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Department of Orthopedics, Yokohama City University Hospital

Conditions Treated
Gonarthrosis (Disorder in the Knee with Cartilage Loss of up to 50%), Spontaneous Osteonecrosis of the Knee, Coxarthrosis.

Treatment Methods (Medial Opening Wedge High Tibial Osteotomy, Minimally Invasive Surgical Procedure for Total Hip Arthroplasty Using a Navigation System)

The introduction of artificial joints has led to great progress in surgery for gonarthrosis. In cases of total knee arthroplasty, however, there are some limitations such as the high cost of surgical operation and limited flexion angle of the knee of 120 to 130 degrees after the operation with artificial knee joint products that are mostly from Europe or the U.S. This method may not be preferable if the flexion angle of the knee needs to be 140 to 150 degrees for daily life activities or for religious reasons, for example. This is why osteotomies are performed, which are lower in cost and the flexion angle is less limited. In conventional operative methods, however, part of the shin bone close to the knee joint is cut off to adjust the direction of load, and so it takes two to three months for the patient to be able to walk with load (under their own weight). This problem has not yet been solved.

In the medial opening wedge high tibial osteotomy developed by our department, no bone is cut off and instead a wedge-shaped piece of artificial bone to adjust the direction of load is inserted into the part where a cut is made on the bone. State-of-the-art rigid plates made of titanium are used to fix the bones, and so the patient can start load-bearing walking one week after the operation. The inserted artificial bone is replaced with the patient’s own bone after several years; no artificial object is left in the body. At present, few hospitals are able to perform this operation, but we introduced it in our hospital early on, so we have an abundance of achievements with the operation.

For coxarthrosis patients, we perform a minimally invasive surgical procedure for total hip arthroplasty (MIS-THA) using a navigation system, in which artificial joints are positioned more accurately, making it possible to keep using them in a stable manner for a long time.

Moreover, this procedure requires only a minimal portion of skin and muscle to be incised,
thus enabling a rapid recovery of muscle after surgery and discharge from the hospital after
about ten days to two weeks. For minimally invasive but highly accurate bone insertion, the
surgeon must have precise, skilled manual techniques and much experience.

Features of Our Department

Treatment Results

Treatment Results

As the number of elderly people in Japan increases, the demand for surgery of lower limb joints has been increasing, and therefore medical treatments that maintain excellent physical condition for a long time after surgery are required. The Department of Orthopedics is among the leaders in the field of joint surgery in Japan, and has been developing new, less invasive techniques. In addition to joint surgery, we are one of the few medical facilities to offer treatments for malignant musculoskeletal tumors.

Yokohama City University Hospital is founded on the principles of providing safe and high-quality medical treatment, and promoting skilled, advanced medical treatment. Including the Department of Orthopedics, the hospital is known for its excellent ethics and medical treatment safety. We have an extensive range of image diagnosis equipment, such as a multi-slice CT system and MRI system, which are invaluable for orthopedic medical procedures.

A Message to International Patients from Our Department

Dr. Hirohiko Inanami
Dr. Tomoyuki Saito
Director of the Department of Orthopedics

As joint surgeons, we offer a variety of options according to the individual lifestyles and needs of our patients, based on our experience and advanced techniques in various fields.

Through consultations with a doctor before surgery to clearly explain the operative methods and treatment results, we encourage patients to understand and believe in their treatment methods. Nevertheless, for the outcome of joint surgery it is also important to maintain an excellent physical condition for a long time, both before and after the operation. Therefore, we strive to perform highly accurate surgery without compromise.

The City of Yokohama where our hospital is located is a historical port city, an area where
people are used to socializing with international visitors. Our hospital rooms offer wonderful
views of the ocean stretching into the distance. You will enjoy the people of Yokohama as
well as the scenery.

Overview of the Treatment Schedule
(Model Case: Medial Opening Wedge High Tibial Osteotomy)

To judge your admission, we need X-ray photographs of the knee (preferably accompanied by other image data such as MRI images) and blood test results.

If you are accepted for admission, a family member or friend can stay at a nearby hotel, or the hospital’ s accommodation if an application is made in advance.

Overview of the Treatment Schedule


External View of Our Hospital View of Surgery Entrance Lobby (Second Floor) Outpatient Waiting Room (Second Floor)
External View of Our Hospital View of Surgery Entrance Lobby (Second Floor) Outpatient Waiting Room (Second Floor)
Hospital Contact Information
Phone (for international visitors) :
Established 1949
(Orthopedics Course Started;
Hospital Established in July 1991)
Clinical Departments
Spine (Cervical Vertebrae, Thoracic Vertebrae, Lumbar Vertebrae, Scoliosis) Clinic, Knee and Foot Clinic, Sports Clinic, Hip Joint/ Infant Clinic, Upper Limb (Shoulder, Elbow, Arm)/ Tumor/Electromyogram Clinic, Rheumatism Clinic
Payment Methods
Cash, Debit Card, Credit Card (DC, VISA, MasterCard. JCB, American Express, Diners Club, Discover) (Payment should be made immediately on the day in principle.)


3-9 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa 236-0004
From the JR Shin-Sugita Station or
Keihin-Kyuko Kanazawa-Hakkei Station,
transfer to the Seaside Line
for Shidai-lgakubu Station.
30 minutes from Tokyo International Airport (Haneda Airport) by car
via Shuto-Kosoku Wangan Line