Patient question

My knee locked during a squat at the gym. What happened?

Dr. Pablo GelberOrthopaedic Knee Surgeon

Quick answer

A knee that suddenly catches or jams at the bottom of a heavy squat or lunge most often has a torn meniscus, pinched where load and deep bending meet. If it frees up, change your training and get it checked; if it stays stuck, see a surgeon promptly, advises Dr. Pablo Gelber, knee surgeon at Aman Hospital in Doha.

Why the bottom of the squat is the danger zone

At deep bend the rear of the meniscus carries a lot of load. Add weight on the bar, a slight inward collapse of the knee or a twist as you drive up, and a meniscus that is already worn or has a small tear can split further or flip. The result is a sharp pain on the inner or outer side and the knee stalling, sometimes with a pop.

Other gym-related causes of catching are a flap of joint cartilage, a kneecap that is irritated by heavy loading, and less commonly a loose fragment.

What to do after the session

Stop loading the knee for the rest of the session
Ice for 15 to 20 minutes and rest it raised if it swells
Check whether it straightens fully and bends as far as the other knee
Walk normally if you can; use crutches if you cannot
If it is stuck and will not straighten, do not force it; arrange urgent review

Training while you wait for assessment

Avoid deep squats, lunges, leg press below 90 degrees and jumping
Keep training upper body and core
Cycling, swimming and straight-leg exercises usually remain comfortable
Avoid twisting under load; when you return, rebuild depth and weight gradually
Indoor gyms in Doha make it easy to train hard in any season, so plan rest days deliberately

When to see a knee surgeon in Doha

See a specialist if the knee swells, catches again or does not move fully within a few days, or straight away if it is locked. At Aman Hospital, Dr. Gelber examines the meniscus and ligaments and often arranges an MRI. Some tears settle with a structured programme, especially degenerative tears in older lifters. A tear that keeps catching or locking, particularly in a younger athlete, is often treated with keyhole surgery to repair it, which protects the knee for future training.

Frequently asked questions

Is squatting bad for knees?

No. Well-performed squats strengthen the muscles that protect the knee. Problems come from sudden increases in load, poor control or training through warning signs such as catching and swelling.

How long before I can squat again after a meniscus repair?

Deep loaded squats are usually avoided for several months after repair, with a gradual return guided by your surgeon and physiotherapist. After trimming a tear, return is generally quicker.