lower limb prosthetics

POSI Patient Jason

POSI’s extensive lower limb prosthetics design options offer unique solutions for all levels of amputation. What differentiates one facility from another is the prosthetist’s fitting technique. We believe socket fit and design is number one to your success with your lower limb prosthetics.

Our ABC certified practitioners each offer unique expertise and extensive experience at each level of amputation. We offer a team approach to care, with your primary practitioner at the lead. POSI is recognized by peers, referral sources, and patients to provide solutions for those who have not had success or progressed therapeutically with other practices.

The POSI team works directly with physical therapists to support you during your rehab to share expertise and assure your progression through both short and long-term goals. Goals are set collaboratively between you, your therapist, and prosthetist.

POSI is privileged to have an excellent working relationship with many of the component manufacturers, such as Ossur and Ottobock. As new lower limb prosthetics technology becomes available, we are often chosen as a Beta test site. Testing new components gives our patients and us the opportunity to provide feedback to the manufactures before the final product goes to market. Based on our success and highly functional patient population, we have been chosen to sit on multiple advisory boards, such as Ossur and Ottobock. And if you’ve ever wondered what goes into a prosthetic check out the video here: Inside a Prosthetic

POSI’s in-house prosthetic fabrication sets standards of excellence unmatched by practices which utilize external fabrication services. Our technicians are ABC certified and frequently participate in continuing education as both instructors and students. Fabrication techniques are progressive; as creativity is combined with the application of modern materials, our technicians continue to evolve their craft. The main advantage to an in-house fabrication; the prosthetists and technicians can collaborate on the design and fabrication process of each prosthesis assuring the best result for our patients.

At POSI, we embrace challenges and offer unique solutions to enable each prosthesis to meet individual goals and expectations. Our experience and dedication will take you to the next level in function and comfort. We take your goals from possibility to reality!

Socket and Suspension Systems

Socket Systems

Style and fit will be unique to the patient’s needs and activity level. There are many systems available; each option will be discussed at length during your visit. At POSI, we encourage and welcome your participation in the design process. Our practitioners have experience working with a variety of socket designs for each level of amputation. Designs are chosen on an individual basis from information gathered during your initial evaluation.

Socket Fit

Socket fit has the biggest impact on success with lower limb prosthetics. There is a correlation between proper fit and perceived weight of the prosthesis; an ill-fitting socket will feel heavy and difficult to manage. Well-fitting sockets should have increased proprioceptive feedback, anatomical control, decreased energy expenditure, total contact, and most of all, be comfortable.


Closely related to the design of the socket is the suspension, or how the socket remains in place on the patient’s limb. Suspension mechanisms are incorporated as part of socket design, and will, therefore, be chosen before casting. The suspension can be achieved through a mechanical lock, suction, or capture of the anatomy.

  • Mechanical lock is achieved by the incorporation of a pin or lanyard attached at the end of a roll on liner which engages into a lock in the socket.
  • Suction suspensions are achieved through a number of methods including seal-in liners and direct skin contact. In addition, air may be evacuated via pump to achieve elevated vacuum.
  • Anatomical suspension is achieved when the contours of the socket capture and hold onto the contours of the patient’s body.

All suspension systems are discussed with the patient to determine which system will work best for their lifestyle and activity level.

Symptoms of a Poor Fitting Socket on a Lower Limb Prosthetics

  • Unable to progress to expected goals
  • Pain
  • Feels like it is a lot of effort and concentration to walk
  • Poor confidence/ balance
  • Skin breakdown, callus, or unusual discoloration
  • Significant space between residual limb and socket in standing position
  • Inability to balance or transfer weight to prosthesis without fear or pain

Results of a Poor Fitting Socket on a Lower Limb Prosthetics

  • Components will be unable to be used to their full potential
  • Regardless of your and your medical team’s efforts, you will be unable to achieve goals
  • Increased risk of damage to skin and joints
  • Increased energy expenditure


POSI prosthetist and technicians are trained and certified by the following manufacturers for the use of their products:

  • Ossur: Power Knee, Symbionic Knee, Symbionic Ankle, Rheo III Knee, Proprio Ankle, Unity Elevated Vacuum, all Flex-Foot systems, all LE systems
  • Ottobock: Genium Knee, C-Leg Knee, Harmony Vacuum System, all LE Systems
  • Freedom: Plie, Kinterra, all LE Systems
  • BioM Power Ankle



Schedule your complimentary evaluation today.


POSI prosthetist and technicians are trained and certified by the following manufacturers for use of their products:

Ossur: Touch Bionics, I-Limb

Otto Bock: Bebionic, Michelangelo

Marlton Office

100 Brick Road, Suite 315
Marlton, NJ 08053
Phone: 856-810-7900
Fax: 856-810-2580


Horsham Office

440 Horsham Road, Suite 2
Horsham, PA 19044
Phone: 215-328-9111
Fax: 215-328-0231

Prosthetic Orthotic Solutions International (POSI) is an outcome based prosthetic fitting & prosthetic care practice in the New Jersey, Pennsylvania and Delaware areas. POSI specializes in; lower limb prosthetics, upper extremity prosthetics, silicone prosthetics, prosthetic arm, and prosthetic leg fittings.