Condition

Knee Pain and ACL Treatment in Central London

Physiotherapy for runner's knee, ACL injuries and other knee pain, built on progressive strength work and objective testing, so you return to running and sport with evidence the knee is ready.

Knee Pain (ACL & Runner's Knee)

Understanding knee pain

Knee pain covers several different problems, and they need different plans. Runner's knee, or patellofemoral pain, is an ache around or behind the kneecap, often worse on stairs, when squatting or after sitting. It is usually a load problem, and it tends to respond well to strengthening the hip and thigh muscles while training volume is adjusted.

An anterior cruciate ligament (ACL) injury typically happens when the knee twists on a planted foot, often with a pop and fast swelling. Whether or not you have surgery, the rehabilitation is long and structured, and rebuilding strength and control to match the other leg is what matters most.

Carly assesses which problem you have, then treats it through physiotherapy and sports injury rehab. Performance testing compares one leg with the other so return-to-sport decisions rest on numbers.

Physiotherapy for knee pain can help you to:

Find out what is actually wrong with my knee

Runner's knee, a ligament injury, a meniscal tear and joint wear can all show up as a sore knee. Working out which one you have shapes everything that follows.

Keep running while it settles

Complete rest often lowers the capacity you need to rebuild. Distance, surface and frequency are adjusted so you keep running at a level the knee tolerates while strength comes back.

Trust my knee again after an ACL injury

A structured programme, before and after surgery or instead of it, that rebuilds strength and control in stages until the knee feels stable on landing, cutting and turning.

Go up and down stairs without pain

Targeted strength work for the thigh and hip muscles reduces the load on the front of the knee, which is often what makes stairs, squats and kneeling easier.

Know when I am ready to go back to sport

Retesting against the other leg and your own baseline gives a measured answer to the readiness question, so you return with evidence rather than a feeling.

What causes knee pain and runner's knee?

  • A rapid increase in running distance, speed or hill work that outpaces what the knee can handle

  • Weakness in the quadriceps and hip muscles, changing how the kneecap is loaded

  • A twisting or pivoting movement on a planted foot, the usual way an ACL is injured

  • A twisting load that damages a meniscus, the cartilage cushion inside the knee

  • Contact, collisions and sudden changes of direction in sports such as roller derby or football

  • Long periods of sitting with the knees bent, a common trigger for pain around the kneecap

Carly Christensen courtside with England Women’s Roller Derby at the 2025 World Cup in Innsbruck

What happens at your first assessment?

Your first session is a full hour with Carly. She takes your history, asks what you need to get back to, then screens how you move, how strong you are and what the problem area is doing under load.

You leave with a working diagnosis in plain English, the first steps of your plan, and a clear idea of how progress will be measured.

Book an assessment
Carly Christensen trackside with Cadillac Hertz Team Jota crew at the Qatar round of the 2025 World Endurance Championship

Fees and booking

Sessions are £150 per hour, by appointment at UNTIL Marylebone, Canary Wharf or Soho. You can refer yourself; no GP letter is needed.

  • Assessment and treatment: £150 for 60 minutes
  • Self-referral: no GP referral needed if you are paying yourself
  • Sessions at UNTIL Marylebone, UNTIL Canary Wharf and UNTIL Soho
  • Book by phone on 07719 662005 or by email
Book an assessment

How it works,
from first assessment to full output

A clear path from first assessment to being back at full output, measured, not guessed. Every session is one hour with Carly, at UNTIL Marylebone, Canary Wharf or Soho.

Carly Christensen in the treatment room at the Roller Derby World Cup 2025 in Innsbruck, with an athlete on the plinth

Assess

Physical screening and performance testing to find what is limiting you. Carly takes a full history, examines how you move and load, and measures where it matters, so the plan starts from numbers rather than guesswork.

Carly Christensen in Cadillac Hertz Team Jota team kit with headset

Plan

A programme built around your goals, your sport and your calendar. You leave knowing what is driving the problem, what you are going to do about it, and how progress will be measured from one session to the next.

Carly Christensen on the grid beside the Cadillac Hertz Team Jota car at the Qatar round of the 2025 World Endurance Championship

Build

Coached sessions and progressive loading, adjusted as you improve. Strength, control and conditioning are built in stages, with the load moved on only when the last stage has been earned.

Carly Christensen celebrating with an England skater at the Roller Derby World Cup 2025

Return

Back to sport and racing, with objective measures to prove it. The decision to return rests on retesting against your own baseline, so you go back with evidence rather than a feeling.

Knee pain and ACL
questions

What is runner's knee?

Runner's knee usually means patellofemoral pain: an ache around or behind the kneecap, often worse on stairs, squatting or after sitting for a long time. It is generally a load problem and tends to respond well to progressive strengthening of the thigh and hip muscles.

How long does ACL rehab take?

Commonly nine months or more before a return to sports that involve pivoting and cutting, whether or not you have surgery. Walking and daily tasks come back much sooner. At Box Box, progression is based on measured strength and control rather than the calendar alone.

When does a knee injury need urgent care?

Go to an urgent treatment centre or A&E if you heard a snap, pop or crack when you hurt your knee, it is very painful or swollen, you cannot put weight on it, it has changed shape, or your lower leg feels numb, tingly or cold.

Can Carly help before and after ACL surgery?

Yes. Rehab before surgery helps settle swelling and restore movement and strength, which can make recovery afterwards smoother. After the operation, Carly follows your surgeon's protocol in the early stages, then builds strength, control and sport-specific work towards a tested return to play.

Ready when
you are.

Box Box Physiotherapy and Performance • UNTIL Soho, 111 Charing Cross Road, London WC2H 0DT

Book an assessment

Based in central London, by appointment. Sessions at UNTIL Marylebone, Canary Wharf and Soho.