Hip disarticulation prosthesis
A comprehensive prosthetic system built from the hip joint down, consisting of a hip joint, prosthetic knee and prosthetic foot.
What is a hip disarticulation prosthesis?
A hip disarticulation prosthesis is a comprehensive application built from the hip joint down, at one of the highest levels of the lower limb. This level covers two closely related forms of amputation: in hip disarticulation, the leg is separated at the hip joint and the pelvis is preserved; in hemipelvectomy (transpelvic amputation), part of the pelvis is also removed together with the leg. In both cases, since the person's own hip joint no longer functions, all phases of gait must be handled by the prosthetic components.
The system usually consists of a socket that fits around the trunk and pelvis, connected to a prosthetic hip joint, a prosthetic knee and a prosthetic foot. As the level rises, the function the prosthesis must take on increases, so the compatible selection of components, individual alignment and a comprehensive rehabilitation process are of great importance. The application is planned through a specialist physician's assessment, taking into account the person's general health, activity level and goals.
Structure of the system
In hip-level applications, the prosthesis consists of a series of components connected to one another from bottom to top. At the top is the socket surrounding the trunk and pelvis; this is followed in turn by the prosthetic hip joint, the prosthetic knee and the prosthetic foot. The behavior of each component is adjusted not in isolation but so that they work together throughout the gait cycle.
This integrated structure aims to support balance and load-bearing while standing, and the initiation of the step, the swing and safe heel strike while walking. The match in dimensions and alignment between the components directly affects the overall comfort and safety of the system.
- A custom-made pelvic socket that fits around the trunk and pelvis
- A prosthetic hip joint that initiates the step and provides controlled flexion-extension
- A prosthetic knee that manages support in the swing and stance phases
- A prosthetic foot that supports balance and forward propulsion through contact with the ground
Components of the system
The components are planned together as a whole; selection and adjustment are carried out under the guidance of the physician and the clinical team.
Pelvic / trunk socket
Creates the connection between the body and the prosthesis; supports load-bearing and control by distributing the load around the pelvis.
Prosthetic hip joint
Initiates the step; manages the controlled forward and backward movement of the hip during progression.
Prosthetic knee
Provides support in the stance phase and the controlled forward movement of the leg in the swing phase.
Prosthetic foot
Contributes to balance and forward propulsion during ground contact, load transfer and the transition from heel to toe.
How the hip joint works and step initiation
At this level, one of the most decisive aspects of gait is how the step is initiated. The person transfers movement to the prosthetic hip joint using their trunk and pelvis; the joint converts this input into controlled flexion, starting the forward swing of the leg. The prosthetic knee and foot then come into play to complete the step.
The forward and backward range of motion of the hip joint affects the length and timing of the next step. For this reason, the joint is adjusted individually to match the person's natural rhythm and walking speed. A well-matched setting aims to help make steps more predictable and balanced.
Component options at the hip level
In hip disarticulation applications, the knee and hip components are planned as a whole. For the knee, mechanical and microprocessor-controlled systems are considered; for hip movement, a prosthetic hip joint is considered. Suitable components are determined by the specialist team according to the person's condition and goals.
Mechanical knee system
A simple and durable knee option that provides balance and support through hydraulic or mechanical mechanisms using preset settings.
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Microprocessor-controlled knee system
A knee option that detects gait through sensors and aims to adapt resistance to the phase of the step and the terrain, supporting adaptation and safety in changing conditions.
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Prosthetic hip joint
Since the person's own hip joint is not functioning, this component takes on the initiation of the step and the controlled forward-backward movement of the hip. It is aligned to work in harmony with the knee and foot.
Types of prosthetic hip joints
Hip joints come in different types depending on their working principle. Which type is suitable is determined by the specialist team according to the person's condition, balance needs and activity goals. The information below is for general, neutral introduction purposes.
Single-axis (mechanical)
Works around a single fixed axis of rotation (like a hinge). It is simple, durable and lightweight; motion and stability control are relatively limited.
Free-motion
Allows free flexion-extension; it makes sitting particularly easier. Gait control depends largely on the user's skill.
Hydraulic
A hydraulic damper adjusts swing and stance resistance. It supports adaptation to changing walking speeds and a smoother swing.
Polycentric (multi-axis)
Contains more than one axis of rotation; the instantaneous center of rotation shifts with movement. It aims to increase stability in the stance phase and foot clearance (height off the ground) in the swing phase, reducing the risk of tripping. Some designs also offer three-dimensional movement and rotation.
Powered (motorized)
A motorized actuator provides external assistive torque to the movement. Although powered knee and foot units are in use, the powered hip joint is still at the research and prototype stage; it is not yet in widespread clinical or commercial use.
Energy demand and why it is a more comprehensive application
These factors explain why hip-level applications require a gradual and individual process.
More function
Since the person's own hip joint is not functioning, all phases of gait are handled by the prosthetic components.
Energy requirement
The literature reports that walking with a hip-level prosthesis requires markedly more energy per unit distance. Values vary depending on the person and the situation.
Walking speed
Comfortable walking speed is usually lower than that of people without an amputation. For this reason, some people may prefer assistive solutions for short distances.
Coordination
The trunk, pelvis and prosthetic components working in harmony requires coordination that takes time to learn.
Gradual progress
Goals are set individually; progress is usually achieved step by step with regular follow-up.
Gait biomechanics
Anterior pelvic tilt
Tilting the pelvis forward is a compensatory movement for step initiation and balance; when excessive, it may affect comfort and energy cost.
Toe clearance
Sufficient clearance is needed during swing so that the prosthetic leg does not catch on the ground. Polycentric joints help increase this clearance through effective limb shortening during swing.
Stance phase stability
The joints remaining stable as body weight is transferred to the prosthetic leg supports safe standing and weight transfer.
Gait asymmetry
Because of passive joints and compensatory movements, step length and duration may differ between the two sides.
Socket comfort and sitting
In hip-level applications, the socket is the main component that carries body weight and controls the prosthesis; for this reason, its fit and comfort are of great importance. The socket is made by taking custom measurements around the pelvis, and the aim is to distribute the load evenly over a wide area.
A well-fitting socket affects comfort not only when walking but also when sitting. Being able to flex the prosthetic hip joint appropriately while sitting and to position the socket without creating pressure makes daily use easier. The fit may be reassessed at check-ups according to edema, volume changes and differences that develop over time.
Balance and safety
Standing balance
The behavior of the components in the stance phase is intended to support balance while standing and when shifting position.
Controlled movement
The prosthetic knee and foot working in harmony aims to help make steps safer and more predictable.
Assistive devices
Throughout the process, a cane or similar assistive devices may be used on the recommendation of the physician and physiotherapist.
Comprehensive rehabilitation and gait training
In hip-level applications, rehabilitation is perhaps the most decisive factor in using the system efficiently. Since walking requires well-matched coordination of the trunk, pelvis and prosthetic components, this coordination is acquired through planned and regular training.
The process usually begins with basic standing and weight-transfer exercises in parallel bars; it then progresses toward skills such as initiating steps, turning and walking on different surfaces. Gait training and regular follow-up aim to help the person benefit from the prosthesis safely and efficiently. The program is planned individually according to the person's goals.
Daily life and expectations
The level of function that can be achieved in daily life with a hip disarticulation prosthesis varies from person to person. For some people, the goal is to move safely at home and in the immediate surroundings; for others, it is to approach a more active daily routine. These goals are set together within a realistic and gradual framework.
Discussing expectations clearly from the start helps the process progress well. Putting on and taking off the prosthesis, sitting down and standing up, and habits of use throughout the day are supported with training. Results vary according to general health, strength, balance and participation in rehabilitation, and are determined by the physician's assessment. In addition, the cosmetic cover (cosmesis) that gives the prosthesis a natural appearance is also important for psychosocial acceptance in daily life.
Component compatibility and alignment
The hip, knee and foot components working together as a whole, rather than individually, is decisive for safe movement. Since the setting of one component affects the behavior of the others, selection and set-up are handled as a whole.
Alignment defines the position and angles of the components relative to each other and is carried out individually. Correct alignment directly affects balance, step symmetry and walking comfort. Fine adjustments made during the trial stage may be reassessed over time during check-ups.
Residual limb and skin care
The health of the area and skin in contact with the socket is an important part of using the prosthesis comfortably. Regular cleaning, observing the skin and caring for components such as the socket and liner are recommended as part of the daily routine.
If redness, pressure marks, irritation or discomfort are noticed on the skin, use should be reviewed and, if necessary, the center that carried out the fitting should be contacted. Since care recommendations may vary from person to person, detailed guidance is provided by the clinical team.
Structural safety and standards
The durability of prosthetic hip joints is assessed according to an internationally recognized standard. ISO 15032 defines structural strength tests for hip joint units and covers both single-load (static) and repeated-load (cyclic/fatigue) scenarios.
The tests are applied separately in the anterior-posterior and medio-lateral loading planes; the aim is to verify that the joint can safely carry the loads that may be encountered in daily use. A hip joint suitable for clinical use is expected to pass such structural tests.
The application process
Physician's Prescription / Medical Report
The application begins with a specialist physician's prescription/medical report.
Comprehensive Assessment
The person's condition, goals and activity level are assessed; suitable components are planned.
Measurement and Trial
A custom-made socket and system are produced; trial fitting and alignment adjustments are carried out.
Rehabilitation
Step-by-step gait training is provided; coordination and confidence are developed gradually.
Follow-up and Adjustment
Check-ups are planned; fit, alignment and maintenance are reassessed over time.
Frequently asked questions
Is it possible to walk with a hip disarticulation prosthesis?
Walking can be supported with suitable component selection and comprehensive rehabilitation. Individual results vary according to general health, strength, balance and activity level, and are determined by the physician's assessment.
What is the difference between hip disarticulation and hemipelvectomy?
In hip disarticulation, the leg is separated at the hip joint and the pelvis is preserved. In hemipelvectomy, part of the pelvis is also removed together with the leg. In both cases, hip, knee and foot function is recreated with the prosthesis.
What types of prosthetic hip joints are there?
There are single-axis (mechanical), free-motion, hydraulic and polycentric (multi-axis) types. The suitable type is determined by the specialist team according to the person's condition, balance and activity goals.
Is there a powered (motorized) hip joint?
Powered knee and foot units are in use; however, the powered hip joint is still at the research and prototype stage and is not yet in widespread clinical use.
Why is rehabilitation so important at this level?
Since all phases of gait are handled by the prosthetic components, well-matched coordination of the trunk, pelvis and components requires planned training. Gait training and regular follow-up help the person benefit from the system efficiently and safely.
Why does a hip disarticulation prosthesis require more energy?
Since the person's own hip joint is not functioning, a longer lever and the control of more components are involved; this usually means higher energy expenditure while walking. Gradual training helps manage this demand.
Is the prosthesis uncomfortable when sitting?
A well-fitting socket and a properly adjusted hip joint support comfort while sitting. If pressure or discomfort is noticed, the fit can be reassessed at the center that carried out the fitting.
Is the socket readjusted over time?
Since residual limb volume and skin may change over time, the socket fit is reassessed at check-ups and adjusted when necessary. Regular follow-up is recommended.
How long does it take to start walking?
This period varies from person to person and cannot be stated precisely in advance. Progress is gradual, depending on the person's condition, goals and participation in rehabilitation, and is guided by the physician.
This content is for informational purposes; please consult your physician for diagnosis and treatment. Applications are carried out at our licensed center locations in line with a specialist physician's prescription/medical report.