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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.

 

 

FEATURES

GMK Sphere, with true medial ball-in socket stability.

Ball-in socket

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.

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BENEFITS

  

Patient

PATIENT SATISFACTION

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” [1].
GMK Sphere has proven to be preferred by patients when compared to both CR and PS implant designs [2].

Stability

STABILITY

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. 

Kinematics

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.

Tracking

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.

Fit

ANATOMICAL FIT

GMK Sphere design was developed through analysis of more than 15.000 CT and MRI scans from the MyBody database.

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DEVELOPED BY THE ORIGINATORS OF TRULY MEDIALLY STABLE KNEE IMPLANTS

GMK Sphere was developed with a worldwide group of orthopedic surgeon experts, and is based on Prof. Michael Freeman and Prof. Vera Pinskerova's breakthrough analyses of knee anatomy and kinematics.

 
DESIGN RATIONALE

DESIGN RATIONALE

 

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CLINICAL EVIDENCE

GMK Sphere was designed to provide maximum functional stability while allowing natural knee motion. It's proven to deliver outstanding functional outcomes and pain relief.

Meet with experienced users from around the world   

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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

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[1] PRITCHETT, James W. Patients prefer a bicruciate-retaining or the medial pivot total knee prosthesis. The Journal of arthroplasty, 2011, 26.2: 224-228.

[2] 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.

[3] R. Field, G. Scott, J. Skinner, P, Van Overschelde, GMK Sphere Study Report – Six-years follow-up. 99.26SPHERE.1CL2 rev. 00, May 2022