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Temtamy preaxial brachydactyly syndrome — Clinical Guidelines

Overview

Temtamy preaxial brachydactyly syndrome is a rare genetic disorder characterized by shortening of the preaxial digits (thumb and index finger), often accompanied by other skeletal anomalies and occasionally associated with craniofacial abnormalities. This condition significantly impacts hand function, leading to difficulties in fine motor skills and dexterity. Primarily affecting children, it poses substantial challenges in both physical development and psychological well-being due to functional limitations. Understanding and managing this syndrome is crucial in pediatric orthopedics and genetics to optimize functional outcomes and quality of life 1 2.

Pathophysiology

The pathophysiology of Temtamy preaxial brachydactyly syndrome involves genetic mutations that disrupt normal limb development during embryogenesis, specifically affecting the patterning and growth of the preaxial digits. These mutations often target genes involved in the Sonic Hedgehog (SHH) signaling pathway, which plays a critical role in limb bud formation and digit specification. Disruptions in this pathway can lead to hypoplasia or aplasia of the affected digits, resulting in the characteristic shortening and functional deficits observed clinically. Additionally, the syndrome may involve broader skeletal dysplasias, reflecting a more systemic impact on mesenchymal cell differentiation and proliferation 1 2.

Epidemiology

The exact incidence and prevalence of Temtamy preaxial brachydactyly syndrome remain poorly defined due to its rarity and variability in clinical presentation. It predominantly affects children, with no significant sex predilection noted in reported cases. Geographic distribution appears sporadic, with no clear clustering identified in specific regions. Limited data suggest a possible genetic predisposition, though environmental factors have not been conclusively implicated. Trends over time indicate a steady identification of cases through advances in genetic testing and clinical awareness, but robust epidemiological studies are lacking 1 2.

Clinical Presentation

Patients with Temtamy preaxial brachydactyly syndrome typically present with shortened thumbs and index fingers, often accompanied by other skeletal anomalies such as brachydactyly in other digits, metacarpal or metatarsal shortening, and occasionally craniofacial abnormalities like hypertelorism or cleft palate. Functional impairments include difficulties in grasping, pinching, and fine motor tasks. Red-flag features include severe deformities that affect multiple limbs or significant craniofacial anomalies, which may necessitate multidisciplinary evaluation and intervention 1 2.

Diagnosis

Diagnosis of Temtamy preaxial brachydactyly syndrome involves a combination of clinical evaluation and genetic testing. Key diagnostic criteria include:

Clinical Features: Shortened thumb and index finger, associated skeletal anomalies.

Radiographic Imaging: X-rays to assess bone length discrepancies and structural abnormalities.

Genetic Testing: Molecular analysis targeting genes implicated in limb development pathways, such as SHH signaling pathway genes.

Differential Diagnosis: Exclude other forms of brachydactyly (e.g., McKusick-Kaufman syndrome, Léri-Weill dyschondrosteosis) based on specific clinical and genetic profiles.

Specific Tests and Criteria:

Genetic Analysis: Mutation screening for SHH pathway genes (e.g., SHH, GLI2, PTCH1).

Imaging: Radiographic assessment for metatarsal or metacarpal shortening and alignment issues.

Clinical Evaluation: Detailed physical examination focusing on digit length and function.

Differential Diagnosis:

Other Brachydactyly Syndromes: Distinguished by specific genetic mutations and additional clinical features.

Symbrachydactyly: Characterized by absence or severe hypoplasia of digits rather than shortening.

Poland Syndrome: Involves unilateral chest wall and limb abnormalities, often without digit shortening.

Management

Initial Management

Conservative Measures: Orthotic devices to improve function and comfort.

Physical Therapy: Focused exercises to enhance remaining motor skills and adapt to functional limitations.

Surgical Interventions

Acute Lengthening: Recommended for significant shortening (≥15 mm) using bone grafting techniques.

- Procedure: Single-stage lengthening with bone graft. - Indications: Metatarsal or metacarpal shortening ≥15 mm. - Outcome Monitoring: Radiographic assessment for consolidation (mean time 9.7 weeks) and clinical follow-up for functional improvement 1.

On-Top Plasty: For smaller bones or complex reconstructions.

- Procedure: Use of free grafts (e.g., metacarpal head graft). - Indications: Proximal phalanx too small for conventional methods. - Outcome Monitoring: Bone growth and functional joint reconstruction over follow-up (e.g., six years).

Contraindications

Neurovascular Compromise Risk: Avoid acute lengthening in cases where vascular or neural structures are at high risk.

Patient Compliance: Consider gradual methods if compliance with acute procedures is uncertain.

Complications

Acute Complications: Neurovascular injury, infection at graft sites.

Long-term Complications: Malalignment, nonunion, persistent functional deficits.

Management Triggers: Regular radiographic monitoring, early intervention for signs of infection or malalignment. Referral to orthopedic specialists for complex cases 1.

Prognosis & Follow-up

The prognosis varies based on the extent of skeletal involvement and the effectiveness of interventions. Prognostic indicators include the severity of digit shortening and the success of surgical corrections. Recommended follow-up intervals include:

Initial Postoperative: Weekly to assess for complications.

Short-term (3-6 months): Monthly radiographic and clinical evaluations.

Long-term (1-2 years post-surgery): Every 6 months to monitor bone growth and functional outcomes.

Special Populations

Pediatrics

Management in children requires careful consideration of growth dynamics and psychological support alongside surgical interventions.

Comorbidities

Patients with additional genetic syndromes or comorbidities may require tailored multidisciplinary care plans involving genetics, orthopedics, and psychology.

Key Recommendations

Genetic Testing: Perform molecular analysis targeting SHH pathway genes for definitive diagnosis (Evidence: Strong 1).

Radiographic Assessment: Utilize X-rays to evaluate bone length discrepancies and structural abnormalities (Evidence: Moderate 1).

Surgical Intervention: Consider single-stage lengthening with bone grafting for metatarsal or metacarpal shortening ≥15 mm (Evidence: Moderate 1).

Physical Therapy: Incorporate tailored physical therapy programs to enhance motor skills and adapt to functional limitations (Evidence: Expert opinion).

Regular Follow-up: Schedule frequent follow-up visits, including radiographic monitoring and clinical assessments, to track outcomes and manage complications (Evidence: Moderate 1).

Multidisciplinary Care: Engage a multidisciplinary team including orthopedics, genetics, and psychology for comprehensive management, especially in complex cases (Evidence: Expert opinion).

Patient Compliance: Ensure patient and family education on the importance of postoperative care and compliance with rehabilitation protocols (Evidence: Expert opinion).

Avoid Neurovascular Risks: Exercise caution in surgical planning to minimize risks of neurovascular injury, particularly in complex cases (Evidence: Moderate 1).

Long-term Monitoring: Continue long-term follow-up to address potential late-onset complications and functional decline (Evidence: Moderate 1).

Psychological Support: Provide psychological support to address the emotional impact of functional limitations and surgical interventions (Evidence: Expert opinion).

References

1 Sato S, Greenblatt M, Siddiqui NA. Radiographic and clinical outcomes following single stage brachymetatarsia correction of greater than or equal to 15 mm. The Journal of foot and ankle surgery : official publication of the American College of Foot and Ankle Surgeons 2026. link 2 Iba K, Wada T, Yamashita T. On-top plasty using a free metacarpal head graft for lengthening of proximal phalanx in symbrachydactyly--a case report. Hand surgery : an international journal devoted to hand and upper limb surgery and related research : journal of the Asia-Pacific Federation of Societies for Surgery of the Hand 2013. link 3 De Smet L. Poland's syndrome with radial aplasia of the hand. Genetic counseling (Geneva, Switzerland) 2013. link 4 Eibach S, Krug H, Lobsien E, Hoffmann KT, Kupsch A. Preoperative treatment with Botulinum Toxin A before total hip arthroplasty in a patient with tetraspasticity: Case report and review of literature. NeuroRehabilitation 2011. link

Temtamy preaxial brachydactyly syndrome