Prenatal androgen exposure has important organising effects on brain development and influences future behavioural patterns. Second to fourth digit ratio (2D:4D) is a marker for prenatal androgen exposure and as such is a sexually dimorphic trait. Smaller, more masculine second digit (index finger) to fourth digit (ring finger) ratio’s are associated with higher exposure to prenatal testosterone levels or greater sensitivity to androgens, or both. People with smaller finger ratios, a longer fourth finger than second finger, have been shown to be more successful in competitive sports, exhibit increased visuo-spatial ability, more fertile and are perceived as being more masculine and dominant by female observers. Smaller ratios have also been associated with an increased propensity to engage in aggressive behaviour. We examined the relationship between Boxer’s fractures, a traditional injury of aggression and finger length ratio.

We reviewed 1123 patient records and/or hand x rays over a seven month time frame showing 123 fifth metacarpal (Boxer’s) fractures. We then measured, using recorded radiological data, the distance in millimetres from the base of the proximal phalanx to the tip of the distal phalanx for the second, third and fourth fingers. We also recorded sex, side of injury, site of injury and mode of injury.

One hundred and twenty three Boxer’s fractures were found over a seven month time period, 110 male and 13 female; 67.27% were right sided. The average age was 27.6 yrs ±14.2. The average finger length ratio (proximal phalanx to distal phalanx) for males was 0.9 and for females was 0.94. Both ratios were smaller than the published normal digit ratio for the general population.

Smaller second digit to fourth digit ratios are positively associated with persons presenting with fifth metacarpal fractures, thereby indicating increased aggressive tendancies independently of gender

Introduction: Finger length ratio (2d:4d) is a sexually dimorphic trait. Smaller, more masculine second digit (index finger) to fourth digit (ring finger) ratio’s are associated with higher exposure to prenatal testosterone levels or greater sensitivity to androgens, or both. People with smaller finger ratios are perceived as being more masculine and dominant by female observers. Smaller ratios have also been associated with an increased propensity to engage in aggressive behaviour. We examined the relationship between Boxer’s fractures, a traditional injury of aggression and finger length ratio.

Methods: We reviewed 1123 patient records and/or hand x-rays over a seven month time frame showing 123 fifth metacarpal (Boxer’s) fractures. We then measured, using recorded radiological data, the distance in millimetres from the base of the proximal phalanx to the tip of the distal phalanx for the second, third and fourth fingers. We also recorded sex, side of injury, site of injury and mode of injury.

Results: 123 Boxer’s fractures were found over a seven month time period, 110 male and 13 female. 67.27% were right sided. The average age was 27.6 yrs ±14.2. The average finger length ratio (proximal phalanx to distal phalanx) for males was 0.9 and for females was 0.94.

Conclusion: Smaller second digit to fourth digit ratios are positively associated with persons presenting with fifth metacarpal fractures, thereby indicating increased aggressive tendancies independently of gender.

Total Elbow arthroplasty can be a valuable treatment option in the painful or stiff elbow but outcomes have been disappointing previously. The history of total elbow arthroplasty has been disappointing in the past. Implants initially were a coupled articulation and were a rigid hinge. There was then a move to resurfacing type of designs although there was an issue with instability postoperatively with these implants. The semiconstrained coupled implant was developed in the mid 1970s by Coonrad. The idea behind the implant was that the loose polyethylene coupling provides inherent stability while decreasing the amount of loosening that was seen with the rigid hinge implants previously. We are reporting our results of our experience with a single type of semiconstrained implant that has been used in our unit since 1999.

A semiconstrained total elbow arthroplasty was performed in thirteen patients over a period of 7 years period in our unit. Mean age at time of surgery was 60 years (44–70) M:F ratio 11:2. The aetiology of the joint pathology was Rheumatoid Arthritis (n= 10), psoriatic arthritis (n= 2) & posttraumatic (n =1).

The patients were followed up for a mean duration of 4.5 years. They were assessed for range of motion, Mayo elbow function scores and radiographic evaluation and complication rate. 9 of the 13 elbows had a good to excellent result. There were 5 complications overall. There was two ulnar neuropathies that eventually resolved and one ulnar component that had to be revised 2 weeks after initial insertion. 3 had condylar fractures none of which required further operation. One patient had evidence of radiographic loosening but was asymptomatic.

In our experience the semiconstrained total elbow replacement is a valuable option in the treatment of painful stiff the elbow.

Introduction: Proximal humeral fractures are common in the elderly osteoporotic population. Surgical management of such fractures with traditional internal fixation techniques is often challenging due to poor bone quality. Fixation with intramedullary devices theoretically offers better fixation, but with increased risk of shoulder pain and decreased range of motion. We undertook a study to compare outcome following fixation of such fractures with either an intramedullary nail (Polarus), standard Clover Leaf plate (AO), or Philos Locking plate (AO).

Method: All patients admitted for surgical management of a proximal humeral fracture were entered into the study. 10 patients were treated using a Philos plate (Group 1), 5 with a Clover Leaf plate (Group 2), and 10 with a Polarus nail (Group 3). Post-operative assessment included radiological evaluation, clinical assessment of range of motion compared to the non-injured arm, assessment of pain severity (visual analogue scale), and functional assessment (DASH score). Non-parametric statistical techniques were used to analyse results.

Results: There was no significant difference in age or sex distribution between the three groups. (Mean ages: Group 1: 54.6 yrs, Group 2: 45.2 yrs, Group 3: 59.7 yrs) Mean patient follow-up was 22 months (range 5–52 months).

All patients in Group 1 and 2 went on to satisfactory radiological and clinical union. A higher complication rate was noted in the Polarus nail group, with 3 patients requiring removal of metal due to soft tissue or subacromial impingement. In addition one patient developed a non-union and required Philos plate fixation.

All groups demonstrated a significant decrease in shoulder range of motion following injury, however this was less marked in Group 1 (Philos plate). In addition, patients in group 1 (Philos plate) demonstrated a more rapid recovery in terms of severity of pain, functional impairment and range of motion in the early postoperative phase. However, no significant long-term difference was noted in terms of post-operative pain or functional deficit between group 1 and 2. The poor outcome in group 3 was associated with a high incidence of shoulder pain and secondary procedures.

Conclusion: Intramedullary fixation of proximal humeral fractures resulted in a high level of complications requiring secondary procedures in many cases. Our study supports the safety and efficacy of plate fixation techniques in the operative management of proximal humeral fractures.