Candela Andrade et al: Biomechanical evaluation of carpal joint ligaments in the cat: An experimental and radiographic cadaveric study
Veterinary Surgery 7, 2026
🔍 Key Findings
- Study population and testing: Sixty carpal joints from 30 adult cats were evaluated using standardized 20 N varus, valgus, and extension loads with radiographic measurements before and after selective ligament transection.
- Medial collateral ligament alone is not a major stabilizer: Isolated transection increased valgus angulation by approximately 3°, below the 6.4° measurement tolerance, without clinically relevant radiographic instability.
- Lateral collateral ligament is the primary lateral stabilizer: Transection produced marked varus instability (+16.8°) and ulnocarpal subluxation. The palmar ulnocarpal and accessory ulnar ligaments provided secondary support.
- Palmar radiocarpal ligament is essential for proximal stability: Its disruption produced approximately 7° of valgus deviation and 28° of hyperextension with radiocarpal subluxation. Combined palmar and medial collateral ligament disruption was associated with antebrachiocarpal luxation.
- Flexor retinaculum significantly resists hyperextension: Disruption of the flexor retinaculum and associated tissues increased extension by approximately 19° (p = .005), whereas isolated flexor myotomy or tenotomy produced no measurable instability.
- Palmar intercarpal ligaments stabilize the middle carpal and accessory carpal regions: Their disruption caused approximately 13° of increased extension, mediocarpal subluxation, and accessory carpal bone luxation.
- Palmar carpometacarpal ligaments stabilize the distal carpus: Their disruption produced approximately 12.3° of hyperextension, with carpometacarpal instability. Marked hyperextension occurred in 5 of 7 tested limbs.
- Clinical implications: Feline carpal stability depends on coordinated ligamentous and fascial structures. Isolated ligament repair may be insufficient when associated stabilizers are disrupted. Because this was a cadaveric study with some structures transected together, clinical treatment outcomes cannot be inferred directly.
Know What Matters in the Literature - and Why
We distill peer-reviewed surgical studies into clinically relevant summaries and
exam-style questions, so you can make informed decisions with confidence.
Free Access. No Spam. Just Smarter Surgical Learning
Multiple Choice Questions on this study
In Candela Andrade 2026 et al., on feline carpal biomechanics, which ligament was the main restraint against varus angulation and ulnocarpal subluxation?
In Candela Andrade 2026 et al., on feline carpal biomechanics, which angular and radiographic changes accompanied palmar radiocarpal ligament transection in the staged experiment?
In Candela Andrade 2026 et al., on feline carpal biomechanics, disruption of which structure was associated with approximately 12° additional extension and carpometacarpal instability?
Access the full library of surgical summaries and exam-style questions.
Educational content developed independently and supported by Simini.
The maker of Simini Protect Lavage.