compliance with rehabilitation. Labral repair in shoulder instability achieves recurrence rates below 10% in non-contact athletes. Hip arthroscopy for femoroacetabular impingement (FAI) improves pain and function in 80% of patients at 2 years. Advantages over open surgery include: day-case discharge, earlier mobilisation, less postoperative pain, smaller scars, lower infection rates (<1% versus 2–5% for open), and faster return to work. MRI of the joint before arthroscopy accurately identifies the pathology in 85–90% of cases, allowing targeted and efficient surgical planning.

Arthroscopy is among the safest surgical procedures, but complications are not absent. Infection (septic arthritis) occurs in less than 1% and requires urgent joint washout. Nerve injury is rare but can affect the infrapatellar branch of the saphenous nerve at the knee (causing numbness) or the axillary nerve at the shoulder. Deep vein thrombosis occurs in less than 0.5% with appropriate prophylaxis. Portal site haematoma or swelling is common but resolves spontaneously in 2–4 weeks. Instrument breakage is a rare intraoperative event. Stiffness (arthrofibrosis) may develop in 1–3% of knee arthroscopies, particularly after concurrent cruciate ligament surgery, and is treated with intensive physiotherapy or revision arthroscopic release. Incomplete treatment of the underlying pathology can result in persistent symptoms requiring revision surgery. In diagnostic arthroscopy, the finding is occasionally a 'normal arthroscopy' — no intra-articular pathology — particularly in chronic pain presentations where the diagnosis should be reconsidered. Overall, arthroscopy carries far fewer complications than open joint surgery.

Most patients are discharged the same day as their arthroscopy, typically within 2–4 hours of the procedure. Ice, limb elevation, and regular analgesia (paracetamol and an NSAID) manage postoperative swelling and pain for the first 3–5 days. Portal sites heal within 7–10 days and sutures are removed at the first outpatient review. The pace of rehabilitation depends entirely on the procedure performed: diagnostic arthroscopy or simple washout allows return to light activities within 5–7 days; meniscal repair requires 6–8 weeks non-weight-bearing followed by progressive rehabilitation for 3–4 months; rotator cuff repair requires a sling for 4–6 weeks and physiotherapy for 4–6 months before return to overhead activity. Sports restrictions are procedure-dependent, ranging from 4–6 weeks for partial meniscectomy to 6–9 months for complex ligament reconstruction. Physiotherapy is essential after all therapeutic arthroscopic procedures to restore range of motion, muscular strength, and neuromuscular control before return to sport or physical work.