Evaluation of grip strength in hook of hamate fractures treated with osteosynthesis. Is this surgical treatment necessary?

Objective: The aim of this study was to evaluate the outcomes of open reduction and internal fixation(ORIF) in hamate hook fractures and review the literature on this surgical procedure.Methods: We report the outcomes of ORIF of hamate hook fractures in 13 consecutive patients (12 menand 1 woman; mean age: 32 years (range, 22e48 years)). In eight patients (61%) the fracture wasassociated with ulnar nerve neuritis in Guyon's canal. We assessed the following clinical data: age, sex,mechanism of injury, side of the injured hand and associated lesions, fracture classification, average timefrom injury to correct diagnosis, surgical technique, complications, and length of follow-up.All patients underwent radiological imaging, including standard radiographs in two planes (anteroposterior and lateral projections), and a CT study. Functional outcomes evaluated were pain, range ofmotion, grip strength, Disabilities of the arm, shoulder and hand (DASH) and Mayo wrist score.Results: The mean follow-up was 36 months (range, 12e144 months). All 13 cases were treated withORIF of the hook of the hamate. Mean VAS pain score was 5 preoperatively (4e9) and 1 (0e2) postoperatively. All patients returned to pre-injury level and only one patient felt pain on activity. Preoperative modified Mayo wrist score was 51 and the postoperative value was 94. All outcomes scoresimproved significantly from preoperative values. The patients who participated in sports postoperativelywere able to do so at or near pre-injury levels. Postoperative average range of wrist motion was 76 inextension, 71 in flexion, 14 in ulnar deviation, and 21 in radial deviation.Mean grip strength in the hand with the hook fracture was 58 kg compared with 53 Kg in the unaffectedhand. All patients returned to their pre-injury level of functioning after 10e12 weeks and there were nocomplications. Analysis of grip strength revealed values comparable with the unaffected hand.Conclusion: ORIF of hamate hook fractures is a safe and effective technique to restore normal gripstrength and return to pre-injury level. In cases of ulnar nerve neuritis, neurolysis of the deep palmarbranch is mandatory.

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