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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Orthopedics

Restoring Function: Upper Limb Treatment Strategies

At a Glance

Treatment for upper limb hemimelia prioritizes hand function and wrist alignment over prosthetics. Key interventions include early splinting, pollicization to create a functional thumb, and surgeries like centralization to align the wrist, helping children maximize independence and daily function.

Treatment for radial and ulnar longitudinal deficiencies focuses on maximizing a child’s independence by improving their ability to reach, grasp, and manipulate objects [1]. Because the hands are central to how we interact with the world, the goals of care are divided between improving the function of the hand and the alignment of the wrist [2][3].

While prosthetics are common for lower-limb differences, they are used much less frequently for the arm or hand. This is because prosthetics cover the skin, blocking sensory feedback (the ability to feel textures and temperatures), which is crucial for hand function. Most children prefer to use their own biological arms, sometimes aided by simple adaptive tools [4].

The Importance of the Thumb: Pollicization

In many cases of radial deficiency, the thumb is either very small (hypoplastic) or missing entirely (aplastic) [5]. This makes it difficult for a child to “pinch” or “grasp” small objects.

  • What it is: Pollicization is a specialized surgery where the index finger is carefully moved and repositioned to function as a thumb [6][7].
  • The Goal: To restore the essential “pinch” function that is vital for tasks like buttoning a shirt or holding a pencil [3][8].
  • Why Early? Performing this procedure early (often before age 2 or 3) allows the child’s brain to “rewire” itself, essentially learning to use the index finger as a thumb as they grow and develop [3][9].

Aligning the Wrist: Centralization and Radialization

When the radial bone (the bone on the thumb-side of the forearm) is missing or short, the wrist often bows inward toward the thumb. This is called radial club hand [2].

  • Centralization: The surgeon repositions the hand so it sits directly over the end of the ulnar bone (the pinky-side bone) [10].
  • Radialization: A similar procedure that shifts the hand slightly differently to help prevent the wrist from bowing back toward the thumb side [11][12].
  • The Trade-off: It is important to know that these surgeries involve a functional compromise. Centralization often results in permanent wrist stiffness and a reduced range of motion. You are trading some wrist flexibility for improved alignment and stability [13]. Additionally, there is a high rate of recurrence for radial deviation as the child grows [14].
  • The Role of Distraction: In severe or “fixed” cases where the skin and muscles are very tight, doctors may use gradual distraction (sometimes using a hexapod or Ilizarov external frame) [10]. This frame slowly stretches the soft tissues over several weeks before the main surgery, which can lead to a better correction with fewer complications [15][16].

Ulnar Longitudinal Deficiency (ULD)

Ulnar differences are less common and treatment varies based on how much the forearm is affected [17]. In mild cases, no surgery may be needed if the child has good function [17]. In more severe cases where the forearm bones are fused or unstable, a single-bone forearm surgery may be performed to create a stable “platform” for the hand to function [18].

The Role of Early Intervention

Treatment begins long before any surgery. From the time of diagnosis, the “gold standard” of care includes:

  • Passive Stretching: Gently stretching the tight muscles on the thumb side of the wrist to maintain as much flexibility as possible [2].
  • Splinting: Using custom-made braces to hold the wrist in a straight position during sleep or play [2].
  • Occupational Therapy: Working with specialists to help your child find adaptive ways to play and learn as they grow [19].

While surgery can significantly improve the appearance and alignment of the limb, many children will require future monitoring and touch-up procedures as they grow [13].

Previous: Lower Limb Treatment Strategies | Return to Home | Next: Building Your Care Team

Common questions in this guide

Why are prosthetics rarely used for upper limb hemimelia?
Prosthetics are rarely used because they cover the skin and block sensory feedback, which is crucial for feeling textures and temperatures. Most children prefer using their natural biological arms to interact with their environment, sometimes with the help of simple adaptive tools.
What is pollicization surgery?
Pollicization is a specialized surgery used when a child's thumb is missing or underdeveloped. The surgeon carefully repositions the index finger to function as a thumb, restoring the essential 'pinch' grasp needed for daily tasks like holding a pencil or buttoning a shirt.
How is radial club hand treated?
Radial club hand is often treated with procedures called centralization or radialization, which realign the hand over the forearm bones. While these surgeries improve the arm's alignment and stability, they often involve a trade-off, resulting in some permanent wrist stiffness.
What is gradual distraction and why is it used?
Gradual distraction uses an external frame, such as a hexapod or Ilizarov device, to slowly stretch tight skin and muscles over several weeks. This technique is used before the main wrist alignment surgery to safely prepare the soft tissues, resulting in better correction with fewer complications.
What non-surgical therapies are important for upper limb deficiencies?
Even before surgery is considered, early interventions like passive stretching, custom splinting, and occupational therapy are vital. These therapies help maintain flexibility in tight muscles, keep the wrist as straight as possible, and assist the child in finding adaptive ways to play and learn.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is the degree of radial deviation in our child's wrist, and is it considered a flexible or fixed deformity?
  2. 2.Is the thumb stable enough for grasp, or is pollicization (index finger thumb reconstruction) a necessary part of the long-term plan?
  3. 3.How does the use of gradual distraction (like a hexapod or Ilizarov frame) help reduce risks during the centralization surgery?
  4. 4.Can you show us the specific stretching and splinting routine we should start now to prepare our child for future surgery?
  5. 5.What are the chances that our child will need secondary 'touch-up' surgeries as they grow, and how do we monitor for recurrence of the wrist bowing?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (19)
  1. 1

    An Algorithm for Management of Radial Longitudinal Deficiency.

    Bhat AK, Pai G M

    The journal of hand surgery Asian-Pacific volume 2024; (29(6)):508-518 doi:10.1142/S2424835524300093.

    PMID: 39544041
  2. 2

    Clinical and functional results of radial club hand with centralization and pollicization using the second metacarpus: A clinical case series.

    Lahiji FA, Asgari F, Mirzaee F, et al.

    International journal of surgery case reports 2019; (61()):285-290 doi:10.1016/j.ijscr.2019.07.076.

    PMID: 31401436
  3. 3

    Functional Evaluation of Pollicization in Young Children with Radial Longitudinal Deficiency: Beneficial Results Despite the Presence of Finger Anomalies.

    Mehta R, Sripathy AK, Thatte MR

    Indian journal of orthopaedics 2026; (60(4)):886-892 doi:10.1007/s43465-025-01639-4.

    PMID: 42027321
  4. 4

    Upper extremity prosthesis user perspectives on unmet needs and innovative technology.

    Benz HL, Jia Yao , Rose L, et al.

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference 2016; (2016()):287-290 doi:10.1109/EMBC.2016.7590696.

    PMID: 28268333
  5. 5

    Association of Radial Longitudinal Deficiency and Thumb Hypoplasia: An Update Using the CoULD Registry.

    Forman M, Canizares MF, Bohn D, et al.

    The Journal of bone and joint surgery. American volume 2020; (102(20)):1815-1822 doi:10.2106/JBJS.20.00281.

    PMID: 33086350
  6. 6

    Index pollicization: an evolution of ideas and techniques from a paediatric orthopaedic institution.

    Carter PR, Ezaki M, Oishi S

    The Journal of hand surgery, European volume 2022; (47(10)):1004-1015 doi:10.1177/17531934221121897.

    PMID: 36071638
  7. 7

    Pollicization of the Index Finger in the Treatment of Thumb Hypoplasia.

    Mendez M, Parot C, Pino P, et al.

    Techniques in hand & upper extremity surgery 2020; (25(3)):136-141 doi:10.1097/BTH.0000000000000322.

    PMID: 33165167
  8. 8

    Bilateral mirror hand: 2-year follow-up and literature review.

    González-Pola R, Hernández-Álvarez MA, Domínguez-Castro CR, et al.

    Acta ortopedica mexicana 2020; (34(4)):261-266.

    PMID: 33535286
  9. 9

    Pollicization of index Fingers For Bilateral Hypoplastic Thumbs of Twin Babies: Case Series At Cure Children's Hospital of Ethiopia.

    Mohammed T, Jimma TM, Zerfu TT, Kassaahun ME

    International medical case reports journal 2024; (17()):327-333 doi:10.2147/IMCRJ.S454360.

    PMID: 38623353
  10. 10

    Current Concepts in Radial Club Hand.

    Takagi T, Seki A, Takayama S, Watanabe M

    The open orthopaedics journal 2017; (11()):369-377 doi:10.2174/1874325001711010369.

    PMID: 28603568
  11. 11

    Radial Club Hand Treated by Paley Ulnarization Generation 3: Is this the New Centralization?

    Deszczynski JM, Albrewczynski T, Shannon C, Paley D

    Children (Basel, Switzerland) 2021; (8(7)) doi:10.3390/children8070562.

    PMID: 34210017
  12. 12

    Randomized Trial Comparing Preliminary Results of Radialization and Centralization Procedures in Bayne Types 3 and 4 Radial Longitudinal Deficiency.

    Mittal S, Garg B, Mehta N, et al.

    Journal of pediatric orthopedics 2020; (40(9)):509-514 doi:10.1097/BPO.0000000000001606.

    PMID: 32931691
  13. 13

    Outcomes of radialization for radial longitudinal deficiency: 20 limbs with minimum 5-year follow-up.

    Bhat AK, Narayanakurup JK, Acharya AM, Kumar B

    The Journal of hand surgery, European volume 2019; (44(3)):304-309 doi:10.1177/1753193418788935.

    PMID: 30056773
  14. 14

    Management of a severe radial longitudinal deficiency using a magnetically controlled growing rod.

    Le Hanneur M, Langlais T, Fitoussi F

    The Journal of hand surgery, European volume 2022; (47(5)):527-529 doi:10.1177/17531934211051289.

    PMID: 34633884
  15. 15

    Treatment of severe radial club hand by distraction using an articulated mini-rail fixator and transfixing pins.

    Romana C, Ciais G, Fitoussi F

    Orthopaedics & traumatology, surgery & research : OTSR 2015; (101(4)):495-500.

    PMID: 25907512
  16. 16

    Outcomes of early treatment of radial dysplasia.

    Nguyen PD, Light TR, Mai TT

    Journal of clinical orthopaedics and trauma 2024; (50()):102357 doi:10.1016/j.jcot.2024.102357.

    PMID: 38370427
  17. 17

    Ulnar hemimelia: a report of four cases.

    Özdemir M, Turan A, Kavak RP

    Skeletal radiology 2019; (48(7)):1137-1143 doi:10.1007/s00256-019-3167-x.

    PMID: 30712123
  18. 18

    Soft-Tissue Distraction Prior to Single Bone Forearm Surgery in Ulnar Longitudinal Deficiency: A Report of Two Cases.

    Schachinger F, Girsch W, Farr S

    The journal of hand surgery Asian-Pacific volume 2018; (23(1)):153-157 doi:10.1142/S2424835518720116.

    PMID: 29409418
  19. 19

    Swedish parents' experiences of their role in treatment for children with congenital limb reduction deficiency: Decision-making and treatment support.

    Sjöberg L, Hermansson L, Lindner H, Fredriksson C

    Child: care, health and development 2020; (46(6)):723-732 doi:10.1111/cch.12802.

    PMID: 32789897

This page provides educational information about treatment strategies for upper limb hemimelia. It is not a substitute for professional medical advice; always consult a pediatric orthopedic specialist to determine the best care plan for your child.

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