A Day in the OR: A Physio's View on Knee Surgery

Why a physiotherapist spends a day in the operating theatre

Most of our work with a knee happens either side of the operation months of pre-hab before, and a long staged rehab after. The surgery itself is usually a black box: the patient goes in, comes out with three small dressings and an operation report full of abbreviations, and we work backwards from there.

So when an orthopaedic knee surgeon offered a day in theatre, it was worth taking. This is a physiotherapist's perspective on knee surgery \u2014 what the operating room is actually like, what happens during an ACL reconstruction, and, more usefully, how the decisions made in that room change what rehabilitation looks like afterwards.

What the operating room is actually like

The first surprise is how unremarkable it feels. Patients often imagine something tense and clinical. In practice the theatre team has music on, there is conversation between cases, and the atmosphere is calm and businesslike. That calm is the product of repetition \u2014 everyone has a defined role and has done this hundreds of times.

The second surprise is the pace. From the patient being positioned and the limb prepped and draped, through to dressings on, an uncomplicated arthroscopic ACL reconstruction moves quickly. Much of the time is spent on setup, sterile technique and graft preparation rather than on work inside the joint itself.

The third is the choreography. Surgeon, assistant, scrub nurse, scout nurse and anaesthetist each hold a piece of the process, and instruments move between them with very little said out loud. It is a good reminder that a patient's care is a chain of handovers, and that the post-operative physiotherapist is simply the last link in it.

An ACL reconstruction, step by step

Broadly, what we observed followed this sequence:

1. Anaesthesia and block. Depending on the case, general or spinal anaesthesia, often combined with a regional nerve block to manage early post-operative pain. Blocks influence the first day or two of rehab \u2014 sensation and quadriceps activation can be altered while the block wears off.

2. Positioning, prep and tourniquet. The limb is cleaned, draped, and a thigh tourniquet is commonly used.

3. Diagnostic arthroscopy. Two small portals either side of the patellar tendon. The camera goes through the joint systematically: cartilage surfaces, both menisci, the remnant ACL. This is where incidental findings get picked up \u2014 a meniscal tear or a cartilage lesion that wasn't obvious on imaging.

4. Graft harvest and preparation. The graft is taken, then prepared on a back table: trimmed, measured for length and diameter, whipstitched and pre-tensioned. Diameter matters and is recorded in the operation note.

5. Tunnel preparation. Femoral and tibial tunnels are drilled to match the graft, positioned to reproduce the native ACL footprint.

6. Graft passage, tensioning and fixation. The graft is pulled through and fixed \u2014 commonly a suspensory device on the femoral side and an interference screw or similar on the tibial side. The knee is cycled through range to check tension and confirm there is no impingement.

7. Any concurrent procedures, then washout, closure and dressings.

Seeing the anatomy live \u2014 how tight the notch is, how the graft sits, how much the tibia shifts before and after fixation \u2014 makes the operation report far easier to translate for a patient.

Graft choice: the decision that shapes your rehab

One of the more useful conversations of the day was about graft selection. There is no single default; surgeons have preferences, and patient factors drive the discussion. The main options are hamstring tendon, bone-patellar tendon-bone, quadriceps tendon and allograft (donor tissue).

What matters from a rehab point of view is that each option creates a different donor site, and the donor site is often what dictates the early programme:

• Hamstring graft. Semitendinosus with or without gracilis. Rehab typically pays close attention to hamstring strength and to graded reloading of the harvested muscle group, particularly for sports with high sprinting or deceleration demands.

• Bone-patellar tendon-bone. Anterior knee soreness and kneeling irritation are commonly reported afterwards, so kneeling tolerance and extensor mechanism loading tend to feature more heavily.

• Quadriceps tendon. Early quadriceps activation and strength usually need particular attention.

• Allograft. No donor site to rehabilitate, which some patients find appealing. Graft incorporation is generally described as slower than with autograft, and surgeons often set more conservative loading and return-to-sport criteria as a result. Allograft is more often discussed with older or lower-demand patients, and questions about tissue source, graft type and sterilisation processing are reasonable ones to ask.

Age, activity level, sport demands, previous surgery and what the patient wants to get back to all feed into the choice. It is worth having that conversation with your surgeon before the day of surgery, not after.

The other findings that change everything

What is done alongside the ACL often affects rehabilitation more than the ACL work itself.

A meniscal repair commonly comes with restrictions the patient must respect \u2014 limits on weight bearing, limits on knee flexion range, and avoidance of deep loaded flexion or twisting for a defined period set by the surgeon. A partial meniscectomy usually carries fewer early restrictions. A cartilage procedure can carry its own protected loading protocol. A lateral extra-articular tenodesis or similar adjunct adds another healing structure to account for.

This is why two people who both had \"an ACL\" can be given very different programmes. The operation report is not paperwork \u2014 it is the brief.

What realistic recovery looks like

Rehabilitation after ACL reconstruction is a staged process measured in months rather than weeks, and progression is generally guided by criteria rather than by the calendar: restoring full extension, settling swelling, regaining quadriceps strength relative to the other leg, then building through strength, plyometrics, running and sport-specific work. Progress is rarely a straight line, and setbacks such as a swollen knee after a heavy session are common enough to plan for. Your surgeon's protocol and your own testing results set the pace \u2014 not a fixed timeline.

What the day changed

Mostly, it changed how we explain things. Being able to describe where a tunnel sits, why full passive extension is protected early, or why a repaired meniscus limits deep flexion tends to land better than an instruction with no reasoning behind it.

It also reinforced how much of a knee outcome depends on communication between the surgeon and the treating physiotherapist. If you are heading into knee surgery, useful questions to bring to your pre-operative appointment include: which graft, why that graft, what else was found or repaired, what the weight-bearing and range restrictions are, and what criteria need to be met before progressing to the next stage.

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