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Orthopaedic Specialist Surgeons Alliance

Giving Clients Fast Access To Orthopedic Care


Using some of the countries leading consultants to diagnose and prescribe treatment - as quickly and efficiently as possible.


Using state of the art MAKO robotics or traditional surgery, our aim is to reolve your medical needs and reduce recovery time.


Our goal is to move you through your recovery and rehabilitation as efficiently and rapidly as we can to reduce your downtime.

OSSA (Orthopaedic Specialist Surgeons Alliance) brings together Specialist Consultant Orthopaedic Surgeons in Cambridge whose NHS practice is based in at Addenbrookes a large university teaching hospital in Cambridge. Together we offer:

Each consultant has a different area of primary expertise allowing us to offer the best advice and treatment for any particular patient. This means that a patient with a hip or knee problem is looked after by the relevant expert.

We appreciate that orthopaedic problems can cause considerable pain and worry and so we strive to ensure that the patients' experience is as stress free as possible. Our knowledgeable and professional staff will deal with your problems in an understanding and reassuring manner. Your care will be personalised for your particular requirements and all management options explained in an understandable way.

Our patients are assured of friendly, personalised and a professional service.

We are fee assured with the major insurance companies.

Our Surgeons 

Stephen McDonnell

Associate Professor - Consultant Knee & Hip Surgeon Sports and Joints

Mike Barrett

Consultant Foot & Ankle Surgeon Sports and Joints

Graham Tytherleigh-Strong

Consultant Shoulder Surgeon

Arman Memarzadeh

Consultant Knee Surgeon (Sports And Joints)

Phillip Johnston

Consultant Hand and Wrist Surgeon

Christopher Gooding

Consultant Hip & Knee Surgeon

Our Anaesthetists

Dr Ram Adappa

Consultant in Anaesthesia and Neurosciences & Trauma Critical Care

Dr Dean Frear

Consultant in Adult and Paediatric Anaesthesia

Dr Andrea Lavino

Consultant in Anaesthesia and Neurosciences & Trauma Critical Care

Dr Ronan O'Leary

Consultant in Anaesthesia and Neurosciences & Trauma Critical Care


Our Services

Foot & Ankle

The feet and ankles are highly flexible, complex structures containing multiple bones, tendons and ligaments. Our foot and ankle team treat all conditions ranging from bunions, bone deformity and arthritis to painful ligament and Achilles tendon injuries. The foot is divided into three parts: The ankle is formed of the talus bone, which supports the […]


The hand and wrist have multiple small joints that work together to produce motion, including the fine motion needed to thread a needle or tie a shoelace.


The wrist is a complex joint that connects the hand to the forearm. It is formed by the two bones of the forearm—the radius and the ulna—and eight small carpal bones. The carpal bones are arranged in two rows at the base of the hand. There are four bones in each row.


The hip is one of the body's largest joints. It is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone. The ball is the femoral head, which is the upper end of the femur (thighbone).


Your knee is the largest joint in your body and one of the most complex. The bones that make up the knee include the lower end of the femur (thighbone), the upper end of the tibia (shinbone), and the patella (kneecap).

Our Testimonials

Mr McDonnell

Mr Gooding

Mr Johnston