ACL and Ligament Injuries: Surgery or Physiotherapy?

A twist on the football field, a pop, and the knee swells up within hours. These are classic signs of an ACL injury. The first question most people ask is: "Do I need surgery?"

The honest answer is: it depends on you.

What the ACL does

The anterior cruciate ligament runs through the middle of the knee and stops the shin bone sliding forward and rotating too much. It's most important in sports with cutting, pivoting and jumping, like football, cricket fielding, basketball and kabaddi.

Other knee ligaments

• MCL (inner knee): most MCL sprains heal well without surgery, using a brace and physiotherapy.
• LCL (outer knee) and PCL (back of the knee): many are managed without surgery, but some need repair, especially when combined with other injuries.

Option 1: Surgery (ACL reconstruction) plus rehabilitation

Usually considered if you:

• Want to return to pivoting or contact sport
• Have a knee that keeps giving way in daily life despite rehab
• Have other damage, such as some meniscus tears, that also needs fixing

After surgery, rehabilitation typically takes 9 to 12 months before returning to competitive sport.

Option 2: Rehabilitation without surgery

Studies have shown that some people, especially those who don't play pivoting sports, do well with a structured rehabilitation programme alone. Some of them still go on to have surgery later if the knee stays unstable.

This option may suit you if you:

• Play straight-line sports (running, cycling) or are less active
• Don't have repeated giving way
• Are willing to commit to a structured strengthening programme

What doesn't change: you need rehab either way

Surgery replaces the ligament, but it doesn't rebuild your thigh strength, balance or confidence. The quality of your rehabilitation largely decides the outcome.

Early steps after a ligament injury

1. Calm the swelling: relative rest, ice, compression and elevation.
2. Get the knee fully straight as early as possible. Losing the last few degrees of straightening is hard to recover later.
3. Start gentle thigh muscle activation.
4. Get an assessment to confirm which structures are injured.

Making the decision

Talk it through with an orthopaedic surgeon and a physiotherapist. Consider your sport, job, age, goals and how the knee behaves after a few weeks of rehab. There isn't one right answer for everyone.