WHY GMK SPHERE?
GMK Sphere is an innovative implant design, validated by 10 years of clinical experience and evidence. Over 150’000 patients to date have benefited from GMK Sphere’s medial ball-in socket stability. There's ever more evidence on survival and performance validated by multiple national registries and numerous clinical studies.
Medial ball-in socket, the optimal design to provide 1:1 congruency throughout the whole range of motion providing high functional stability during the most demanding activities.
Flat lateral compartment, ensuring complete freedom of rollback and rotation to accommodate the best pattern of kinematic motion for each patient.
Patients who receive a total knee replacement prefer a feeling of “stability”. In a study in which bilateral patients had a conventional knee design with CR or PS in one knee and MS in the other, 76% of patients preferred the knee with the medial “ball in socket” .
GMK Sphere has proven to be preferred by patients when compared to both CR and PS implant designs .
An increasing number of designs aim to be more stable in the medial compartment, but only a true Ball-in-Socket (BiS) design with 1:1 congruency on the medial side ensures stability.
PATIENT SPECIFIC KINEMATICS
Computer modelling suggested that GMK Sphere provides kinematic patterns without imposing any predetermined motions. This was validated in multiple dynamic fluoroscopic analyses showing patient-specific kinematic patterns with no paradoxical motion.
NATURAL PATELLA TRACKING
The GMK Sphere trochlea groove has been designed asymmetric, deep and lateralized by 2 mm in comparison to the midline of the femoral component. This design allows for more natural medial-lateral translation of the patella during flexion-extension and can reduce the stress on either the natural patella or a patellar implant, also reducing the risk of subluxation.
GMK Sphere design was developed through analysis of more than 15.000 CT and MRI scans from the MyBody database.
GMK SPHERE BACKGROUND
Prof. V. Pinskerova
EVOLUTION OF PROVEN CONCEPTS
Dr. G. Scott
Meet with experienced users from around the world
Several published papers, including two studies using advanced 3D moving fluoroscopy technology, have shown that GMK Sphere provides higher stability than other implant designs, while allowing natural and subject-specific motion patterns.
IN VIVO STUDY OF THE GMK SPHERE TKA
THE INFLUENCE OF KNEE DESIGN ON HIGH FLEXION
A. S. Greenwald
IMPLANT STABILITY: A REASON TO CHANGE?
MEDIALLY STABILIZED TKA: THE PATELLA-FEMORAL JOINT
D. W. Manning
BIOMECHANICS AND KINEMATICS OF THE KNEE JOINT
W. R. Taylor
Since GMK Sphere was first released 10 years ago, it has achieved good clinical results, with 99.35% survival rate at 6 years . GMK Sphere has proven to be preferred by patients.
VALGUS KNEES TREATED WITH GMK SPHERE
GMK Sphere design and Kinematic Alignment are based on similar observations of anatomy and share the same goal of improving patient outcomes through restoration of the biomechanics of the natural knee.
Distinctive features of the GMK Sphere design reflect these goals and it is now the prosthesis preferred by the originator of Kinematic Alignment surgical technique.
CALIPERED KINEMATIC ALIGNMENT: A PERSONALIZED APPROACH TO TKA SURGERY
KINEMATIC ALIGNMENT MEETS KINEMATIC DESIGN
PARTIAL PROBLEMS AND TOTAL SOLUTIONS
PERSONALIZED SOLUTIONS AND TAILORED EDUCATION PROGRAM FOR TKA
GMK Sphere is part of a complete system that includes advanced implant material solutions and dedicated personalized surgical techniques and technologies. GMK Sphere is also part of the comprehensive GMK System ranging from GMK UNI for unicompartmental procedures to GMK Hinge for revision surgery. The system allows very easy transition from GMK Sphere to a semi-constrained (GMK Revision) or a fully constrained (GMK Hinge) solutions and also enables the use of GMK Sphere with revision tibia options like wedges and stems.
With the M.O.R.E. Institute the surgeon is never alone when discovering new technologies
 PRITCHETT, James W. Patients prefer a bicruciate-retaining or the medial pivot total knee prosthesis. The Journal of arthroplasty, 2011, 26.2: 224-228.
 DOWSEY, Michelle M., et al. A randomized controlled trial comparing a medial stabilized total knee prosthesis to a cruciate retaining and posterior stabilized design: a report of the clinical and functional outcomes following total knee replacement. The Journal of Arthroplasty, 2020, 35.6: 1583-1590. e2.
 R. Field, G. Scott, J. Skinner, P, Van Overschelde, GMK Sphere Study Report – Six-years follow-up. 99.26SPHERE.1CL2 rev. 00, May 2022